Merge branch 'develop' of github.com:matrix-org/matrix-react-sdk into t3chguy/a11y/composer-list-autocomplete

 Conflicts:

	src/components/views/rooms/BasicMessageComposer.tsx

	src/editor/autocomplete.ts

src/components/structures/AutoHideScrollbar.tsx

@@ -61,7 +61,9 @@ export default class AutoHideScrollbar extends React.Component<IProps> {
             style={style}
             className={["mx_AutoHideScrollbar", className].join(" ")}
             onWheel={onWheel}
-            tabIndex={tabIndex}
+            // Firefox sometimes makes this element focusable due to
+            // overflow:scroll;, so force it out of tab order by default.
+            tabIndex={tabIndex ?? -1}
         >
             { children }
         </div>);

src/components/structures/CallEventGrouper.ts

@@ -0,0 +1,170 @@
+/*
+Copyright 2021 Šimon Brandner <simon.bra.ag@gmail.com>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { EventType } from "matrix-js-sdk/src/@types/event";
+import { MatrixEvent } from "matrix-js-sdk/src/models/event";
+import { CallEvent, CallState, CallType, MatrixCall } from "matrix-js-sdk/src/webrtc/call";
+import CallHandler, { CallHandlerEvent } from '../../CallHandler';
+import { EventEmitter } from 'events';
+import { MatrixClientPeg } from "../../MatrixClientPeg";
+import defaultDispatcher from "../../dispatcher/dispatcher";
+
+export enum CallEventGrouperEvent {
+    StateChanged = "state_changed",
+    SilencedChanged = "silenced_changed",
+}
+
+const CONNECTING_STATES = [
+    CallState.Connecting,
+    CallState.WaitLocalMedia,
+    CallState.CreateOffer,
+    CallState.CreateAnswer,
+];
+
+const SUPPORTED_STATES = [
+    CallState.Connected,
+    CallState.Ringing,
+];
+
+export enum CustomCallState {
+    Missed = "missed",
+}
+
+export default class CallEventGrouper extends EventEmitter {
+    private events: Set<MatrixEvent> = new Set<MatrixEvent>();
+    private call: MatrixCall;
+    public state: CallState | CustomCallState;
+
+    constructor() {
+        super();
+
+        CallHandler.sharedInstance().addListener(CallHandlerEvent.CallsChanged, this.setCall);
+        CallHandler.sharedInstance().addListener(CallHandlerEvent.SilencedCallsChanged, this.onSilencedCallsChanged);
+    }
+
+    private get invite(): MatrixEvent {
+        return [...this.events].find((event) => event.getType() === EventType.CallInvite);
+    }
+
+    private get hangup(): MatrixEvent {
+        return [...this.events].find((event) => event.getType() === EventType.CallHangup);
+    }
+
+    private get reject(): MatrixEvent {
+        return [...this.events].find((event) => event.getType() === EventType.CallReject);
+    }
+
+    private get selectAnswer(): MatrixEvent {
+        return [...this.events].find((event) => event.getType() === EventType.CallSelectAnswer);
+    }
+
+    public get isVoice(): boolean {
+        const invite = this.invite;
+        if (!invite) return;
+
+        // FIXME: Find a better way to determine this from the event?
+        if (invite.getContent()?.offer?.sdp?.indexOf('m=video') !== -1) return false;
+        return true;
+    }
+
+    public get hangupReason(): string | null {
+        return this.hangup?.getContent()?.reason;
+    }
+
+    public get rejectParty(): string {
+        return this.reject?.getSender();
+    }
+
+    public get gotRejected(): boolean {
+        return Boolean(this.reject);
+    }
+
+    public get duration(): Date {
+        if (!this.hangup || !this.selectAnswer) return;
+        return new Date(this.hangup.getDate().getTime() - this.selectAnswer.getDate().getTime());
+    }
+
+    /**
+     * Returns true if there are only events from the other side - we missed the call
+     */
+    private get callWasMissed(): boolean {
+        return ![...this.events].some((event) => event.sender?.userId === MatrixClientPeg.get().getUserId());
+    }
+
+    private get callId(): string {
+        return [...this.events][0].getContent().call_id;
+    }
+
+    private onSilencedCallsChanged = () => {
+        const newState = CallHandler.sharedInstance().isCallSilenced(this.callId);
+        this.emit(CallEventGrouperEvent.SilencedChanged, newState);
+    };
+
+    public answerCall = () => {
+        this.call?.answer();
+    };
+
+    public rejectCall = () => {
+        this.call?.reject();
+    };
+
+    public callBack = () => {
+        defaultDispatcher.dispatch({
+            action: 'place_call',
+            type: this.isVoice ? CallType.Voice : CallType.Video,
+            room_id: [...this.events][0]?.getRoomId(),
+        });
+    };
+
+    public toggleSilenced = () => {
+        const silenced = CallHandler.sharedInstance().isCallSilenced(this.callId);
+        silenced ?
+            CallHandler.sharedInstance().unSilenceCall(this.callId) :
+            CallHandler.sharedInstance().silenceCall(this.callId);
+    };
+
+    private setCallListeners() {
+        if (!this.call) return;
+        this.call.addListener(CallEvent.State, this.setState);
+    }
+
+    private setState = () => {
+        if (CONNECTING_STATES.includes(this.call?.state)) {
+            this.state = CallState.Connecting;
+        } else if (SUPPORTED_STATES.includes(this.call?.state)) {
+            this.state = this.call.state;
+        } else {
+            if (this.callWasMissed) this.state = CustomCallState.Missed;
+            else if (this.reject) this.state = CallState.Ended;
+            else if (this.hangup) this.state = CallState.Ended;
+            else if (this.invite && this.call) this.state = CallState.Connecting;
+        }
+        this.emit(CallEventGrouperEvent.StateChanged, this.state);
+    };
+
+    private setCall = () => {
+        if (this.call) return;
+
+        this.call = CallHandler.sharedInstance().getCallById(this.callId);
+        this.setCallListeners();
+        this.setState();
+    };
+
+    public add(event: MatrixEvent) {
+        this.events.add(event);
+        this.setCall();
+    }
+}

src/components/structures/ContextMenu.tsx

@@ -16,7 +16,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import React, { CSSProperties, RefObject, useRef, useState } from "react";
+import React, { CSSProperties, RefObject, SyntheticEvent, useRef, useState } from "react";
 import ReactDOM from "react-dom";
 import classNames from "classnames";
 
@@ -80,6 +80,10 @@ export interface IProps extends IPosition {
     managed?: boolean;
     wrapperClassName?: string;
 
+    // If true, this context menu will be mounted as a child to the parent container. Otherwise
+    // it will be mounted to a container at the root of the DOM.
+    mountAsChild?: boolean;
+
     // Function to be called on menu close
     onFinished();
     // on resize callback
@@ -390,7 +394,13 @@ export class ContextMenu extends React.PureComponent<IProps, IState> {
     }
 
     render(): React.ReactChild {
-        return ReactDOM.createPortal(this.renderMenu(), getOrCreateContainer());
+        if (this.props.mountAsChild) {
+            // Render as a child of the current parent
+            return this.renderMenu();
+        } else {
+            // Render as a child of a container at the root of the DOM
+            return ReactDOM.createPortal(this.renderMenu(), getOrCreateContainer());
+        }
     }
 }
 
@@ -461,10 +471,14 @@ type ContextMenuTuple<T> = [boolean, RefObject<T>, () => void, () => void, (val:
 export const useContextMenu = <T extends any = HTMLElement>(): ContextMenuTuple<T> => {
     const button = useRef<T>(null);
     const [isOpen, setIsOpen] = useState(false);
-    const open = () => {
+    const open = (ev?: SyntheticEvent) => {
+        ev?.preventDefault();
+        ev?.stopPropagation();
         setIsOpen(true);
     };
-    const close = () => {
+    const close = (ev?: SyntheticEvent) => {
+        ev?.preventDefault();
+        ev?.stopPropagation();
         setIsOpen(false);
     };
 

src/components/structures/CustomRoomTagPanel.js

@@ -56,7 +56,7 @@ class CustomRoomTagPanel extends React.Component {
         return (<div className={classes}>
             <div className="mx_CustomRoomTagPanel_divider" />
             <AutoHideScrollbar className="mx_CustomRoomTagPanel_scroller">
-                {tags}
+                { tags }
             </AutoHideScrollbar>
         </div>);
     }
@@ -84,7 +84,7 @@ class CustomRoomTagTile extends React.Component {
                 "mx_TagTile_badge": true,
                 "mx_TagTile_badgeHighlight": badgeNotifState.hasMentions,
             });
-            badgeElement = (<div className={badgeClasses}>{FormattingUtils.formatCount(badgeNotifState.count)}</div>);
+            badgeElement = (<div className={badgeClasses}>{ FormattingUtils.formatCount(badgeNotifState.count) }</div>);
         }
 
         return (

src/components/structures/EmbeddedPage.js

@@ -120,16 +120,15 @@ export default class EmbeddedPage extends React.PureComponent {
 
         const content = <div className={`${className}_body`}
             dangerouslySetInnerHTML={{ __html: this.state.page }}
-        >
-        </div>;
+        />;
 
         if (this.props.scrollbar) {
             return <AutoHideScrollbar className={classes}>
-                {content}
+                { content }
             </AutoHideScrollbar>;
         } else {
             return <div className={classes}>
-                {content}
+                { content }
             </div>;
         }
     }

src/components/structures/FilePanel.tsx

@@ -36,6 +36,7 @@ import ResizeNotifier from '../../utils/ResizeNotifier';
 import TimelinePanel from "./TimelinePanel";
 import Spinner from "../views/elements/Spinner";
 import { TileShape } from '../views/rooms/EventTile';
+import { Layout } from "../../settings/Layout";
 
 interface IProps {
     roomId: string;
@@ -241,8 +242,8 @@ class FilePanel extends React.Component<IProps, IState> {
         // wrap a TimelinePanel with the jump-to-event bits turned off.
 
         const emptyState = (<div className="mx_RightPanel_empty mx_FilePanel_empty">
-            <h2>{_t('No files visible in this room')}</h2>
-            <p>{_t('Attach files from chat or just drag and drop them anywhere in a room.')}</p>
+            <h2>{ _t('No files visible in this room') }</h2>
+            <p>{ _t('Attach files from chat or just drag and drop them anywhere in a room.') }</p>
         </div>);
 
         const isRoomEncrypted = this.noRoom ? false : MatrixClientPeg.get().isRoomEncrypted(this.props.roomId);
@@ -262,11 +263,12 @@ class FilePanel extends React.Component<IProps, IState> {
                         manageReadReceipts={false}
                         manageReadMarkers={false}
                         timelineSet={this.state.timelineSet}
-                        showUrlPreview = {false}
+                        showUrlPreview={false}
                         onPaginationRequest={this.onPaginationRequest}
                         tileShape={TileShape.FileGrid}
                         resizeNotifier={this.props.resizeNotifier}
                         empty={emptyState}
+                        layout={Layout.Group}
                     />
                 </BaseCard>
             );

src/components/structures/GenericErrorPage.js

@@ -28,8 +28,8 @@ export default class GenericErrorPage extends React.PureComponent {
     render() {
         return <div className='mx_GenericErrorPage'>
             <div className='mx_GenericErrorPage_box'>
-                <h1>{this.props.title}</h1>
-                <p>{this.props.message}</p>
+                <h1>{ this.props.title }</h1>
+                <p>{ this.props.message }</p>
             </div>
         </div>;
     }

src/components/structures/GroupView.js

@@ -222,7 +222,7 @@ class FeaturedRoom extends React.Component {
 
         let roomNameNode = null;
         if (permalink) {
-            roomNameNode = <a href={permalink} onClick={this.onClick} >{ roomName }</a>;
+            roomNameNode = <a href={permalink} onClick={this.onClick}>{ roomName }</a>;
         } else {
             roomNameNode = <span>{ roomName }</span>;
         }
@@ -819,12 +819,12 @@ export default class GroupView extends React.Component {
         let hostingSignup = null;
         if (hostingSignupLink && this.state.isUserPrivileged) {
             hostingSignup = <div className="mx_GroupView_hostingSignup">
-                {_t(
+                { _t(
                     "Want more than a community? <a>Get your own server</a>", {},
                     {
-                        a: sub => <a href={hostingSignupLink} target="_blank" rel="noreferrer noopener">{sub}</a>,
+                        a: sub => <a href={hostingSignupLink} target="_blank" rel="noreferrer noopener">{ sub }</a>,
                     },
-                )}
+                ) }
                 <a href={hostingSignupLink} target="_blank" rel="noreferrer noopener">
                     <img src={require("../../../res/img/external-link.svg")} width="11" height="10" alt='' />
                 </a>
@@ -1185,10 +1185,13 @@ export default class GroupView extends React.Component {
                     avatarImage = <Spinner />;
                 } else {
                     const GroupAvatar = sdk.getComponent('avatars.GroupAvatar');
-                    avatarImage = <GroupAvatar groupId={this.props.groupId}
+                    avatarImage = <GroupAvatar
+                        groupId={this.props.groupId}
                         groupName={this.state.profileForm.name}
                         groupAvatarUrl={this.state.profileForm.avatar_url}
-                        width={28} height={28} resizeMethod='crop'
+                        width={28}
+                        height={28}
+                        resizeMethod='crop'
                     />;
                 }
 
@@ -1199,9 +1202,12 @@ export default class GroupView extends React.Component {
                         </label>
                         <div className="mx_GroupView_avatarPicker_edit">
                             <label htmlFor="avatarInput" className="mx_GroupView_avatarPicker_label">
-                                <img src={require("../../../res/img/camera.svg")}
-                                    alt={_t("Upload avatar")} title={_t("Upload avatar")}
-                                    width="17" height="15" />
+                                <img
+                                    src={require("../../../res/img/camera.svg")}
+                                    alt={_t("Upload avatar")}
+                                    title={_t("Upload avatar")}
+                                    width="17"
+                                    height="15" />
                             </label>
                             <input id="avatarInput" className="mx_GroupView_uploadInput" type="file" onChange={this._onAvatarSelected} />
                         </div>
@@ -1238,7 +1244,8 @@ export default class GroupView extends React.Component {
                     groupAvatarUrl={groupAvatarUrl}
                     groupName={groupName}
                     onClick={onGroupHeaderItemClick}
-                    width={28} height={28}
+                    width={28}
+                    height={28}
                 />;
                 if (summary.profile && summary.profile.name) {
                     nameNode = <div onClick={onGroupHeaderItemClick}>
@@ -1269,28 +1276,32 @@ export default class GroupView extends React.Component {
                         key="_cancelButton"
                         onClick={this._onCancelClick}
                     >
-                        <img src={require("../../../res/img/cancel.svg")} className="mx_filterFlipColor"
-                            width="18" height="18" alt={_t("Cancel")} />
+                        <img
+                            src={require("../../../res/img/cancel.svg")}
+                            className="mx_filterFlipColor"
+                            width="18"
+                            height="18"
+                            alt={_t("Cancel")} />
                     </AccessibleButton>,
                 );
             } else {
                 if (summary.user && summary.user.membership === 'join') {
                     rightButtons.push(
-                        <AccessibleButton className="mx_GroupHeader_button mx_GroupHeader_editButton"
+                        <AccessibleButton
+                            className="mx_GroupHeader_button mx_GroupHeader_editButton"
                             key="_editButton"
                             onClick={this._onEditClick}
                             title={_t("Community Settings")}
-                        >
-                        </AccessibleButton>,
+                        />,
                     );
                 }
                 rightButtons.push(
-                    <AccessibleButton className="mx_GroupHeader_button mx_GroupHeader_shareButton"
+                    <AccessibleButton
+                        className="mx_GroupHeader_button mx_GroupHeader_shareButton"
                         key="_shareButton"
                         onClick={this._onShareClick}
                         title={_t('Share Community')}
-                    >
-                    </AccessibleButton>,
+                    />,
                 );
             }
 

src/components/structures/LeftPanel.tsx

@@ -392,9 +392,6 @@ export default class LeftPanel extends React.Component<IProps, IState> {
                 <IndicatorScrollbar
                     className="mx_LeftPanel_breadcrumbsContainer mx_AutoHideScrollbar"
                     verticalScrollsHorizontally={true}
-                    // Firefox sometimes makes this element focusable due to
-                    // overflow:scroll;, so force it out of tab order.
-                    tabIndex={-1}
                 >
                     <RoomBreadcrumbs />
                 </IndicatorScrollbar>
@@ -429,7 +426,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
                     onSelectRoom={this.selectRoom}
                 />
 
-                {dialPadButton}
+                { dialPadButton }
 
                 <AccessibleTooltipButton
                     className={classNames("mx_LeftPanel_exploreButton", {
@@ -448,7 +445,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
             leftLeftPanel = (
                 <div className="mx_LeftPanel_GroupFilterPanelContainer">
                     <GroupFilterPanel />
-                    {SettingsStore.getValue("feature_custom_tags") ? <CustomRoomTagPanel /> : null}
+                    { SettingsStore.getValue("feature_custom_tags") ? <CustomRoomTagPanel /> : null }
                 </div>
             );
         }
@@ -476,11 +473,11 @@ export default class LeftPanel extends React.Component<IProps, IState> {
 
         return (
             <div className={containerClasses} ref={this.ref}>
-                {leftLeftPanel}
+                { leftLeftPanel }
                 <aside className="mx_LeftPanel_roomListContainer">
-                    {this.renderHeader()}
-                    {this.renderSearchDialExplore()}
-                    {this.renderBreadcrumbs()}
+                    { this.renderHeader() }
+                    { this.renderSearchDialExplore() }
+                    { this.renderBreadcrumbs() }
                     <RoomListNumResults onVisibilityChange={this.refreshStickyHeaders} />
                     <div className="mx_LeftPanel_roomListWrapper">
                         <div
@@ -490,7 +487,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
                             // overflow:scroll;, so force it out of tab order.
                             tabIndex={-1}
                         >
-                            {roomList}
+                            { roomList }
                         </div>
                     </div>
                     { !this.props.isMinimized && <LeftPanelWidget /> }

src/components/structures/LeftPanelWidget.tsx

@@ -125,15 +125,15 @@ const LeftPanelWidget: React.FC = () => {
                     <span>{ WidgetUtils.getWidgetName(app) }</span>
                 </AccessibleButton>
 
-                {/* Code for the maximise button for once we have full screen widgets */}
-                {/*<AccessibleTooltipButton
+                { /* Code for the maximise button for once we have full screen widgets */ }
+                { /*<AccessibleTooltipButton
                     tabIndex={tabIndex}
                     onClick={() => {
                     }}
                     className="mx_LeftPanelWidget_maximizeButton"
                     tooltipClassName="mx_LeftPanelWidget_maximizeButtonTooltip"
                     title={_t("Maximize")}
-                />*/}
+                />*/ }
             </div>
         </div>
 

src/components/structures/LoggedInView.tsx

@@ -17,8 +17,8 @@ limitations under the License.
 */
 
 import * as React from 'react';
-import * as PropTypes from 'prop-types';
 import { MatrixClient } from 'matrix-js-sdk/src/client';
+import { MatrixEvent } from 'matrix-js-sdk/src/models/event';
 
 import { Key } from '../../Keyboard';
 import PageTypes from '../../PageTypes';
@@ -63,6 +63,7 @@ import ToastContainer from './ToastContainer';
 import MyGroups from "./MyGroups";
 import UserView from "./UserView";
 import GroupView from "./GroupView";
+import SpaceStore from "../../stores/SpaceStore";
 
 // We need to fetch each pinned message individually (if we don't already have it)
 // so each pinned message may trigger a request. Limit the number per room for sanity.
@@ -78,6 +79,8 @@ function canElementReceiveInput(el) {
 
 interface IProps {
     matrixClient: MatrixClient;
+    // Called with the credentials of a registered user (if they were a ROU that
+    // transitioned to PWLU)
     onRegistered: (credentials: IMatrixClientCreds) => Promise<MatrixClient>;
     hideToSRUsers: boolean;
     resizeNotifier: ResizeNotifier;
@@ -139,18 +142,6 @@ interface IState {
 class LoggedInView extends React.Component<IProps, IState> {
     static displayName = 'LoggedInView';
 
-    static propTypes = {
-        matrixClient: PropTypes.instanceOf(MatrixClient).isRequired,
-        page_type: PropTypes.string.isRequired,
-        onRoomCreated: PropTypes.func,
-
-        // Called with the credentials of a registered user (if they were a ROU that
-        // transitioned to PWLU)
-        onRegistered: PropTypes.func,
-
-        // and lots and lots of other stuff.
-    };
-
     protected readonly _matrixClient: MatrixClient;
     protected readonly _roomView: React.RefObject<any>;
     protected readonly _resizeContainer: React.RefObject<ResizeHandle>;
@@ -180,10 +171,10 @@ class LoggedInView extends React.Component<IProps, IState> {
     }
 
     componentDidMount() {
-        document.addEventListener('keydown', this._onNativeKeyDown, false);
+        document.addEventListener('keydown', this.onNativeKeyDown, false);
         CallHandler.sharedInstance().addListener(CallHandlerEvent.CallsChanged, this.onCallsChanged);
 
-        this._updateServerNoticeEvents();
+        this.updateServerNoticeEvents();
 
         this._matrixClient.on("accountData", this.onAccountData);
         this._matrixClient.on("sync", this.onSync);
@@ -199,13 +190,13 @@ class LoggedInView extends React.Component<IProps, IState> {
             "useCompactLayout", null, this.onCompactLayoutChanged,
         );
 
-        this.resizer = this._createResizer();
+        this.resizer = this.createResizer();
         this.resizer.attach();
-        this._loadResizerPreferences();
+        this.loadResizerPreferences();
     }
 
     componentWillUnmount() {
-        document.removeEventListener('keydown', this._onNativeKeyDown, false);
+        document.removeEventListener('keydown', this.onNativeKeyDown, false);
         CallHandler.sharedInstance().removeListener(CallHandlerEvent.CallsChanged, this.onCallsChanged);
         this._matrixClient.removeListener("accountData", this.onAccountData);
         this._matrixClient.removeListener("sync", this.onSync);
@@ -220,37 +211,37 @@ class LoggedInView extends React.Component<IProps, IState> {
         });
     };
 
-    canResetTimelineInRoom = (roomId) => {
+    public canResetTimelineInRoom = (roomId: string) => {
         if (!this._roomView.current) {
             return true;
         }
         return this._roomView.current.canResetTimeline();
     };
 
-    _createResizer() {
-        let size;
-        let collapsed;
+    private createResizer() {
+        let panelSize;
+        let panelCollapsed;
         const collapseConfig: ICollapseConfig = {
             // TODO decrease this once Spaces launches as it'll no longer need to include the 56px Community Panel
             toggleSize: 206 - 50,
-            onCollapsed: (_collapsed) => {
-                collapsed = _collapsed;
-                if (_collapsed) {
+            onCollapsed: (collapsed) => {
+                panelCollapsed = collapsed;
+                if (collapsed) {
                     dis.dispatch({ action: "hide_left_panel" });
                     window.localStorage.setItem("mx_lhs_size", '0');
                 } else {
                     dis.dispatch({ action: "show_left_panel" });
                 }
             },
-            onResized: (_size) => {
-                size = _size;
+            onResized: (size) => {
+                panelSize = size;
                 this.props.resizeNotifier.notifyLeftHandleResized();
             },
             onResizeStart: () => {
                 this.props.resizeNotifier.startResizing();
             },
             onResizeStop: () => {
-                if (!collapsed) window.localStorage.setItem("mx_lhs_size", '' + size);
+                if (!panelCollapsed) window.localStorage.setItem("mx_lhs_size", '' + panelSize);
                 this.props.resizeNotifier.stopResizing();
             },
             isItemCollapsed: domNode => {
@@ -266,7 +257,7 @@ class LoggedInView extends React.Component<IProps, IState> {
         return resizer;
     }
 
-    _loadResizerPreferences() {
+    private loadResizerPreferences() {
         let lhsSize = parseInt(window.localStorage.getItem("mx_lhs_size"), 10);
         if (isNaN(lhsSize)) {
             lhsSize = 350;
@@ -274,7 +265,7 @@ class LoggedInView extends React.Component<IProps, IState> {
         this.resizer.forHandleAt(0).resize(lhsSize);
     }
 
-    onAccountData = (event) => {
+    private onAccountData = (event: MatrixEvent) => {
         if (event.getType() === "m.ignored_user_list") {
             dis.dispatch({ action: "ignore_state_changed" });
         }
@@ -306,16 +297,16 @@ class LoggedInView extends React.Component<IProps, IState> {
         }
 
         if (oldSyncState === 'PREPARED' && syncState === 'SYNCING') {
-            this._updateServerNoticeEvents();
+            this.updateServerNoticeEvents();
         } else {
-            this._calculateServerLimitToast(this.state.syncErrorData, this.state.usageLimitEventContent);
+            this.calculateServerLimitToast(this.state.syncErrorData, this.state.usageLimitEventContent);
         }
     };
 
     onRoomStateEvents = (ev, state) => {
         const serverNoticeList = RoomListStore.instance.orderedLists[DefaultTagID.ServerNotice];
         if (serverNoticeList && serverNoticeList.some(r => r.roomId === ev.getRoomId())) {
-            this._updateServerNoticeEvents();
+            this.updateServerNoticeEvents();
         }
     };
 
@@ -325,7 +316,7 @@ class LoggedInView extends React.Component<IProps, IState> {
         });
     };
 
-    _calculateServerLimitToast(syncError: IState["syncErrorData"], usageLimitEventContent?: IUsageLimit) {
+    private calculateServerLimitToast(syncError: IState["syncErrorData"], usageLimitEventContent?: IUsageLimit) {
         const error = syncError && syncError.error && syncError.error.errcode === "M_RESOURCE_LIMIT_EXCEEDED";
         if (error) {
             usageLimitEventContent = syncError.error.data;
@@ -345,7 +336,7 @@ class LoggedInView extends React.Component<IProps, IState> {
         }
     }
 
-    _updateServerNoticeEvents = async () => {
+    private updateServerNoticeEvents = async () => {
         const serverNoticeList = RoomListStore.instance.orderedLists[DefaultTagID.ServerNotice];
         if (!serverNoticeList) return [];
 
@@ -377,7 +368,7 @@ class LoggedInView extends React.Component<IProps, IState> {
             );
         });
         const usageLimitEventContent = usageLimitEvent && usageLimitEvent.getContent();
-        this._calculateServerLimitToast(this.state.syncErrorData, usageLimitEventContent);
+        this.calculateServerLimitToast(this.state.syncErrorData, usageLimitEventContent);
         this.setState({
             usageLimitEventContent,
             usageLimitEventTs: pinnedEventTs,
@@ -386,7 +377,7 @@ class LoggedInView extends React.Component<IProps, IState> {
         });
     };
 
-    _onPaste = (ev) => {
+    private onPaste = (ev) => {
         let canReceiveInput = false;
         let element = ev.target;
         // test for all parents because the target can be a child of a contenteditable element
@@ -424,22 +415,22 @@ class LoggedInView extends React.Component<IProps, IState> {
     We also listen with a native listener on the document to get keydown events when no element is focused.
     Bubbling is irrelevant here as the target is the body element.
     */
-    _onReactKeyDown = (ev) => {
+    private onReactKeyDown = (ev) => {
         // events caught while bubbling up on the root element
         // of this component, so something must be focused.
-        this._onKeyDown(ev);
+        this.onKeyDown(ev);
     };
 
-    _onNativeKeyDown = (ev) => {
+    private onNativeKeyDown = (ev) => {
         // only pass this if there is no focused element.
-        // if there is, _onKeyDown will be called by the
+        // if there is, onKeyDown will be called by the
         // react keydown handler that respects the react bubbling order.
         if (ev.target === document.body) {
-            this._onKeyDown(ev);
+            this.onKeyDown(ev);
         }
     };
 
-    _onKeyDown = (ev) => {
+    private onKeyDown = (ev) => {
         let handled = false;
 
         const roomAction = getKeyBindingsManager().getRoomAction(ev);
@@ -449,7 +440,7 @@ class LoggedInView extends React.Component<IProps, IState> {
             case RoomAction.JumpToFirstMessage:
             case RoomAction.JumpToLatestMessage:
                 // pass the event down to the scroll panel
-                this._onScrollKeyPressed(ev);
+                this.onScrollKeyPressed(ev);
                 handled = true;
                 break;
             case RoomAction.FocusSearch:
@@ -564,7 +555,7 @@ class LoggedInView extends React.Component<IProps, IState> {
      * dispatch a page-up/page-down/etc to the appropriate component
      * @param {Object} ev The key event
      */
-    _onScrollKeyPressed = (ev) => {
+    private onScrollKeyPressed = (ev) => {
         if (this._roomView.current) {
             this._roomView.current.handleScrollKey(ev);
         }
@@ -624,14 +615,14 @@ class LoggedInView extends React.Component<IProps, IState> {
         return (
             <MatrixClientContext.Provider value={this._matrixClient}>
                 <div
-                    onPaste={this._onPaste}
-                    onKeyDown={this._onReactKeyDown}
+                    onPaste={this.onPaste}
+                    onKeyDown={this.onReactKeyDown}
                     className='mx_MatrixChat_wrapper'
                     aria-hidden={this.props.hideToSRUsers}
                 >
                     <ToastContainer />
                     <div ref={this._resizeContainer} className={bodyClasses}>
-                        { SettingsStore.getValue("feature_spaces") ? <SpacePanel /> : null }
+                        { SpaceStore.spacesEnabled ? <SpacePanel /> : null }
                         <LeftPanel
                             isMinimized={this.props.collapseLhs || false}
                             resizeNotifier={this.props.resizeNotifier}
@@ -643,7 +634,7 @@ class LoggedInView extends React.Component<IProps, IState> {
                 <CallContainer />
                 <NonUrgentToastContainer />
                 <HostSignupContainer />
-                {audioFeedArraysForCalls}
+                { audioFeedArraysForCalls }
             </MatrixClientContext.Provider>
         );
     }

src/components/structures/MatrixChat.tsx

@@ -19,7 +19,7 @@ import { createClient } from "matrix-js-sdk/src/matrix";
 import { InvalidStoreError } from "matrix-js-sdk/src/errors";
 import { RoomMember } from "matrix-js-sdk/src/models/room-member";
 import { MatrixEvent } from "matrix-js-sdk/src/models/event";
-import { sleep, defer, IDeferred } from "matrix-js-sdk/src/utils";
+import { sleep, defer, IDeferred, QueryDict } from "matrix-js-sdk/src/utils";
 
 // focus-visible is a Polyfill for the :focus-visible CSS pseudo-attribute used by _AccessibleButton.scss
 import 'focus-visible';
@@ -105,6 +105,9 @@ import VerificationRequestToast from '../views/toasts/VerificationRequestToast';
 import PerformanceMonitor, { PerformanceEntryNames } from "../../performance";
 import UIStore, { UI_EVENTS } from "../../stores/UIStore";
 import SoftLogout from './auth/SoftLogout';
+import { makeRoomPermalink } from "../../utils/permalinks/Permalinks";
+import { copyPlaintext } from "../../utils/strings";
+import { PosthogAnalytics } from '../../PosthogAnalytics';
 
 /** constants for MatrixChat.state.view */
 export enum Views {
@@ -153,7 +156,7 @@ const ONBOARDING_FLOW_STARTERS = [
 
 interface IScreen {
     screen: string;
-    params?: object;
+    params?: QueryDict;
 }
 
 /* eslint-disable camelcase */
@@ -183,9 +186,9 @@ interface IProps { // TODO type things better
     onNewScreen: (screen: string, replaceLast: boolean) => void;
     enableGuest?: boolean;
     // the queryParams extracted from the [real] query-string of the URI
-    realQueryParams?: Record<string, string>;
+    realQueryParams?: QueryDict;
     // the initial queryParams extracted from the hash-fragment of the URI
-    startingFragmentQueryParams?: Record<string, string>;
+    startingFragmentQueryParams?: QueryDict;
     // called when we have completed a token login
     onTokenLoginCompleted?: () => void;
     // Represents the screen to display as a result of parsing the initial window.location
@@ -193,7 +196,7 @@ interface IProps { // TODO type things better
     // displayname, if any, to set on the device when logging in/registering.
     defaultDeviceDisplayName?: string;
     // A function that makes a registration URL
-    makeRegistrationUrl: (object) => string;
+    makeRegistrationUrl: (params: QueryDict) => string;
 }
 
 interface IState {
@@ -296,7 +299,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
             if (this.screenAfterLogin.screen.startsWith("room/") && params['signurl'] && params['email']) {
                 // probably a threepid invite - try to store it
                 const roomId = this.screenAfterLogin.screen.substring("room/".length);
-                ThreepidInviteStore.instance.storeInvite(roomId, params as IThreepidInviteWireFormat);
+                ThreepidInviteStore.instance.storeInvite(roomId, params as unknown as IThreepidInviteWireFormat);
             }
         }
 
@@ -385,6 +388,10 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
         if (SettingsStore.getValue("analyticsOptIn")) {
             Analytics.enable();
         }
+
+        PosthogAnalytics.instance.updateAnonymityFromSettings();
+        PosthogAnalytics.instance.updatePlatformSuperProperties();
+
         CountlyAnalytics.instance.enable(/* anonymous = */ true);
     }
 
@@ -429,7 +436,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
     }
 
     // TODO: [REACT-WARNING] Replace with appropriate lifecycle stage
-    // eslint-disable-next-line camelcase
+    // eslint-disable-next-line
     UNSAFE_componentWillUpdate(props, state) {
         if (this.shouldTrackPageChange(this.state, state)) {
             this.startPageChangeTimer();
@@ -441,6 +448,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
             const durationMs = this.stopPageChangeTimer();
             Analytics.trackPageChange(durationMs);
             CountlyAnalytics.instance.trackPageChange(durationMs);
+            PosthogAnalytics.instance.trackPageView(durationMs);
         }
         if (this.focusComposer) {
             dis.fire(Action.FocusSendMessageComposer);
@@ -627,6 +635,9 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
             case 'forget_room':
                 this.forgetRoom(payload.room_id);
                 break;
+            case 'copy_room':
+                this.copyRoom(payload.room_id);
+                break;
             case 'reject_invite':
                 Modal.createTrackedDialog('Reject invitation', '', QuestionDialog, {
                     title: _t('Reject invitation'),
@@ -1099,7 +1110,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
 
     private leaveRoomWarnings(roomId: string) {
         const roomToLeave = MatrixClientPeg.get().getRoom(roomId);
-        const isSpace = SettingsStore.getValue("feature_spaces") && roomToLeave?.isSpaceRoom();
+        const isSpace = SpaceStore.spacesEnabled && roomToLeave?.isSpaceRoom();
         // Show a warning if there are additional complications.
         const warnings = [];
 
@@ -1107,7 +1118,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
         if (memberCount === 1) {
             warnings.push((
                 <span className="warning" key="only_member_warning">
-                    {' '/* Whitespace, otherwise the sentences get smashed together */ }
+                    { ' '/* Whitespace, otherwise the sentences get smashed together */ }
                     { _t("You are the only person here. " +
                         "If you leave, no one will be able to join in the future, including you.") }
                 </span>
@@ -1122,7 +1133,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
             if (rule !== "public") {
                 warnings.push((
                     <span className="warning" key="non_public_warning">
-                        {' '/* Whitespace, otherwise the sentences get smashed together */ }
+                        { ' '/* Whitespace, otherwise the sentences get smashed together */ }
                         { isSpace
                             ? _t("This space is not public. You will not be able to rejoin without an invite.")
                             : _t("This room is not public. You will not be able to rejoin without an invite.") }
@@ -1137,7 +1148,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
         const roomToLeave = MatrixClientPeg.get().getRoom(roomId);
         const warnings = this.leaveRoomWarnings(roomId);
 
-        const isSpace = SettingsStore.getValue("feature_spaces") && roomToLeave?.isSpaceRoom();
+        const isSpace = SpaceStore.spacesEnabled && roomToLeave?.isSpaceRoom();
         Modal.createTrackedDialog(isSpace ? "Leave space" : "Leave room", '', QuestionDialog, {
             title: isSpace ? _t("Leave space") : _t("Leave room"),
             description: (
@@ -1150,7 +1161,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                         : _t(
                             "Are you sure you want to leave the room '%(roomName)s'?",
                             { roomName: roomToLeave.name },
-                        )}
+                        ) }
                     { warnings }
                 </span>
             ),
@@ -1193,6 +1204,17 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
         });
     }
 
+    private async copyRoom(roomId: string) {
+        const roomLink = makeRoomPermalink(roomId);
+        const success = await copyPlaintext(roomLink);
+        if (!success) {
+            Modal.createTrackedDialog("Unable to copy room link", "", ErrorDialog, {
+                title: _t("Unable to copy room link"),
+                description: _t("Unable to copy a link to the room to the clipboard."),
+            });
+        }
+    }
+
     /**
      * Starts a chat with the welcome user, if the user doesn't already have one
      * @returns {string} The room ID of the new room, or null if no room was created
@@ -1687,7 +1709,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
             const type = screen === "start_sso" ? "sso" : "cas";
             PlatformPeg.get().startSingleSignOn(cli, type, this.getFragmentAfterLogin());
         } else if (screen === 'groups') {
-            if (SettingsStore.getValue("feature_spaces")) {
+            if (SpaceStore.spacesEnabled) {
                 dis.dispatch({ action: "view_home_page" });
                 return;
             }
@@ -1774,7 +1796,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                 subAction: params.action,
             });
         } else if (screen.indexOf('group/') === 0) {
-            if (SettingsStore.getValue("feature_spaces")) {
+            if (SpaceStore.spacesEnabled) {
                 dis.dispatch({ action: "view_home_page" });
                 return;
             }
@@ -1848,13 +1870,6 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
         dis.dispatch({ action: 'timeline_resize' });
     }
 
-    onRoomCreated(roomId: string) {
-        dis.dispatch({
-            action: "view_room",
-            room_id: roomId,
-        });
-    }
-
     onRegisterClick = () => {
         this.showScreen("register");
     };
@@ -1936,7 +1951,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
         this.setState({ serverConfig });
     };
 
-    private makeRegistrationUrl = (params: {[key: string]: string}) => {
+    private makeRegistrationUrl = (params: QueryDict) => {
         if (this.props.startingFragmentQueryParams.referrer) {
             params.referrer = this.props.startingFragmentQueryParams.referrer;
         }
@@ -2027,7 +2042,6 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                         {...this.state}
                         ref={this.loggedInView}
                         matrixClient={MatrixClientPeg.get()}
-                        onRoomCreated={this.onRoomCreated}
                         onRegistered={this.onRegistered}
                         currentRoomId={this.state.currentRoomId}
                     />
@@ -2037,15 +2051,15 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                 let errorBox;
                 if (this.state.syncError && !isStoreError) {
                     errorBox = <div className="mx_MatrixChat_syncError">
-                        {messageForSyncError(this.state.syncError)}
+                        { messageForSyncError(this.state.syncError) }
                     </div>;
                 }
                 view = (
                     <div className="mx_MatrixChat_splash">
-                        {errorBox}
+                        { errorBox }
                         <Spinner />
                         <a href="#" className="mx_MatrixChat_splashButtons" onClick={this.onLogoutClick}>
-                            {_t('Logout')}
+                            { _t('Logout') }
                         </a>
                     </div>
                 );
@@ -2091,7 +2105,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                     onForgotPasswordClick={showPasswordReset ? this.onForgotPasswordClick : undefined}
                     onServerConfigChange={this.onServerConfigChange}
                     fragmentAfterLogin={fragmentAfterLogin}
-                    defaultUsername={this.props.startingFragmentQueryParams.defaultUsername}
+                    defaultUsername={this.props.startingFragmentQueryParams.defaultUsername as string}
                     {...this.getServerProperties()}
                 />
             );
@@ -2108,7 +2122,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
         }
 
         return <ErrorBoundary>
-            {view}
+            { view }
         </ErrorBoundary>;
     }
 }

src/components/structures/MessagePanel.tsx

@@ -36,6 +36,7 @@ import DMRoomMap from "../../utils/DMRoomMap";
 import NewRoomIntro from "../views/rooms/NewRoomIntro";
 import { replaceableComponent } from "../../utils/replaceableComponent";
 import defaultDispatcher from '../../dispatcher/dispatcher';
+import CallEventGrouper from "./CallEventGrouper";
 import WhoIsTypingTile from '../views/rooms/WhoIsTypingTile';
 import ScrollPanel, { IScrollState } from "./ScrollPanel";
 import EventListSummary from '../views/elements/EventListSummary';
@@ -50,11 +51,20 @@ import EditorStateTransfer from "../../utils/EditorStateTransfer";
 
 const CONTINUATION_MAX_INTERVAL = 5 * 60 * 1000; // 5 minutes
 const continuedTypes = [EventType.Sticker, EventType.RoomMessage];
-const membershipTypes = [EventType.RoomMember, EventType.RoomThirdPartyInvite, EventType.RoomServerAcl];
+const groupedEvents = [
+    EventType.RoomMember,
+    EventType.RoomThirdPartyInvite,
+    EventType.RoomServerAcl,
+    EventType.RoomPinnedEvents,
+];
 
 // check if there is a previous event and it has the same sender as this event
 // and the types are the same/is in continuedTypes and the time between them is <= CONTINUATION_MAX_INTERVAL
-function shouldFormContinuation(prevEvent: MatrixEvent, mxEvent: MatrixEvent): boolean {
+function shouldFormContinuation(
+    prevEvent: MatrixEvent,
+    mxEvent: MatrixEvent,
+    showHiddenEvents: boolean,
+): boolean {
     // sanity check inputs
     if (!prevEvent || !prevEvent.sender || !mxEvent.sender) return false;
     // check if within the max continuation period
@@ -74,7 +84,7 @@ function shouldFormContinuation(prevEvent: MatrixEvent, mxEvent: MatrixEvent): b
         mxEvent.sender.getMxcAvatarUrl() !== prevEvent.sender.getMxcAvatarUrl()) return false;
 
     // if we don't have tile for previous event then it was shown by showHiddenEvents and has no SenderProfile
-    if (!haveTileForEvent(prevEvent)) return false;
+    if (!haveTileForEvent(prevEvent, showHiddenEvents)) return false;
 
     return true;
 }
@@ -228,6 +238,11 @@ export default class MessagePanel extends React.Component<IProps, IState> {
     private readonly showTypingNotificationsWatcherRef: string;
     private eventNodes: Record<string, HTMLElement>;
 
+    // A map of <callId, CallEventGrouper>
+    private callEventGroupers = new Map<string, CallEventGrouper>();
+
+    private membersCount = 0;
+
     constructor(props, context) {
         super(props, context);
 
@@ -239,7 +254,8 @@ export default class MessagePanel extends React.Component<IProps, IState> {
         };
 
         // Cache hidden events setting on mount since Settings is expensive to
-        // query, and we check this in a hot code path.
+        // query, and we check this in a hot code path. This is also cached in
+        // our RoomContext, however we still need a fallback for roomless MessagePanels.
         this.showHiddenEventsInTimeline = SettingsStore.getValue("showHiddenEventsInTimeline");
 
         this.showTypingNotificationsWatcherRef =
@@ -247,11 +263,14 @@ export default class MessagePanel extends React.Component<IProps, IState> {
     }
 
     componentDidMount() {
+        this.calculateRoomMembersCount();
+        this.props.room?.on("RoomState.members", this.calculateRoomMembersCount);
         this.isMounted = true;
     }
 
     componentWillUnmount() {
         this.isMounted = false;
+        this.props.room?.off("RoomState.members", this.calculateRoomMembersCount);
         SettingsStore.unwatchSetting(this.showTypingNotificationsWatcherRef);
     }
 
@@ -265,6 +284,10 @@ export default class MessagePanel extends React.Component<IProps, IState> {
         }
     }
 
+    private calculateRoomMembersCount = (): void => {
+        this.membersCount = this.props.room?.getMembers().length || 0;
+    };
+
     private onShowTypingNotificationsChange = (): void => {
         this.setState({
             showTypingNotifications: SettingsStore.getValue("showTypingNotifications"),
@@ -399,17 +422,21 @@ export default class MessagePanel extends React.Component<IProps, IState> {
         return !this.isMounted;
     };
 
+    private get showHiddenEvents(): boolean {
+        return this.context?.showHiddenEventsInTimeline ?? this.showHiddenEventsInTimeline;
+    }
+
     // TODO: Implement granular (per-room) hide options
     public shouldShowEvent(mxEv: MatrixEvent): boolean {
-        if (mxEv.sender && MatrixClientPeg.get().isUserIgnored(mxEv.sender.userId)) {
+        if (MatrixClientPeg.get().isUserIgnored(mxEv.getSender())) {
             return false; // ignored = no show (only happens if the ignore happens after an event was received)
         }
 
-        if (this.showHiddenEventsInTimeline) {
+        if (this.showHiddenEvents) {
             return true;
         }
 
-        if (!haveTileForEvent(mxEv)) {
+        if (!haveTileForEvent(mxEv, this.showHiddenEvents)) {
             return false; // no tile = no show
         }
 
@@ -567,9 +594,23 @@ export default class MessagePanel extends React.Component<IProps, IState> {
             const last = (mxEv === lastShownEvent);
             const { nextEvent, nextTile } = this.getNextEventInfo(this.props.events, i);
 
+            if (
+                mxEv.getType().indexOf("m.call.") === 0 ||
+                mxEv.getType().indexOf("org.matrix.call.") === 0
+            ) {
+                const callId = mxEv.getContent().call_id;
+                if (this.callEventGroupers.has(callId)) {
+                    this.callEventGroupers.get(callId).add(mxEv);
+                } else {
+                    const callEventGrouper = new CallEventGrouper();
+                    callEventGrouper.add(mxEv);
+                    this.callEventGroupers.set(callId, callEventGrouper);
+                }
+            }
+
             if (grouper) {
                 if (grouper.shouldGroup(mxEv)) {
-                    grouper.add(mxEv);
+                    grouper.add(mxEv, this.showHiddenEvents);
                     continue;
                 } else {
                     // not part of group, so get the group tiles, close the
@@ -582,7 +623,15 @@ export default class MessagePanel extends React.Component<IProps, IState> {
 
             for (const Grouper of groupers) {
                 if (Grouper.canStartGroup(this, mxEv)) {
-                    grouper = new Grouper(this, mxEv, prevEvent, lastShownEvent, nextEvent, nextTile);
+                    grouper = new Grouper(
+                        this,
+                        mxEv,
+                        prevEvent,
+                        lastShownEvent,
+                        this.props.layout,
+                        nextEvent,
+                        nextTile,
+                    );
                 }
             }
             if (!grouper) {
@@ -644,12 +693,15 @@ export default class MessagePanel extends React.Component<IProps, IState> {
         }
 
         let willWantDateSeparator = false;
+        let lastInSection = true;
         if (nextEvent) {
             willWantDateSeparator = this.wantsDateSeparator(mxEv, nextEvent.getDate() || new Date());
+            lastInSection = willWantDateSeparator || mxEv.getSender() !== nextEvent.getSender();
         }
 
         // is this a continuation of the previous message?
-        const continuation = !wantsDateSeparator && shouldFormContinuation(prevEvent, mxEv);
+        const continuation = !wantsDateSeparator &&
+            shouldFormContinuation(prevEvent, mxEv, this.showHiddenEvents);
 
         const eventId = mxEv.getId();
         const highlight = (eventId === this.props.highlightedEventId);
@@ -680,6 +732,7 @@ export default class MessagePanel extends React.Component<IProps, IState> {
         // it's successful: we received it.
         isLastSuccessful = isLastSuccessful && mxEv.getSender() === MatrixClientPeg.get().getUserId();
 
+        const callEventGrouper = this.callEventGroupers.get(mxEv.getContent().call_id);
         // use txnId as key if available so that we don't remount during sending
         ret.push(
             <TileErrorBoundary key={mxEv.getTxnId() || eventId} mxEvent={mxEv}>
@@ -702,7 +755,7 @@ export default class MessagePanel extends React.Component<IProps, IState> {
                     isTwelveHour={this.props.isTwelveHour}
                     permalinkCreator={this.props.permalinkCreator}
                     last={last}
-                    lastInSection={willWantDateSeparator}
+                    lastInSection={lastInSection}
                     lastSuccessful={isLastSuccessful}
                     isSelectedEvent={highlight}
                     getRelationsForEvent={this.props.getRelationsForEvent}
@@ -710,6 +763,8 @@ export default class MessagePanel extends React.Component<IProps, IState> {
                     layout={this.props.layout}
                     enableFlair={this.props.enableFlair}
                     showReadReceipts={this.props.showReadReceipts}
+                    callEventGrouper={callEventGrouper}
+                    hideSender={this.membersCount <= 2 && this.props.layout === Layout.Bubble}
                 />
             </TileErrorBoundary>,
         );
@@ -939,6 +994,7 @@ abstract class BaseGrouper {
         public readonly event: MatrixEvent,
         public readonly prevEvent: MatrixEvent,
         public readonly lastShownEvent: MatrixEvent,
+        protected readonly layout: Layout,
         public readonly nextEvent?: MatrixEvent,
         public readonly nextEventTile?: MatrixEvent,
     ) {
@@ -946,7 +1002,7 @@ abstract class BaseGrouper {
     }
 
     public abstract shouldGroup(ev: MatrixEvent): boolean;
-    public abstract add(ev: MatrixEvent): void;
+    public abstract add(ev: MatrixEvent, showHiddenEvents?: boolean): void;
     public abstract getTiles(): ReactNode[];
     public abstract getNewPrevEvent(): MatrixEvent;
 }
@@ -1065,6 +1121,7 @@ class CreationGrouper extends BaseGrouper {
                 onToggle={panel.onHeightChanged} // Update scroll state
                 summaryMembers={[ev.sender]}
                 summaryText={summaryText}
+                layout={this.layout}
             >
                 { eventTiles }
             </EventListSummary>,
@@ -1092,10 +1149,11 @@ class RedactionGrouper extends BaseGrouper {
         ev: MatrixEvent,
         prevEvent: MatrixEvent,
         lastShownEvent: MatrixEvent,
+        layout: Layout,
         nextEvent: MatrixEvent,
         nextEventTile: MatrixEvent,
     ) {
-        super(panel, ev, prevEvent, lastShownEvent, nextEvent, nextEventTile);
+        super(panel, ev, prevEvent, lastShownEvent, layout, nextEvent, nextEventTile);
         this.events = [ev];
     }
 
@@ -1160,6 +1218,7 @@ class RedactionGrouper extends BaseGrouper {
                 onToggle={panel.onHeightChanged} // Update scroll state
                 summaryMembers={Array.from(senders)}
                 summaryText={_t("%(count)s messages deleted.", { count: eventTiles.length })}
+                layout={this.layout}
             >
                 { eventTiles }
             </EventListSummary>,
@@ -1180,7 +1239,7 @@ class RedactionGrouper extends BaseGrouper {
 // Wrap consecutive member events in a ListSummary, ignore if redacted
 class MemberGrouper extends BaseGrouper {
     static canStartGroup = function(panel: MessagePanel, ev: MatrixEvent): boolean {
-        return panel.shouldShowEvent(ev) && membershipTypes.includes(ev.getType() as EventType);
+        return panel.shouldShowEvent(ev) && groupedEvents.includes(ev.getType() as EventType);
     };
 
     constructor(
@@ -1188,8 +1247,9 @@ class MemberGrouper extends BaseGrouper {
         public readonly event: MatrixEvent,
         public readonly prevEvent: MatrixEvent,
         public readonly lastShownEvent: MatrixEvent,
+        protected readonly layout: Layout,
     ) {
-        super(panel, event, prevEvent, lastShownEvent);
+        super(panel, event, prevEvent, lastShownEvent, layout);
         this.events = [event];
     }
 
@@ -1197,13 +1257,13 @@ class MemberGrouper extends BaseGrouper {
         if (this.panel.wantsDateSeparator(this.events[0], ev.getDate())) {
             return false;
         }
-        return membershipTypes.includes(ev.getType() as EventType);
+        return groupedEvents.includes(ev.getType() as EventType);
     }
 
-    public add(ev: MatrixEvent): void {
+    public add(ev: MatrixEvent, showHiddenEvents?: boolean): void {
         if (ev.getType() === EventType.RoomMember) {
             // We can ignore any events that don't actually have a message to display
-            if (!hasText(ev)) return;
+            if (!hasText(ev, showHiddenEvents)) return;
         }
         this.readMarker = this.readMarker || this.panel.readMarkerForEvent(
             ev.getId(),
@@ -1264,6 +1324,7 @@ class MemberGrouper extends BaseGrouper {
                 events={this.events}
                 onToggle={panel.onHeightChanged} // Update scroll state
                 startExpanded={highlightInMels}
+                layout={this.layout}
             >
                 { eventTiles }
             </MemberEventListSummary>,

src/components/structures/MyGroups.js

@@ -109,8 +109,7 @@ export default class MyGroups extends React.Component {
             <SimpleRoomHeader title={_t("Communities")} icon={require("../../../res/img/icons-groups.svg")} />
             <div className='mx_MyGroups_header'>
                 <div className="mx_MyGroups_headerCard">
-                    <AccessibleButton className='mx_MyGroups_headerCard_button' onClick={this._onCreateGroupClick}>
-                    </AccessibleButton>
+                    <AccessibleButton className='mx_MyGroups_headerCard_button' onClick={this._onCreateGroupClick} />
                     <div className="mx_MyGroups_headerCard_content">
                         <div className="mx_MyGroups_headerCard_header">
                             { _t('Create a new community') }
@@ -121,7 +120,7 @@ export default class MyGroups extends React.Component {
                         ) }
                     </div>
                 </div>
-                {/*<div className="mx_MyGroups_joinBox mx_MyGroups_headerCard">
+                { /*<div className="mx_MyGroups_joinBox mx_MyGroups_headerCard">
                     <AccessibleButton className='mx_MyGroups_headerCard_button' onClick={this._onJoinGroupClick}>
                         <img src={require("../../../res/img/icons-create-room.svg")} width="50" height="50" />
                     </AccessibleButton>
@@ -137,7 +136,7 @@ export default class MyGroups extends React.Component {
                             { 'i': (sub) => <i>{ sub }</i> })
                         }
                     </div>
-                </div>*/}
+                </div>*/ }
             </div>
             <BetaCard featureId="feature_spaces" title={_t("Communities are changing to Spaces")} />
             <div className="mx_MyGroups_content">

src/components/structures/NonUrgentToastContainer.tsx

@@ -51,14 +51,14 @@ export default class NonUrgentToastContainer extends React.PureComponent<IProps,
         const toasts = this.state.toasts.map((t, i) => {
             return (
                 <div className="mx_NonUrgentToastContainer_toast" key={`toast-${i}`}>
-                    {React.createElement(t, {})}
+                    { React.createElement(t, {}) }
                 </div>
             );
         });
 
         return (
             <div className="mx_NonUrgentToastContainer" role="alert">
-                {toasts}
+                { toasts }
             </div>
         );
     }

src/components/structures/NotificationPanel.tsx

@@ -23,6 +23,7 @@ import { replaceableComponent } from "../../utils/replaceableComponent";
 import TimelinePanel from "./TimelinePanel";
 import Spinner from "../views/elements/Spinner";
 import { TileShape } from "../views/rooms/EventTile";
+import { Layout } from "../../settings/Layout";
 
 interface IProps {
     onClose(): void;
@@ -35,8 +36,8 @@ interface IProps {
 export default class NotificationPanel extends React.PureComponent<IProps> {
     render() {
         const emptyState = (<div className="mx_RightPanel_empty mx_NotificationPanel_empty">
-            <h2>{_t('You’re all caught up')}</h2>
-            <p>{_t('You have no visible notifications.')}</p>
+            <h2>{ _t('You’re all caught up') }</h2>
+            <p>{ _t('You have no visible notifications.') }</p>
         </div>);
 
         let content;
@@ -52,6 +53,7 @@ export default class NotificationPanel extends React.PureComponent<IProps> {
                     tileShape={TileShape.Notif}
                     empty={emptyState}
                     alwaysShowTimestamps={true}
+                    layout={Layout.Group}
                 />
             );
         } else {

src/components/structures/RightPanel.tsx

@@ -17,6 +17,7 @@ limitations under the License.
 
 import React from 'react';
 import { Room } from "matrix-js-sdk/src/models/room";
+import { RoomState } from "matrix-js-sdk/src/models/room-state";
 import { User } from "matrix-js-sdk/src/models/user";
 import { RoomMember } from "matrix-js-sdk/src/models/room-member";
 import { MatrixEvent } from "matrix-js-sdk/src/models/event";
@@ -48,6 +49,7 @@ import NotificationPanel from "./NotificationPanel";
 import ResizeNotifier from "../../utils/ResizeNotifier";
 import PinnedMessagesCard from "../views/right_panel/PinnedMessagesCard";
 import { throttle } from 'lodash';
+import SpaceStore from "../../stores/SpaceStore";
 
 interface IProps {
     room?: Room; // if showing panels for a given room, this is set
@@ -107,7 +109,7 @@ export default class RightPanel extends React.Component<IProps, IState> {
                 return RightPanelPhases.GroupMemberList;
             }
             return rps.groupPanelPhase;
-        } else if (SettingsStore.getValue("feature_spaces") && this.props.room?.isSpaceRoom()
+        } else if (SpaceStore.spacesEnabled && this.props.room?.isSpaceRoom()
             && !RIGHT_PANEL_SPACE_PHASES.includes(rps.roomPanelPhase)
         ) {
             return RightPanelPhases.SpaceMemberList;
@@ -151,7 +153,7 @@ export default class RightPanel extends React.Component<IProps, IState> {
     }
 
     // TODO: [REACT-WARNING] Replace with appropriate lifecycle event
-    UNSAFE_componentWillReceiveProps(newProps) { // eslint-disable-line camelcase
+    UNSAFE_componentWillReceiveProps(newProps) { // eslint-disable-line
         if (newProps.groupId !== this.props.groupId) {
             this.unregisterGroupStore();
             this.initGroupStore(newProps.groupId);
@@ -173,7 +175,7 @@ export default class RightPanel extends React.Component<IProps, IState> {
         });
     };
 
-    private onRoomStateMember = (ev: MatrixEvent, _, member: RoomMember) => {
+    private onRoomStateMember = (ev: MatrixEvent, state: RoomState, member: RoomMember) => {
         if (!this.props.room || member.roomId !== this.props.room.roomId) {
             return;
         }

src/components/structures/RoomDirectory.tsx

@@ -589,7 +589,7 @@ export default class RoomDirectory extends React.Component<IProps, IState> {
         // We use onMouseDown instead of onClick, so that we can avoid text getting selected
         return [
             <div
-                key={ `${room.room_id}_avatar` }
+                key={`${room.room_id}_avatar`}
                 onMouseDown={(ev) => this.onRoomClicked(room, ev)}
                 className="mx_RoomDirectory_roomAvatar"
             >
@@ -603,7 +603,7 @@ export default class RoomDirectory extends React.Component<IProps, IState> {
                 />
             </div>,
             <div
-                key={ `${room.room_id}_description` }
+                key={`${room.room_id}_description`}
                 onMouseDown={(ev) => this.onRoomClicked(room, ev)}
                 className="mx_RoomDirectory_roomDescription"
             >
@@ -626,14 +626,14 @@ export default class RoomDirectory extends React.Component<IProps, IState> {
                 </div>
             </div>,
             <div
-                key={ `${room.room_id}_memberCount` }
+                key={`${room.room_id}_memberCount`}
                 onMouseDown={(ev) => this.onRoomClicked(room, ev)}
                 className="mx_RoomDirectory_roomMemberCount"
             >
                 { room.num_joined_members }
             </div>,
             <div
-                key={ `${room.room_id}_preview` }
+                key={`${room.room_id}_preview`}
                 onMouseDown={(ev) => this.onRoomClicked(room, ev)}
                 // cancel onMouseDown otherwise shift-clicking highlights text
                 className="mx_RoomDirectory_preview"
@@ -641,7 +641,7 @@ export default class RoomDirectory extends React.Component<IProps, IState> {
                 { previewButton }
             </div>,
             <div
-                key={ `${room.room_id}_join` }
+                key={`${room.room_id}_join`}
                 onMouseDown={(ev) => this.onRoomClicked(room, ev)}
                 className="mx_RoomDirectory_join"
             >
@@ -796,7 +796,7 @@ export default class RoomDirectory extends React.Component<IProps, IState> {
                     showJoinButton={showJoinButton}
                     initialText={this.props.initialText}
                 />
-                {dropdown}
+                { dropdown }
             </div>;
         }
         const explanation =
@@ -814,16 +814,16 @@ export default class RoomDirectory extends React.Component<IProps, IState> {
             }) : _t("Explore rooms");
         return (
             <BaseDialog
-                className={'mx_RoomDirectory_dialog'}
+                className="mx_RoomDirectory_dialog"
                 hasCancel={true}
                 onFinished={this.onFinished}
                 title={title}
             >
                 <div className="mx_RoomDirectory">
-                    {explanation}
+                    { explanation }
                     <div className="mx_RoomDirectory_list">
-                        {listHeader}
-                        {content}
+                        { listHeader }
+                        { content }
                     </div>
                 </div>
             </BaseDialog>

src/components/structures/RoomSearch.tsx

@@ -209,9 +209,9 @@ export default class RoomSearch extends React.PureComponent<IProps, IState> {
 
         return (
             <div className={classes}>
-                {icon}
-                {input}
-                {clearButton}
+                { icon }
+                { input }
+                { clearButton }
             </div>
         );
     }

src/components/structures/RoomStatusBar.js

@@ -222,17 +222,17 @@ export default class RoomStatusBar extends React.PureComponent {
 
         let buttonRow = <>
             <AccessibleButton onClick={this._onCancelAllClick} className="mx_RoomStatusBar_unsentCancelAllBtn">
-                {_t("Delete all")}
+                { _t("Delete all") }
             </AccessibleButton>
             <AccessibleButton onClick={this._onResendAllClick} className="mx_RoomStatusBar_unsentResendAllBtn">
-                {_t("Retry all")}
+                { _t("Retry all") }
             </AccessibleButton>
         </>;
         if (this.state.isResending) {
             buttonRow = <>
                 <InlineSpinner w={20} h={20} />
-                {/* span for css */}
-                <span>{_t("Sending")}</span>
+                { /* span for css */ }
+                <span>{ _t("Sending") }</span>
             </>;
         }
 
@@ -253,7 +253,7 @@ export default class RoomStatusBar extends React.PureComponent {
                         </div>
                     </div>
                     <div className="mx_RoomStatusBar_unsentButtonBar">
-                        {buttonRow}
+                        { buttonRow }
                     </div>
                 </div>
             </div>
@@ -266,14 +266,18 @@ export default class RoomStatusBar extends React.PureComponent {
                 <div className="mx_RoomStatusBar">
                     <div role="alert">
                         <div className="mx_RoomStatusBar_connectionLostBar">
-                            <img src={require("../../../res/img/feather-customised/warning-triangle.svg")} width="24"
-                                height="24" title="/!\ " alt="/!\ " />
+                            <img
+                                src={require("../../../res/img/feather-customised/warning-triangle.svg")}
+                                width="24"
+                                height="24"
+                                title="/!\ "
+                                alt="/!\ " />
                             <div>
                                 <div className="mx_RoomStatusBar_connectionLostBar_title">
-                                    {_t('Connectivity to the server has been lost.')}
+                                    { _t('Connectivity to the server has been lost.') }
                                 </div>
                                 <div className="mx_RoomStatusBar_connectionLostBar_desc">
-                                    {_t('Sent messages will be stored until your connection has returned.')}
+                                    { _t('Sent messages will be stored until your connection has returned.') }
                                 </div>
                             </div>
                         </div>

src/components/structures/RoomView.tsx

@@ -89,6 +89,7 @@ import RoomStatusBar from "./RoomStatusBar";
 import MessageComposer from '../views/rooms/MessageComposer';
 import JumpToBottomButton from "../views/rooms/JumpToBottomButton";
 import TopUnreadMessagesBar from "../views/rooms/TopUnreadMessagesBar";
+import SpaceStore from "../../stores/SpaceStore";
 
 const DEBUG = false;
 let debuglog = function(msg: string) {};
@@ -165,6 +166,11 @@ export interface IState {
     canReply: boolean;
     layout: Layout;
     lowBandwidth: boolean;
+    alwaysShowTimestamps: boolean;
+    showTwelveHourTimestamps: boolean;
+    readMarkerInViewThresholdMs: number;
+    readMarkerOutOfViewThresholdMs: number;
+    showHiddenEventsInTimeline: boolean;
     showReadReceipts: boolean;
     showRedactions: boolean;
     showJoinLeaves: boolean;
@@ -229,6 +235,11 @@ export default class RoomView extends React.Component<IProps, IState> {
             canReply: false,
             layout: SettingsStore.getValue("layout"),
             lowBandwidth: SettingsStore.getValue("lowBandwidth"),
+            alwaysShowTimestamps: SettingsStore.getValue("alwaysShowTimestamps"),
+            showTwelveHourTimestamps: SettingsStore.getValue("showTwelveHourTimestamps"),
+            readMarkerInViewThresholdMs: SettingsStore.getValue("readMarkerInViewThresholdMs"),
+            readMarkerOutOfViewThresholdMs: SettingsStore.getValue("readMarkerOutOfViewThresholdMs"),
+            showHiddenEventsInTimeline: SettingsStore.getValue("showHiddenEventsInTimeline"),
             showReadReceipts: true,
             showRedactions: true,
             showJoinLeaves: true,
@@ -252,7 +263,6 @@ export default class RoomView extends React.Component<IProps, IState> {
         this.context.on("userTrustStatusChanged", this.onUserVerificationChanged);
         this.context.on("crossSigning.keysChanged", this.onCrossSigningKeysChanged);
         this.context.on("Event.decrypted", this.onEventDecrypted);
-        this.context.on("event", this.onEvent);
         // Start listening for RoomViewStore updates
         this.roomStoreToken = RoomViewStore.addListener(this.onRoomViewStoreUpdate);
         this.rightPanelStoreToken = RightPanelStore.getSharedInstance().addListener(this.onRightPanelStoreUpdate);
@@ -261,11 +271,26 @@ export default class RoomView extends React.Component<IProps, IState> {
         WidgetStore.instance.on(UPDATE_EVENT, this.onWidgetStoreUpdate);
 
         this.settingWatchers = [
-            SettingsStore.watchSetting("layout", null, () =>
-                this.setState({ layout: SettingsStore.getValue("layout") }),
+            SettingsStore.watchSetting("layout", null, (...[,,, value]) =>
+                this.setState({ layout: value as Layout }),
             ),
-            SettingsStore.watchSetting("lowBandwidth", null, () =>
-                this.setState({ lowBandwidth: SettingsStore.getValue("lowBandwidth") }),
+            SettingsStore.watchSetting("lowBandwidth", null, (...[,,, value]) =>
+                this.setState({ lowBandwidth: value as boolean }),
+            ),
+            SettingsStore.watchSetting("alwaysShowTimestamps", null, (...[,,, value]) =>
+                this.setState({ alwaysShowTimestamps: value as boolean }),
+            ),
+            SettingsStore.watchSetting("showTwelveHourTimestamps", null, (...[,,, value]) =>
+                this.setState({ showTwelveHourTimestamps: value as boolean }),
+            ),
+            SettingsStore.watchSetting("readMarkerInViewThresholdMs", null, (...[,,, value]) =>
+                this.setState({ readMarkerInViewThresholdMs: value as number }),
+            ),
+            SettingsStore.watchSetting("readMarkerOutOfViewThresholdMs", null, (...[,,, value]) =>
+                this.setState({ readMarkerOutOfViewThresholdMs: value as number }),
+            ),
+            SettingsStore.watchSetting("showHiddenEventsInTimeline", null, (...[,,, value]) =>
+                this.setState({ showHiddenEventsInTimeline: value as boolean }),
             ),
         ];
     }
@@ -332,30 +357,20 @@ export default class RoomView extends React.Component<IProps, IState> {
 
         // Add watchers for each of the settings we just looked up
         this.settingWatchers = this.settingWatchers.concat([
-            SettingsStore.watchSetting("showReadReceipts", null, () =>
-                this.setState({
-                    showReadReceipts: SettingsStore.getValue("showReadReceipts", roomId),
-                }),
+            SettingsStore.watchSetting("showReadReceipts", roomId, (...[,,, value]) =>
+                this.setState({ showReadReceipts: value as boolean }),
             ),
-            SettingsStore.watchSetting("showRedactions", null, () =>
-                this.setState({
-                    showRedactions: SettingsStore.getValue("showRedactions", roomId),
-                }),
+            SettingsStore.watchSetting("showRedactions", roomId, (...[,,, value]) =>
+                this.setState({ showRedactions: value as boolean }),
             ),
-            SettingsStore.watchSetting("showJoinLeaves", null, () =>
-                this.setState({
-                    showJoinLeaves: SettingsStore.getValue("showJoinLeaves", roomId),
-                }),
+            SettingsStore.watchSetting("showJoinLeaves", roomId, (...[,,, value]) =>
+                this.setState({ showJoinLeaves: value as boolean }),
             ),
-            SettingsStore.watchSetting("showAvatarChanges", null, () =>
-                this.setState({
-                    showAvatarChanges: SettingsStore.getValue("showAvatarChanges", roomId),
-                }),
+            SettingsStore.watchSetting("showAvatarChanges", roomId, (...[,,, value]) =>
+                this.setState({ showAvatarChanges: value as boolean }),
             ),
-            SettingsStore.watchSetting("showDisplaynameChanges", null, () =>
-                this.setState({
-                    showDisplaynameChanges: SettingsStore.getValue("showDisplaynameChanges", roomId),
-                }),
+            SettingsStore.watchSetting("showDisplaynameChanges", roomId, (...[,,, value]) =>
+                this.setState({ showDisplaynameChanges: value as boolean }),
             ),
         ]);
 
@@ -636,7 +651,6 @@ export default class RoomView extends React.Component<IProps, IState> {
             this.context.removeListener("userTrustStatusChanged", this.onUserVerificationChanged);
             this.context.removeListener("crossSigning.keysChanged", this.onCrossSigningKeysChanged);
             this.context.removeListener("Event.decrypted", this.onEventDecrypted);
-            this.context.removeListener("event", this.onEvent);
         }
 
         window.removeEventListener('beforeunload', this.onPageUnload);
@@ -836,8 +850,7 @@ export default class RoomView extends React.Component<IProps, IState> {
         if (this.unmounted) return;
 
         // ignore events for other rooms
-        if (!room) return;
-        if (!this.state.room || room.roomId != this.state.room.roomId) return;
+        if (!room || room.roomId !== this.state.room?.roomId) return;
 
         // ignore events from filtered timelines
         if (data.timeline.getTimelineSet() !== room.getUnfilteredTimelineSet()) return;
@@ -858,6 +871,10 @@ export default class RoomView extends React.Component<IProps, IState> {
         // we'll only be showing a spinner.
         if (this.state.joining) return;
 
+        if (!ev.isBeingDecrypted() && !ev.isDecryptionFailure()) {
+            this.handleEffects(ev);
+        }
+
         if (ev.getSender() !== this.context.credentials.userId) {
             // update unread count when scrolled up
             if (!this.state.searchResults && this.state.atEndOfLiveTimeline) {
@@ -870,20 +887,14 @@ export default class RoomView extends React.Component<IProps, IState> {
         }
     };
 
-    private onEventDecrypted = (ev) => {
+    private onEventDecrypted = (ev: MatrixEvent) => {
+        if (!this.state.room || !this.state.matrixClientIsReady) return; // not ready at all
+        if (ev.getRoomId() !== this.state.room.roomId) return; // not for us
         if (ev.isDecryptionFailure()) return;
         this.handleEffects(ev);
     };
 
-    private onEvent = (ev) => {
-        if (ev.isBeingDecrypted() || ev.isDecryptionFailure()) return;
-        this.handleEffects(ev);
-    };
-
-    private handleEffects = (ev) => {
-        if (!this.state.room || !this.state.matrixClientIsReady) return; // not ready at all
-        if (ev.getRoomId() !== this.state.room.roomId) return; // not for us
-
+    private handleEffects = (ev: MatrixEvent) => {
         const notifState = RoomNotificationStateStore.instance.getRoomState(this.state.room);
         if (!notifState.isUnread) return;
 
@@ -916,6 +927,7 @@ export default class RoomView extends React.Component<IProps, IState> {
     // called when state.room is first initialised (either at initial load,
     // after a successful peek, or after we join the room).
     private onRoomLoaded = (room: Room) => {
+        if (this.unmounted) return;
         // Attach a widget store listener only when we get a room
         WidgetLayoutStore.instance.on(WidgetLayoutStore.emissionForRoom(room), this.onWidgetLayoutChange);
         this.onWidgetLayoutChange(); // provoke an update
@@ -930,9 +942,9 @@ export default class RoomView extends React.Component<IProps, IState> {
     };
 
     private async calculateRecommendedVersion(room: Room) {
-        this.setState({
-            upgradeRecommendation: await room.getRecommendedVersion(),
-        });
+        const upgradeRecommendation = await room.getRecommendedVersion();
+        if (this.unmounted) return;
+        this.setState({ upgradeRecommendation });
     }
 
     private async loadMembersIfJoined(room: Room) {
@@ -1022,23 +1034,19 @@ export default class RoomView extends React.Component<IProps, IState> {
     };
 
     private async updateE2EStatus(room: Room) {
-        if (!this.context.isRoomEncrypted(room.roomId)) {
-            return;
-        }
-        if (!this.context.isCryptoEnabled()) {
-            // If crypto is not currently enabled, we aren't tracking devices at all,
-            // so we don't know what the answer is. Let's error on the safe side and show
-            // a warning for this case.
-            this.setState({
-                e2eStatus: E2EStatus.Warning,
-            });
-            return;
+        if (!this.context.isRoomEncrypted(room.roomId)) return;
+
+        // If crypto is not currently enabled, we aren't tracking devices at all,
+        // so we don't know what the answer is. Let's error on the safe side and show
+        // a warning for this case.
+        let e2eStatus = E2EStatus.Warning;
+        if (this.context.isCryptoEnabled()) {
+            /* At this point, the user has encryption on and cross-signing on */
+            e2eStatus = await shieldStatusForRoom(this.context, room);
         }
 
-        /* At this point, the user has encryption on and cross-signing on */
-        this.setState({
-            e2eStatus: await shieldStatusForRoom(this.context, room),
-        });
+        if (this.unmounted) return;
+        this.setState({ e2eStatus });
     }
 
     private onAccountData = (event: MatrixEvent) => {
@@ -1395,7 +1403,7 @@ export default class RoomView extends React.Component<IProps, IState> {
                 continue;
             }
 
-            if (!haveTileForEvent(mxEv)) {
+            if (!haveTileForEvent(mxEv, this.state.showHiddenEventsInTimeline)) {
                 // XXX: can this ever happen? It will make the result count
                 // not match the displayed count.
                 continue;
@@ -1732,7 +1740,8 @@ export default class RoomView extends React.Component<IProps, IState> {
                                 onJoinClick={this.onJoinButtonClicked}
                                 onForgetClick={this.onForgetClick}
                                 onRejectClick={this.onRejectThreepidInviteButtonClicked}
-                                canPreview={false} error={this.state.roomLoadError}
+                                canPreview={false}
+                                error={this.state.roomLoadError}
                                 roomAlias={roomAlias}
                                 joining={this.state.joining}
                                 inviterName={inviterName}
@@ -1748,10 +1757,8 @@ export default class RoomView extends React.Component<IProps, IState> {
         }
 
         const myMembership = this.state.room.getMyMembership();
-        if (myMembership === "invite"
-            // SpaceRoomView handles invites itself
-            && (!SettingsStore.getValue("feature_spaces") || !this.state.room.isSpaceRoom())
-        ) {
+        // SpaceRoomView handles invites itself
+        if (myMembership === "invite" && (!SpaceStore.spacesEnabled || !this.state.room.isSpaceRoom())) {
             if (this.state.joining || this.state.rejecting) {
                 return (
                     <ErrorBoundary>
@@ -1882,7 +1889,7 @@ export default class RoomView extends React.Component<IProps, IState> {
                     room={this.state.room}
                 />
             );
-            if (!this.state.canPeek && (!SettingsStore.getValue("feature_spaces") || !this.state.room?.isSpaceRoom())) {
+            if (!this.state.canPeek && (!SpaceStore.spacesEnabled || !this.state.room?.isSpaceRoom())) {
                 return (
                     <div className="mx_RoomView">
                         { previewBar }
@@ -1896,10 +1903,10 @@ export default class RoomView extends React.Component<IProps, IState> {
                     className="mx_RoomView_auxPanel_hiddenHighlights"
                     onClick={this.onHiddenHighlightsClick}
                 >
-                    {_t(
+                    { _t(
                         "You have %(count)s unread notifications in a prior version of this room.",
                         { count: hiddenHighlightCount },
-                    )}
+                    ) }
                 </AccessibleButton>
             );
         }
@@ -2011,7 +2018,7 @@ export default class RoomView extends React.Component<IProps, IState> {
                 onScroll={this.onMessageListScroll}
                 onUserScroll={this.onUserScroll}
                 onReadMarkerUpdated={this.updateTopUnreadMessagesBar}
-                showUrlPreview = {this.state.showUrlPreview}
+                showUrlPreview={this.state.showUrlPreview}
                 className={messagePanelClassNames}
                 membersLoaded={this.state.membersLoaded}
                 permalinkCreator={this.getPermalinkCreatorForRoom(this.state.room)}
@@ -2061,7 +2068,7 @@ export default class RoomView extends React.Component<IProps, IState> {
         return (
             <RoomContext.Provider value={this.state}>
                 <main className={mainClasses} ref={this.roomView} onKeyDown={this.onReactKeyDown}>
-                    {showChatEffects && this.roomView.current &&
+                    { showChatEffects && this.roomView.current &&
                         <EffectsOverlay roomWidth={this.roomView.current.offsetWidth} />
                     }
                     <ErrorBoundary>
@@ -2080,22 +2087,22 @@ export default class RoomView extends React.Component<IProps, IState> {
                         />
                         <MainSplit panel={rightPanel} resizeNotifier={this.props.resizeNotifier}>
                             <div className="mx_RoomView_body">
-                                {auxPanel}
+                                { auxPanel }
                                 <div className={timelineClasses}>
-                                    {fileDropTarget}
-                                    {topUnreadMessagesBar}
-                                    {jumpToBottom}
-                                    {messagePanel}
-                                    {searchResultsPanel}
+                                    { fileDropTarget }
+                                    { topUnreadMessagesBar }
+                                    { jumpToBottom }
+                                    { messagePanel }
+                                    { searchResultsPanel }
                                 </div>
                                 <div className={statusBarAreaClass}>
                                     <div className="mx_RoomView_statusAreaBox">
                                         <div className="mx_RoomView_statusAreaBox_line" />
-                                        {statusBar}
+                                        { statusBar }
                                     </div>
                                 </div>
-                                {previewBar}
-                                {messageComposer}
+                                { previewBar }
+                                { messageComposer }
                             </div>
                         </MainSplit>
                     </ErrorBoundary>

src/components/structures/ScrollPanel.tsx

@@ -183,8 +183,14 @@ export default class ScrollPanel extends React.Component<IProps> {
     private readonly itemlist = createRef<HTMLOListElement>();
     private unmounted = false;
     private scrollTimeout: Timer;
+    // Are we currently trying to backfill?
     private isFilling: boolean;
+    // Is the current fill request caused by a props update?
+    private isFillingDueToPropsUpdate = false;
+    // Did another request to check the fill state arrive while we were trying to backfill?
     private fillRequestWhileRunning: boolean;
+    // Is that next fill request scheduled because of a props update?
+    private pendingFillDueToPropsUpdate: boolean;
     private scrollState: IScrollState;
     private preventShrinkingState: IPreventShrinkingState;
     private unfillDebouncer: number;
@@ -213,7 +219,7 @@ export default class ScrollPanel extends React.Component<IProps> {
         // adding events to the top).
         //
         // This will also re-check the fill state, in case the paginate was inadequate
-        this.checkScroll();
+        this.checkScroll(true);
         this.updatePreventShrinking();
     }
 
@@ -251,12 +257,12 @@ export default class ScrollPanel extends React.Component<IProps> {
 
     // after an update to the contents of the panel, check that the scroll is
     // where it ought to be, and set off pagination requests if necessary.
-    public checkScroll = () => {
+    public checkScroll = (isFromPropsUpdate = false) => {
         if (this.unmounted) {
             return;
         }
         this.restoreSavedScrollState();
-        this.checkFillState();
+        this.checkFillState(0, isFromPropsUpdate);
     };
 
     // return true if the content is fully scrolled down right now; else false.
@@ -319,7 +325,7 @@ export default class ScrollPanel extends React.Component<IProps> {
     }
 
     // check the scroll state and send out backfill requests if necessary.
-    public checkFillState = async (depth = 0): Promise<void> => {
+    public checkFillState = async (depth = 0, isFromPropsUpdate = false): Promise<void> => {
         if (this.unmounted) {
             return;
         }
@@ -355,14 +361,20 @@ export default class ScrollPanel extends React.Component<IProps> {
         // don't allow more than 1 chain of calls concurrently
         // do make a note when a new request comes in while already running one,
         // so we can trigger a new chain of calls once done.
+        // However, we make an exception for when we're already filling due to a
+        // props (or children) update, because very often the children include
+        // spinners to say whether we're paginating or not, so this would cause
+        // infinite paginating.
         if (isFirstCall) {
-            if (this.isFilling) {
+            if (this.isFilling && !this.isFillingDueToPropsUpdate) {
                 debuglog("isFilling: not entering while request is ongoing, marking for a subsequent request");
                 this.fillRequestWhileRunning = true;
+                this.pendingFillDueToPropsUpdate = isFromPropsUpdate;
                 return;
             }
             debuglog("isFilling: setting");
             this.isFilling = true;
+            this.isFillingDueToPropsUpdate = isFromPropsUpdate;
         }
 
         const itemlist = this.itemlist.current;
@@ -393,11 +405,14 @@ export default class ScrollPanel extends React.Component<IProps> {
         if (isFirstCall) {
             debuglog("isFilling: clearing");
             this.isFilling = false;
+            this.isFillingDueToPropsUpdate = false;
         }
 
         if (this.fillRequestWhileRunning) {
+            const refillDueToPropsUpdate = this.pendingFillDueToPropsUpdate;
             this.fillRequestWhileRunning = false;
-            this.checkFillState();
+            this.pendingFillDueToPropsUpdate = false;
+            this.checkFillState(0, refillDueToPropsUpdate);
         }
     };
 

src/components/structures/SearchBox.js

@@ -136,8 +136,8 @@ export default class SearchBox extends React.Component {
                 key="button"
                 tabIndex={-1}
                 className="mx_SearchBox_closeButton"
-                onClick={ () => {this._clearSearch("button"); } }>
-            </AccessibleButton>) : undefined;
+                onClick={() => {this._clearSearch("button"); }}
+            />) : undefined;
 
         // show a shorter placeholder when blurred, if requested
         // this is used for the room filter field that has
@@ -153,12 +153,12 @@ export default class SearchBox extends React.Component {
                     type="text"
                     ref={this._search}
                     className={"mx_textinput_icon mx_textinput_search " + className}
-                    value={ this.state.searchTerm }
-                    onFocus={ this._onFocus }
-                    onChange={ this.onChange }
-                    onKeyDown={ this._onKeyDown }
+                    value={this.state.searchTerm}
+                    onFocus={this._onFocus}
+                    onChange={this.onChange}
+                    onKeyDown={this._onKeyDown}
                     onBlur={this._onBlur}
-                    placeholder={ placeholder }
+                    placeholder={placeholder}
                     autoComplete="off"
                     autoFocus={this.props.autoFocus}
                 />

src/components/structures/SpaceRoomDirectory.tsx

@@ -14,9 +14,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import React, { ReactNode, useMemo, useState } from "react";
+import React, { ReactNode, KeyboardEvent, useMemo, useState, KeyboardEventHandler } from "react";
 import { Room } from "matrix-js-sdk/src/models/room";
-import { MatrixClient } from "matrix-js-sdk/src/client";
 import { EventType, RoomType } from "matrix-js-sdk/src/@types/event";
 import { ISpaceSummaryRoom, ISpaceSummaryEvent } from "matrix-js-sdk/src/@types/spaces";
 import classNames from "classnames";
@@ -44,11 +43,15 @@ import { getChildOrder } from "../../stores/SpaceStore";
 import AccessibleTooltipButton from "../views/elements/AccessibleTooltipButton";
 import { linkifyElement } from "../../HtmlUtils";
 import { getDisplayAliasForAliasSet } from "../../Rooms";
+import { useDispatcher } from "../../hooks/useDispatcher";
+import defaultDispatcher from "../../dispatcher/dispatcher";
+import { Action } from "../../dispatcher/actions";
+import { Key } from "../../Keyboard";
+import { IState, RovingTabIndexProvider, useRovingTabIndex } from "../../accessibility/RovingTabIndex";
 
 interface IHierarchyProps {
     space: Room;
     initialText?: string;
-    refreshToken?: any;
     additionalButtons?: ReactNode;
     showRoom(room: ISpaceSummaryRoom, viaServers?: string[], autoJoin?: boolean): void;
 }
@@ -79,6 +82,7 @@ const Tile: React.FC<ITileProps> = ({
         || (room.room_type === RoomType.Space ? _t("Unnamed Space") : _t("Unnamed Room"));
 
     const [showChildren, toggleShowChildren] = useStateToggle(true);
+    const [onFocus, isActive, ref] = useRovingTabIndex();
 
     const onPreviewClick = (ev: ButtonEvent) => {
         ev.preventDefault();
@@ -93,11 +97,21 @@ const Tile: React.FC<ITileProps> = ({
 
     let button;
     if (joinedRoom) {
-        button = <AccessibleButton onClick={onPreviewClick} kind="primary_outline">
+        button = <AccessibleButton
+            onClick={onPreviewClick}
+            kind="primary_outline"
+            onFocus={onFocus}
+            tabIndex={isActive ? 0 : -1}
+        >
             { _t("View") }
         </AccessibleButton>;
     } else if (onJoinClick) {
-        button = <AccessibleButton onClick={onJoinClick} kind="primary">
+        button = <AccessibleButton
+            onClick={onJoinClick}
+            kind="primary"
+            onFocus={onFocus}
+            tabIndex={isActive ? 0 : -1}
+        >
             { _t("Join") }
         </AccessibleButton>;
     }
@@ -105,13 +119,13 @@ const Tile: React.FC<ITileProps> = ({
     let checkbox;
     if (onToggleClick) {
         if (hasPermissions) {
-            checkbox = <StyledCheckbox checked={!!selected} onChange={onToggleClick} />;
+            checkbox = <StyledCheckbox checked={!!selected} onChange={onToggleClick} tabIndex={isActive ? 0 : -1} />;
         } else {
             checkbox = <TextWithTooltip
                 tooltip={_t("You don't have permission")}
                 onClick={ev => { ev.stopPropagation(); }}
             >
-                <StyledCheckbox disabled={true} />
+                <StyledCheckbox disabled={true} tabIndex={isActive ? 0 : -1} />
             </TextWithTooltip>;
         }
     }
@@ -171,8 +185,9 @@ const Tile: React.FC<ITileProps> = ({
         </div>
     </React.Fragment>;
 
-    let childToggle;
-    let childSection;
+    let childToggle: JSX.Element;
+    let childSection: JSX.Element;
+    let onKeyDown: KeyboardEventHandler;
     if (children) {
         // the chevron is purposefully a div rather than a button as it should be ignored for a11y
         childToggle = <div
@@ -184,25 +199,74 @@ const Tile: React.FC<ITileProps> = ({
                 toggleShowChildren();
             }}
         />;
+
         if (showChildren) {
-            childSection = <div className="mx_SpaceRoomDirectory_subspace_children">
+            const onChildrenKeyDown = (e) => {
+                if (e.key === Key.ARROW_LEFT) {
+                    e.preventDefault();
+                    e.stopPropagation();
+                    ref.current?.focus();
+                }
+            };
+
+            childSection = <div
+                className="mx_SpaceRoomDirectory_subspace_children"
+                onKeyDown={onChildrenKeyDown}
+                role="group"
+            >
                 { children }
             </div>;
         }
+
+        onKeyDown = (e) => {
+            let handled = false;
+
+            switch (e.key) {
+                case Key.ARROW_LEFT:
+                    if (showChildren) {
+                        handled = true;
+                        toggleShowChildren();
+                    }
+                    break;
+
+                case Key.ARROW_RIGHT:
+                    handled = true;
+                    if (showChildren) {
+                        const childSection = ref.current?.nextElementSibling;
+                        childSection?.querySelector<HTMLDivElement>(".mx_SpaceRoomDirectory_roomTile")?.focus();
+                    } else {
+                        toggleShowChildren();
+                    }
+                    break;
+            }
+
+            if (handled) {
+                e.preventDefault();
+                e.stopPropagation();
+            }
+        };
     }
 
-    return <>
+    return <li
+        className="mx_SpaceRoomDirectory_roomTileWrapper"
+        role="treeitem"
+        aria-expanded={children ? showChildren : undefined}
+    >
         <AccessibleButton
             className={classNames("mx_SpaceRoomDirectory_roomTile", {
                 mx_SpaceRoomDirectory_subspace: room.room_type === RoomType.Space,
             })}
             onClick={(hasPermissions && onToggleClick) ? onToggleClick : onPreviewClick}
+            onKeyDown={onKeyDown}
+            inputRef={ref}
+            onFocus={onFocus}
+            tabIndex={isActive ? 0 : -1}
         >
             { content }
             { childToggle }
         </AccessibleButton>
         { childSection }
-    </>;
+    </li>;
 };
 
 export const showRoom = (room: ISpaceSummaryRoom, viaServers?: string[], autoJoin = false) => {
@@ -315,18 +379,25 @@ export const HierarchyLevel = ({
     </React.Fragment>;
 };
 
-// mutate argument refreshToken to force a reload
-export const useSpaceSummary = (cli: MatrixClient, space: Room, refreshToken?: any): [
+export const useSpaceSummary = (space: Room): [
     null,
     ISpaceSummaryRoom[],
     Map<string, Map<string, ISpaceSummaryEvent>>?,
     Map<string, Set<string>>?,
     Map<string, Set<string>>?,
 ] | [Error] => {
+    // crude temporary refresh token approach until we have pagination and rework the data flow here
+    const [refreshToken, setRefreshToken] = useState(0);
+    useDispatcher(defaultDispatcher, (payload => {
+        if (payload.action === Action.UpdateSpaceHierarchy) {
+            setRefreshToken(t => t + 1);
+        }
+    }));
+
     // TODO pagination
     return useAsyncMemo(async () => {
         try {
-            const data = await cli.getSpaceSummary(space.roomId);
+            const data = await space.client.getSpaceSummary(space.roomId);
 
             const parentChildRelations = new EnhancedMap<string, Map<string, ISpaceSummaryEvent>>();
             const childParentRelations = new EnhancedMap<string, Set<string>>();
@@ -354,7 +425,6 @@ export const SpaceHierarchy: React.FC<IHierarchyProps> = ({
     space,
     initialText = "",
     showRoom,
-    refreshToken,
     additionalButtons,
     children,
 }) => {
@@ -364,7 +434,7 @@ export const SpaceHierarchy: React.FC<IHierarchyProps> = ({
 
     const [selected, setSelected] = useState(new Map<string, Set<string>>()); // Map<parentId, Set<childId>>
 
-    const [summaryError, rooms, parentChildMap, viaMap, childParentMap] = useSpaceSummary(cli, space, refreshToken);
+    const [summaryError, rooms, parentChildMap, viaMap, childParentMap] = useSpaceSummary(space);
 
     const roomsMap = useMemo(() => {
         if (!rooms) return null;
@@ -404,179 +474,199 @@ export const SpaceHierarchy: React.FC<IHierarchyProps> = ({
     const [saving, setSaving] = useState(false);
 
     if (summaryError) {
-        return <p>{_t("Your server does not support showing space hierarchies.")}</p>;
+        return <p>{ _t("Your server does not support showing space hierarchies.") }</p>;
     }
 
-    let content;
-    if (roomsMap) {
-        const numRooms = Array.from(roomsMap.values()).filter(r => !r.room_type).length;
-        const numSpaces = roomsMap.size - numRooms - 1; // -1 at the end to exclude the space we are looking at
-
-        let countsStr;
-        if (numSpaces > 1) {
-            countsStr = _t("%(count)s rooms and %(numSpaces)s spaces", { count: numRooms, numSpaces });
-        } else if (numSpaces > 0) {
-            countsStr = _t("%(count)s rooms and 1 space", { count: numRooms, numSpaces });
-        } else {
-            countsStr = _t("%(count)s rooms", { count: numRooms, numSpaces });
+    const onKeyDown = (ev: KeyboardEvent, state: IState) => {
+        if (ev.key === Key.ARROW_DOWN && ev.currentTarget.classList.contains("mx_SpaceRoomDirectory_search")) {
+            state.refs[0]?.current?.focus();
         }
-
-        let manageButtons;
-        if (space.getMyMembership() === "join" && space.currentState.maySendStateEvent(EventType.SpaceChild, userId)) {
-            const selectedRelations = Array.from(selected.keys()).flatMap(parentId => {
-                return [...selected.get(parentId).values()].map(childId => [parentId, childId]) as [string, string][];
-            });
-
-            const selectionAllSuggested = selectedRelations.every(([parentId, childId]) => {
-                return parentChildMap.get(parentId)?.get(childId)?.content.suggested;
-            });
-
-            const disabled = !selectedRelations.length || removing || saving;
-
-            let Button: React.ComponentType<React.ComponentProps<typeof AccessibleButton>> = AccessibleButton;
-            let props = {};
-            if (!selectedRelations.length) {
-                Button = AccessibleTooltipButton;
-                props = {
-                    tooltip: _t("Select a room below first"),
-                    yOffset: -40,
-                };
-            }
-
-            manageButtons = <>
-                <Button
-                    {...props}
-                    onClick={async () => {
-                        setRemoving(true);
-                        try {
-                            for (const [parentId, childId] of selectedRelations) {
-                                await cli.sendStateEvent(parentId, EventType.SpaceChild, {}, childId);
-                                parentChildMap.get(parentId).delete(childId);
-                                if (parentChildMap.get(parentId).size > 0) {
-                                    parentChildMap.set(parentId, new Map(parentChildMap.get(parentId)));
-                                } else {
-                                    parentChildMap.delete(parentId);
-                                }
-                            }
-                        } catch (e) {
-                            setError(_t("Failed to remove some rooms. Try again later"));
-                        }
-                        setRemoving(false);
-                    }}
-                    kind="danger_outline"
-                    disabled={disabled}
-                >
-                    { removing ? _t("Removing...") : _t("Remove") }
-                </Button>
-                <Button
-                    {...props}
-                    onClick={async () => {
-                        setSaving(true);
-                        try {
-                            for (const [parentId, childId] of selectedRelations) {
-                                const suggested = !selectionAllSuggested;
-                                const existingContent = parentChildMap.get(parentId)?.get(childId)?.content;
-                                if (!existingContent || existingContent.suggested === suggested) continue;
-
-                                const content = {
-                                    ...existingContent,
-                                    suggested: !selectionAllSuggested,
-                                };
-
-                                await cli.sendStateEvent(parentId, EventType.SpaceChild, content, childId);
-
-                                parentChildMap.get(parentId).get(childId).content = content;
-                                parentChildMap.set(parentId, new Map(parentChildMap.get(parentId)));
-                            }
-                        } catch (e) {
-                            setError("Failed to update some suggestions. Try again later");
-                        }
-                        setSaving(false);
-                        setSelected(new Map());
-                    }}
-                    kind="primary_outline"
-                    disabled={disabled}
-                >
-                    { saving
-                        ? _t("Saving...")
-                        : (selectionAllSuggested ? _t("Mark as not suggested") : _t("Mark as suggested"))
-                    }
-                </Button>
-            </>;
-        }
-
-        let results;
-        if (roomsMap.size) {
-            const hasPermissions = space?.currentState.maySendStateEvent(EventType.SpaceChild, cli.getUserId());
-
-            results = <>
-                <HierarchyLevel
-                    spaceId={space.roomId}
-                    rooms={roomsMap}
-                    relations={parentChildMap}
-                    parents={new Set()}
-                    selectedMap={selected}
-                    onToggleClick={hasPermissions ? (parentId, childId) => {
-                        setError("");
-                        if (!selected.has(parentId)) {
-                            setSelected(new Map(selected.set(parentId, new Set([childId]))));
-                            return;
-                        }
-
-                        const parentSet = selected.get(parentId);
-                        if (!parentSet.has(childId)) {
-                            setSelected(new Map(selected.set(parentId, new Set([...parentSet, childId]))));
-                            return;
-                        }
-
-                        parentSet.delete(childId);
-                        setSelected(new Map(selected.set(parentId, new Set(parentSet))));
-                    } : undefined}
-                    onViewRoomClick={(roomId, autoJoin) => {
-                        showRoom(roomsMap.get(roomId), Array.from(viaMap.get(roomId) || []), autoJoin);
-                    }}
-                />
-                { children && <hr /> }
-            </>;
-        } else {
-            results = <div className="mx_SpaceRoomDirectory_noResults">
-                <h3>{ _t("No results found") }</h3>
-                <div>{ _t("You may want to try a different search or check for typos.") }</div>
-            </div>;
-        }
-
-        content = <>
-            <div className="mx_SpaceRoomDirectory_listHeader">
-                { countsStr }
-                <span>
-                    { additionalButtons }
-                    { manageButtons }
-                </span>
-            </div>
-            { error && <div className="mx_SpaceRoomDirectory_error">
-                { error }
-            </div> }
-            <AutoHideScrollbar className="mx_SpaceRoomDirectory_list">
-                { results }
-                { children }
-            </AutoHideScrollbar>
-        </>;
-    } else {
-        content = <Spinner />;
-    }
+    };
 
     // TODO loading state/error state
-    return <>
-        <SearchBox
-            className="mx_textinput_icon mx_textinput_search"
-            placeholder={ _t("Search names and descriptions") }
-            onSearch={setQuery}
-            autoFocus={true}
-            initialValue={initialText}
-        />
+    return <RovingTabIndexProvider onKeyDown={onKeyDown} handleHomeEnd handleUpDown>
+        { ({ onKeyDownHandler }) => {
+            let content;
+            if (roomsMap) {
+                const numRooms = Array.from(roomsMap.values()).filter(r => !r.room_type).length;
+                const numSpaces = roomsMap.size - numRooms - 1; // -1 at the end to exclude the space we are looking at
 
-        { content }
-    </>;
+                let countsStr;
+                if (numSpaces > 1) {
+                    countsStr = _t("%(count)s rooms and %(numSpaces)s spaces", { count: numRooms, numSpaces });
+                } else if (numSpaces > 0) {
+                    countsStr = _t("%(count)s rooms and 1 space", { count: numRooms, numSpaces });
+                } else {
+                    countsStr = _t("%(count)s rooms", { count: numRooms, numSpaces });
+                }
+
+                let manageButtons;
+                if (space.getMyMembership() === "join" &&
+                    space.currentState.maySendStateEvent(EventType.SpaceChild, userId)
+                ) {
+                    const selectedRelations = Array.from(selected.keys()).flatMap(parentId => {
+                        return [
+                            ...selected.get(parentId).values(),
+                        ].map(childId => [parentId, childId]) as [string, string][];
+                    });
+
+                    const selectionAllSuggested = selectedRelations.every(([parentId, childId]) => {
+                        return parentChildMap.get(parentId)?.get(childId)?.content.suggested;
+                    });
+
+                    const disabled = !selectedRelations.length || removing || saving;
+
+                    let Button: React.ComponentType<React.ComponentProps<typeof AccessibleButton>> = AccessibleButton;
+                    let props = {};
+                    if (!selectedRelations.length) {
+                        Button = AccessibleTooltipButton;
+                        props = {
+                            tooltip: _t("Select a room below first"),
+                            yOffset: -40,
+                        };
+                    }
+
+                    manageButtons = <>
+                        <Button
+                            {...props}
+                            onClick={async () => {
+                                setRemoving(true);
+                                try {
+                                    for (const [parentId, childId] of selectedRelations) {
+                                        await cli.sendStateEvent(parentId, EventType.SpaceChild, {}, childId);
+                                        parentChildMap.get(parentId).delete(childId);
+                                        if (parentChildMap.get(parentId).size > 0) {
+                                            parentChildMap.set(parentId, new Map(parentChildMap.get(parentId)));
+                                        } else {
+                                            parentChildMap.delete(parentId);
+                                        }
+                                    }
+                                } catch (e) {
+                                    setError(_t("Failed to remove some rooms. Try again later"));
+                                }
+                                setRemoving(false);
+                            }}
+                            kind="danger_outline"
+                            disabled={disabled}
+                        >
+                            { removing ? _t("Removing...") : _t("Remove") }
+                        </Button>
+                        <Button
+                            {...props}
+                            onClick={async () => {
+                                setSaving(true);
+                                try {
+                                    for (const [parentId, childId] of selectedRelations) {
+                                        const suggested = !selectionAllSuggested;
+                                        const existingContent = parentChildMap.get(parentId)?.get(childId)?.content;
+                                        if (!existingContent || existingContent.suggested === suggested) continue;
+
+                                        const content = {
+                                            ...existingContent,
+                                            suggested: !selectionAllSuggested,
+                                        };
+
+                                        await cli.sendStateEvent(parentId, EventType.SpaceChild, content, childId);
+
+                                        parentChildMap.get(parentId).get(childId).content = content;
+                                        parentChildMap.set(parentId, new Map(parentChildMap.get(parentId)));
+                                    }
+                                } catch (e) {
+                                    setError("Failed to update some suggestions. Try again later");
+                                }
+                                setSaving(false);
+                                setSelected(new Map());
+                            }}
+                            kind="primary_outline"
+                            disabled={disabled}
+                        >
+                            { saving
+                                ? _t("Saving...")
+                                : (selectionAllSuggested ? _t("Mark as not suggested") : _t("Mark as suggested"))
+                            }
+                        </Button>
+                    </>;
+                }
+
+                let results;
+                if (roomsMap.size) {
+                    const hasPermissions = space?.currentState.maySendStateEvent(EventType.SpaceChild, cli.getUserId());
+
+                    results = <>
+                        <HierarchyLevel
+                            spaceId={space.roomId}
+                            rooms={roomsMap}
+                            relations={parentChildMap}
+                            parents={new Set()}
+                            selectedMap={selected}
+                            onToggleClick={hasPermissions ? (parentId, childId) => {
+                                setError("");
+                                if (!selected.has(parentId)) {
+                                    setSelected(new Map(selected.set(parentId, new Set([childId]))));
+                                    return;
+                                }
+
+                                const parentSet = selected.get(parentId);
+                                if (!parentSet.has(childId)) {
+                                    setSelected(new Map(selected.set(parentId, new Set([...parentSet, childId]))));
+                                    return;
+                                }
+
+                                parentSet.delete(childId);
+                                setSelected(new Map(selected.set(parentId, new Set(parentSet))));
+                            } : undefined}
+                            onViewRoomClick={(roomId, autoJoin) => {
+                                showRoom(roomsMap.get(roomId), Array.from(viaMap.get(roomId) || []), autoJoin);
+                            }}
+                        />
+                        { children && <hr /> }
+                    </>;
+                } else {
+                    results = <div className="mx_SpaceRoomDirectory_noResults">
+                        <h3>{ _t("No results found") }</h3>
+                        <div>{ _t("You may want to try a different search or check for typos.") }</div>
+                    </div>;
+                }
+
+                content = <>
+                    <div className="mx_SpaceRoomDirectory_listHeader">
+                        { countsStr }
+                        <span>
+                            { additionalButtons }
+                            { manageButtons }
+                        </span>
+                    </div>
+                    { error && <div className="mx_SpaceRoomDirectory_error">
+                        { error }
+                    </div> }
+                    <AutoHideScrollbar
+                        className="mx_SpaceRoomDirectory_list"
+                        onKeyDown={onKeyDownHandler}
+                        role="tree"
+                        aria-label={_t("Space")}
+                    >
+                        { results }
+                        { children }
+                    </AutoHideScrollbar>
+                </>;
+            } else {
+                content = <Spinner />;
+            }
+
+            return <>
+                <SearchBox
+                    className="mx_SpaceRoomDirectory_search mx_textinput_icon mx_textinput_search"
+                    placeholder={_t("Search names and descriptions")}
+                    onSearch={setQuery}
+                    autoFocus={true}
+                    initialValue={initialText}
+                    onKeyDown={onKeyDownHandler}
+                />
+
+                { content }
+            </>;
+        } }
+    </RovingTabIndexProvider>;
 };
 
 interface IProps {
@@ -608,7 +698,7 @@ const SpaceRoomDirectory: React.FC<IProps> = ({ space, onFinished, initialText }
                 { _t("If you can't find the room you're looking for, ask for an invite or <a>create a new room</a>.",
                     null,
                     { a: sub => {
-                        return <AccessibleButton kind="link" onClick={onCreateRoomClick}>{sub}</AccessibleButton>;
+                        return <AccessibleButton kind="link" onClick={onCreateRoomClick}>{ sub }</AccessibleButton>;
                     } },
                 ) }
 

src/components/structures/SpaceRoomView.tsx

@@ -16,7 +16,7 @@ limitations under the License.
 
 import React, { RefObject, useContext, useRef, useState } from "react";
 import { EventType } from "matrix-js-sdk/src/@types/event";
-import { Preset } from "matrix-js-sdk/src/@types/partials";
+import { Preset, JoinRule } from "matrix-js-sdk/src/@types/partials";
 import { Room } from "matrix-js-sdk/src/models/room";
 import { EventSubscription } from "fbemitter";
 
@@ -47,13 +47,23 @@ import { RightPanelPhases } from "../../stores/RightPanelStorePhases";
 import { SetRightPanelPhasePayload } from "../../dispatcher/payloads/SetRightPanelPhasePayload";
 import { useStateArray } from "../../hooks/useStateArray";
 import SpacePublicShare from "../views/spaces/SpacePublicShare";
-import { shouldShowSpaceSettings, showAddExistingRooms, showCreateNewRoom, showSpaceSettings } from "../../utils/space";
+import {
+    shouldShowSpaceSettings,
+    showAddExistingRooms,
+    showCreateNewRoom,
+    showCreateNewSubspace,
+    showSpaceSettings,
+} from "../../utils/space";
 import { showRoom, SpaceHierarchy } from "./SpaceRoomDirectory";
 import MemberAvatar from "../views/avatars/MemberAvatar";
-import { useStateToggle } from "../../hooks/useStateToggle";
 import SpaceStore from "../../stores/SpaceStore";
 import FacePile from "../views/elements/FacePile";
-import { AddExistingToSpace } from "../views/dialogs/AddExistingToSpaceDialog";
+import {
+    AddExistingToSpace,
+    defaultDmsRenderer,
+    defaultRoomsRenderer,
+    defaultSpacesRenderer,
+} from "../views/dialogs/AddExistingToSpaceDialog";
 import { ChevronFace, ContextMenuButton, useContextMenu } from "./ContextMenu";
 import IconizedContextMenu, {
     IconizedContextMenuOption,
@@ -62,12 +72,8 @@ import IconizedContextMenu, {
 import AccessibleTooltipButton from "../views/elements/AccessibleTooltipButton";
 import { BetaPill } from "../views/beta/BetaCard";
 import { UserTab } from "../views/dialogs/UserSettingsDialog";
-import SettingsStore from "../../settings/SettingsStore";
-import Modal from "../../Modal";
-import BetaFeedbackDialog from "../views/dialogs/BetaFeedbackDialog";
-import SdkConfig from "../../SdkConfig";
 import { EffectiveMembership, getEffectiveMembership } from "../../utils/membership";
-import { JoinRule } from "../views/settings/tabs/room/SecurityRoomSettingsTab";
+import { SpaceFeedbackPrompt } from "../views/spaces/SpaceCreateMenu";
 
 interface IProps {
     space: Room;
@@ -94,26 +100,6 @@ enum Phase {
     PrivateExistingRooms,
 }
 
-// XXX: Temporary for the Spaces Beta only
-export const SpaceFeedbackPrompt = ({ onClick }: { onClick?: () => void }) => {
-    if (!SdkConfig.get().bug_report_endpoint_url) return null;
-
-    return <div className="mx_SpaceFeedbackPrompt">
-        <hr />
-        <div>
-            <span className="mx_SpaceFeedbackPrompt_text">{ _t("Spaces are a beta feature.") }</span>
-            <AccessibleButton kind="link" onClick={() => {
-                if (onClick) onClick();
-                Modal.createTrackedDialog("Beta Feedback", "feature_spaces", BetaFeedbackDialog, {
-                    featureId: "feature_spaces",
-                });
-            }}>
-                { _t("Feedback") }
-            </AccessibleButton>
-        </div>
-    </div>;
-};
-
 const RoomMemberCount = ({ room, children }) => {
     const members = useRoomMembers(room);
     const count = members.length;
@@ -147,7 +133,7 @@ const SpaceInfo = ({ space }) => {
     return <div className="mx_SpaceRoomView_info">
         { visibilitySection }
         { joinRule === "public" && <RoomMemberCount room={space}>
-            {(count) => count > 0 ? (
+            { (count) => count > 0 ? (
                 <AccessibleButton
                     kind="link"
                     onClick={() => {
@@ -160,7 +146,7 @@ const SpaceInfo = ({ space }) => {
                 >
                     { _t("%(count)s members", { count }) }
                 </AccessibleButton>
-            ) : null}
+            ) : null }
         </RoomMemberCount> }
     </div>;
 };
@@ -178,7 +164,7 @@ const SpacePreview = ({ space, onJoinButtonClicked, onRejectButtonClicked }) =>
 
     const [busy, setBusy] = useState(false);
 
-    const spacesEnabled = SettingsStore.getValue("feature_spaces");
+    const spacesEnabled = SpaceStore.spacesEnabled;
 
     const cannotJoin = getEffectiveMembership(myMembership) === EffectiveMembership.Leave
         && space.getJoinRule() !== JoinRule.Public;
@@ -206,11 +192,11 @@ const SpacePreview = ({ space, onJoinButtonClicked, onRejectButtonClicked }) =>
 
         if (inviteSender) {
             inviterSection = <div className="mx_SpaceRoomView_preview_inviter">
-                <MemberAvatar member={inviter} width={32} height={32} />
+                <MemberAvatar member={inviter} fallbackUserId={inviteSender} width={32} height={32} />
                 <div>
                     <div className="mx_SpaceRoomView_preview_inviter_name">
                         { _t("<inviter/> invites you", {}, {
-                            inviter: () => <b>{ inviter.name || inviteSender }</b>,
+                            inviter: () => <b>{ inviter?.name || inviteSender }</b>,
                         }) }
                     </div>
                     { inviter ? <div className="mx_SpaceRoomView_preview_inviter_mxid">
@@ -293,7 +279,7 @@ const SpacePreview = ({ space, onJoinButtonClicked, onRejectButtonClicked }) =>
         </h1>
         <SpaceInfo space={space} />
         <RoomTopic room={space}>
-            {(topic, ref) =>
+            { (topic, ref) =>
                 <div className="mx_SpaceRoomView_preview_topic" ref={ref}>
                     { topic }
                 </div>
@@ -307,8 +293,7 @@ const SpacePreview = ({ space, onJoinButtonClicked, onRejectButtonClicked }) =>
     </div>;
 };
 
-const SpaceLandingAddButton = ({ space, onNewRoomAdded }) => {
-    const cli = useContext(MatrixClientContext);
+const SpaceLandingAddButton = ({ space }) => {
     const [menuDisplayed, handle, openMenu, closeMenu] = useContextMenu();
 
     let contextMenu;
@@ -331,25 +316,33 @@ const SpaceLandingAddButton = ({ space, onNewRoomAdded }) => {
                         e.stopPropagation();
                         closeMenu();
 
-                        if (await showCreateNewRoom(cli, space)) {
-                            onNewRoomAdded();
+                        if (await showCreateNewRoom(space)) {
+                            defaultDispatcher.fire(Action.UpdateSpaceHierarchy);
                         }
                     }}
                 />
                 <IconizedContextMenuOption
                     label={_t("Add existing room")}
                     iconClassName="mx_RoomList_iconHash"
-                    onClick={async (e) => {
+                    onClick={(e) => {
                         e.preventDefault();
                         e.stopPropagation();
                         closeMenu();
-
-                        const [added] = await showAddExistingRooms(cli, space);
-                        if (added) {
-                            onNewRoomAdded();
-                        }
+                        showAddExistingRooms(space);
                     }}
                 />
+                <IconizedContextMenuOption
+                    label={_t("Add space")}
+                    iconClassName="mx_RoomList_iconPlus"
+                    onClick={(e) => {
+                        e.preventDefault();
+                        e.stopPropagation();
+                        closeMenu();
+                        showCreateNewSubspace(space);
+                    }}
+                >
+                    <BetaPill />
+                </IconizedContextMenuOption>
             </IconizedContextMenuOptionList>
         </IconizedContextMenu>;
     }
@@ -390,19 +383,17 @@ const SpaceLanding = ({ space }) => {
 
     const canAddRooms = myMembership === "join" && space.currentState.maySendStateEvent(EventType.SpaceChild, userId);
 
-    const [refreshToken, forceUpdate] = useStateToggle(false);
-
     let addRoomButton;
     if (canAddRooms) {
-        addRoomButton = <SpaceLandingAddButton space={space} onNewRoomAdded={forceUpdate} />;
+        addRoomButton = <SpaceLandingAddButton space={space} />;
     }
 
     let settingsButton;
-    if (shouldShowSpaceSettings(cli, space)) {
+    if (shouldShowSpaceSettings(space)) {
         settingsButton = <AccessibleTooltipButton
             className="mx_SpaceRoomView_landing_settingsButton"
             onClick={() => {
-                showSpaceSettings(cli, space);
+                showSpaceSettings(space);
             }}
             title={_t("Settings")}
         />;
@@ -417,15 +408,16 @@ const SpaceLanding = ({ space }) => {
     };
 
     return <div className="mx_SpaceRoomView_landing">
+        <SpaceFeedbackPrompt />
         <RoomAvatar room={space} height={80} width={80} viewAvatarOnClick={true} />
         <div className="mx_SpaceRoomView_landing_name">
             <RoomName room={space}>
-                {(name) => {
+                { (name) => {
                     const tags = { name: () => <div className="mx_SpaceRoomView_landing_nameRow">
                         <h1>{ name }</h1>
                     </div> };
                     return _t("Welcome to <name/>", {}, tags) as JSX.Element;
-                }}
+                } }
             </RoomName>
         </div>
         <div className="mx_SpaceRoomView_landing_info">
@@ -435,21 +427,14 @@ const SpaceLanding = ({ space }) => {
             { settingsButton }
         </div>
         <RoomTopic room={space}>
-            {(topic, ref) => (
+            { (topic, ref) => (
                 <div className="mx_SpaceRoomView_landing_topic" ref={ref}>
                     { topic }
                 </div>
-            )}
+            ) }
         </RoomTopic>
-        <SpaceFeedbackPrompt />
-        <hr />
 
-        <SpaceHierarchy
-            space={space}
-            showRoom={showRoom}
-            refreshToken={refreshToken}
-            additionalButtons={addRoomButton}
-        />
+        <SpaceHierarchy space={space} showRoom={showRoom} additionalButtons={addRoomButton} />
     </div>;
 };
 
@@ -459,7 +444,7 @@ const SpaceSetupFirstRooms = ({ space, title, description, onFinished }) => {
     const numFields = 3;
     const placeholders = [_t("General"), _t("Random"), _t("Support")];
     const [roomNames, setRoomName] = useStateArray(numFields, [_t("General"), _t("Random"), ""]);
-    const fields = new Array(numFields).fill(0).map((_, i) => {
+    const fields = new Array(numFields).fill(0).map((x, i) => {
         const name = "roomName" + i;
         return <Field
             key={name}
@@ -532,7 +517,6 @@ const SpaceSetupFirstRooms = ({ space, title, description, onFinished }) => {
                 value={buttonLabel}
             />
         </div>
-        <SpaceFeedbackPrompt />
     </div>;
 };
 
@@ -551,13 +535,12 @@ const SpaceAddExistingRooms = ({ space, onFinished }) => {
                     { _t("Skip for now") }
                 </AccessibleButton>
             }
+            filterPlaceholder={_t("Search for rooms or spaces")}
             onFinished={onFinished}
+            roomsRenderer={defaultRoomsRenderer}
+            spacesRenderer={defaultSpacesRenderer}
+            dmsRenderer={defaultDmsRenderer}
         />
-
-        <div className="mx_SpaceRoomView_buttons">
-
-        </div>
-        <SpaceFeedbackPrompt />
     </div>;
 };
 
@@ -577,7 +560,6 @@ const SpaceSetupPublicShare = ({ justCreatedOpts, space, onFinished, createdRoom
                 { createdRooms ? _t("Go to my first room") : _t("Go to my space") }
             </AccessibleButton>
         </div>
-        <SpaceFeedbackPrompt />
     </div>;
 };
 
@@ -606,9 +588,8 @@ const SpaceSetupPrivateScope = ({ space, justCreatedOpts, onFinished }) => {
         </AccessibleButton>
         <div className="mx_SpaceRoomView_betaWarning">
             <h3>{ _t("Teammates might not be able to view or join any private rooms you make.") }</h3>
-            <p>{ _t("We're working on this as part of the beta, but just want to let you know.") }</p>
+            <p>{ _t("We're working on this, but just want to let you know.") }</p>
         </div>
-        <SpaceFeedbackPrompt />
     </div>;
 };
 
@@ -626,7 +607,7 @@ const SpaceSetupPrivateInvite = ({ space, onFinished }) => {
     const numFields = 3;
     const fieldRefs: RefObject<Field>[] = [useRef(), useRef(), useRef()];
     const [emailAddresses, setEmailAddress] = useStateArray(numFields, "");
-    const fields = new Array(numFields).fill(0).map((_, i) => {
+    const fields = new Array(numFields).fill(0).map((x, i) => {
         const name = "emailAddress" + i;
         return <Field
             key={name}
@@ -731,7 +712,6 @@ const SpaceSetupPrivateInvite = ({ space, onFinished }) => {
                 value={buttonLabel}
             />
         </div>
-        <SpaceFeedbackPrompt />
     </div>;
 };
 
@@ -854,7 +834,7 @@ export default class SpaceRoomView extends React.PureComponent<IProps, IState> {
     private renderBody() {
         switch (this.state.phase) {
             case Phase.Landing:
-                if (this.state.myMembership === "join" && SettingsStore.getValue("feature_spaces")) {
+                if (this.state.myMembership === "join" && SpaceStore.spacesEnabled) {
                     return <SpaceLanding space={this.props.space} />;
                 } else {
                     return <SpacePreview

src/components/structures/TabbedView.tsx

@@ -74,7 +74,7 @@ export default class TabbedView extends React.Component<IProps, IState> {
         tabLocation: TabLocation.LEFT,
     };
 
-    private _getActiveTabIndex() {
+    private getActiveTabIndex() {
         if (!this.state || !this.state.activeTabIndex) return 0;
         return this.state.activeTabIndex;
     }
@@ -84,7 +84,7 @@ export default class TabbedView extends React.Component<IProps, IState> {
      * @param {Tab} tab the tab to show
      * @private
      */
-    private _setActiveTab(tab: Tab) {
+    private setActiveTab(tab: Tab) {
         const idx = this.props.tabs.indexOf(tab);
         if (idx !== -1) {
             if (this.props.onChange) this.props.onChange(tab.id);
@@ -94,23 +94,23 @@ export default class TabbedView extends React.Component<IProps, IState> {
         }
     }
 
-    private _renderTabLabel(tab: Tab) {
+    private renderTabLabel(tab: Tab) {
         let classes = "mx_TabbedView_tabLabel ";
 
         const idx = this.props.tabs.indexOf(tab);
-        if (idx === this._getActiveTabIndex()) classes += "mx_TabbedView_tabLabel_active";
+        if (idx === this.getActiveTabIndex()) classes += "mx_TabbedView_tabLabel_active";
 
         let tabIcon = null;
         if (tab.icon) {
             tabIcon = <span className={`mx_TabbedView_maskedIcon ${tab.icon}`} />;
         }
 
-        const onClickHandler = () => this._setActiveTab(tab);
+        const onClickHandler = () => this.setActiveTab(tab);
 
         const label = _t(tab.label);
         return (
             <AccessibleButton className={classes} key={"tab_label_" + tab.label} onClick={onClickHandler}>
-                {tabIcon}
+                { tabIcon }
                 <span className="mx_TabbedView_tabLabel_text">
                     { label }
                 </span>
@@ -118,19 +118,19 @@ export default class TabbedView extends React.Component<IProps, IState> {
         );
     }
 
-    private _renderTabPanel(tab: Tab): React.ReactNode {
+    private renderTabPanel(tab: Tab): React.ReactNode {
         return (
             <div className="mx_TabbedView_tabPanel" key={"mx_tabpanel_" + tab.label}>
                 <AutoHideScrollbar className='mx_TabbedView_tabPanelContent'>
-                    {tab.body}
+                    { tab.body }
                 </AutoHideScrollbar>
             </div>
         );
     }
 
     public render(): React.ReactNode {
-        const labels = this.props.tabs.map(tab => this._renderTabLabel(tab));
-        const panel = this._renderTabPanel(this.props.tabs[this._getActiveTabIndex()]);
+        const labels = this.props.tabs.map(tab => this.renderTabLabel(tab));
+        const panel = this.renderTabPanel(this.props.tabs[this.getActiveTabIndex()]);
 
         const tabbedViewClasses = classNames({
             'mx_TabbedView': true,
@@ -141,9 +141,9 @@ export default class TabbedView extends React.Component<IProps, IState> {
         return (
             <div className={tabbedViewClasses}>
                 <div className="mx_TabbedView_tabLabels">
-                    {labels}
+                    { labels }
                 </div>
-                {panel}
+                { panel }
             </div>
         );
     }

src/components/structures/TimelinePanel.tsx

@@ -277,7 +277,7 @@ class TimelinePanel extends React.Component<IProps, IState> {
     }
 
     // TODO: [REACT-WARNING] Move into constructor
-    // eslint-disable-next-line camelcase
+    // eslint-disable-next-line
     UNSAFE_componentWillMount() {
         if (this.props.manageReadReceipts) {
             this.updateReadReceiptOnUserActivity();
@@ -290,7 +290,7 @@ class TimelinePanel extends React.Component<IProps, IState> {
     }
 
     // TODO: [REACT-WARNING] Replace with appropriate lifecycle event
-    // eslint-disable-next-line camelcase
+    // eslint-disable-next-line
     UNSAFE_componentWillReceiveProps(newProps) {
         if (newProps.timelineSet !== this.props.timelineSet) {
             // throw new Error("changing timelineSet on a TimelinePanel is not supported");
@@ -555,9 +555,8 @@ class TimelinePanel extends React.Component<IProps, IState> {
                 // more than the timeout on userActiveRecently.
                 //
                 const myUserId = MatrixClientPeg.get().credentials.userId;
-                const sender = ev.sender ? ev.sender.userId : null;
                 callRMUpdated = false;
-                if (sender != myUserId && !UserActivity.sharedInstance().userActiveRecently()) {
+                if (ev.getSender() !== myUserId && !UserActivity.sharedInstance().userActiveRecently()) {
                     updatedState.readMarkerVisible = true;
                 } else if (lastLiveEvent && this.getReadMarkerPosition() === 0) {
                     // we know we're stuckAtBottom, so we can advance the RM
@@ -666,8 +665,8 @@ class TimelinePanel extends React.Component<IProps, IState> {
 
     private readMarkerTimeout(readMarkerPosition: number): number {
         return readMarkerPosition === 0 ?
-            this.state.readMarkerInViewThresholdMs :
-            this.state.readMarkerOutOfViewThresholdMs;
+            this.context?.readMarkerInViewThresholdMs ?? this.state.readMarkerInViewThresholdMs :
+            this.context?.readMarkerOutOfViewThresholdMs ?? this.state.readMarkerOutOfViewThresholdMs;
     }
 
     private async updateReadMarkerOnUserActivity(): Promise<void> {
@@ -758,16 +757,20 @@ class TimelinePanel extends React.Component<IProps, IState> {
             }
             this.lastRMSentEventId = this.state.readMarkerEventId;
 
+            const roomId = this.props.timelineSet.room.roomId;
+            const hiddenRR = SettingsStore.getValue("feature_hidden_read_receipts", roomId);
+
             debuglog('TimelinePanel: Sending Read Markers for ',
                 this.props.timelineSet.room.roomId,
                 'rm', this.state.readMarkerEventId,
                 lastReadEvent ? 'rr ' + lastReadEvent.getId() : '',
+                ' hidden:' + hiddenRR,
             );
             MatrixClientPeg.get().setRoomReadMarkers(
-                this.props.timelineSet.room.roomId,
+                roomId,
                 this.state.readMarkerEventId,
                 lastReadEvent, // Could be null, in which case no RR is sent
-                {},
+                { hidden: hiddenRR },
             ).catch((e) => {
                 // /read_markers API is not implemented on this HS, fallback to just RR
                 if (e.errcode === 'M_UNRECOGNIZED' && lastReadEvent) {
@@ -863,7 +866,7 @@ class TimelinePanel extends React.Component<IProps, IState> {
         const myUserId = MatrixClientPeg.get().credentials.userId;
         for (i++; i < events.length; i++) {
             const ev = events[i];
-            if (!ev.sender || ev.sender.userId != myUserId) {
+            if (ev.getSender() !== myUserId) {
                 break;
             }
         }
@@ -1051,6 +1054,8 @@ class TimelinePanel extends React.Component<IProps, IState> {
             { windowLimit: this.props.timelineCap });
 
         const onLoaded = () => {
+            if (this.unmounted) return;
+
             // clear the timeline min-height when
             // (re)loading the timeline
             if (this.messagePanel.current) {
@@ -1092,6 +1097,8 @@ class TimelinePanel extends React.Component<IProps, IState> {
         };
 
         const onError = (error) => {
+            if (this.unmounted) return;
+
             this.setState({ timelineLoading: false });
             console.error(
                 `Error loading timeline panel at ${eventId}: ${error}`,
@@ -1333,8 +1340,9 @@ class TimelinePanel extends React.Component<IProps, IState> {
             }
 
             const shouldIgnore = !!ev.status || // local echo
-                (ignoreOwn && ev.sender && ev.sender.userId == myUserId);   // own message
-            const isWithoutTile = !haveTileForEvent(ev) || shouldHideEvent(ev, this.context);
+                (ignoreOwn && ev.getSender() === myUserId); // own message
+            const isWithoutTile = !haveTileForEvent(ev, this.context?.showHiddenEventsInTimeline) ||
+                shouldHideEvent(ev, this.context);
 
             if (isWithoutTile || !node) {
                 // don't start counting if the event should be ignored,
@@ -1444,7 +1452,7 @@ class TimelinePanel extends React.Component<IProps, IState> {
         if (this.state.events.length == 0 && !this.state.canBackPaginate && this.props.empty) {
             return (
                 <div className={this.props.className + " mx_RoomView_messageListWrapper"}>
-                    <div className="mx_RoomView_empty">{this.props.empty}</div>
+                    <div className="mx_RoomView_empty">{ this.props.empty }</div>
                 </div>
             );
         }
@@ -1489,8 +1497,12 @@ class TimelinePanel extends React.Component<IProps, IState> {
                 onUserScroll={this.props.onUserScroll}
                 onFillRequest={this.onMessageListFillRequest}
                 onUnfillRequest={this.onMessageListUnfillRequest}
-                isTwelveHour={this.state.isTwelveHour}
-                alwaysShowTimestamps={this.props.alwaysShowTimestamps || this.state.alwaysShowTimestamps}
+                isTwelveHour={this.context?.showTwelveHourTimestamps ?? this.state.isTwelveHour}
+                alwaysShowTimestamps={
+                    this.props.alwaysShowTimestamps ??
+                    this.context?.alwaysShowTimestamps ??
+                    this.state.alwaysShowTimestamps
+                }
                 className={this.props.className}
                 tileShape={this.props.tileShape}
                 resizeNotifier={this.props.resizeNotifier}

src/components/structures/ToastContainer.tsx

@@ -37,14 +37,14 @@ export default class ToastContainer extends React.Component<{}, IState> {
         // toasts may dismiss themselves in their didMount if they find
         // they're already irrelevant by the time they're mounted, and
         // our own componentDidMount is too late.
-        ToastStore.sharedInstance().on('update', this._onToastStoreUpdate);
+        ToastStore.sharedInstance().on('update', this.onToastStoreUpdate);
     }
 
     componentWillUnmount() {
-        ToastStore.sharedInstance().removeListener('update', this._onToastStoreUpdate);
+        ToastStore.sharedInstance().removeListener('update', this.onToastStoreUpdate);
     }
 
-    _onToastStoreUpdate = () => {
+    private onToastStoreUpdate = () => {
         this.setState({
             toasts: ToastStore.sharedInstance().getToasts(),
             countSeen: ToastStore.sharedInstance().getCountSeen(),
@@ -58,28 +58,39 @@ export default class ToastContainer extends React.Component<{}, IState> {
         let containerClasses;
         if (totalCount !== 0) {
             const topToast = this.state.toasts[0];
-            const { title, icon, key, component, className, props } = topToast;
-            const toastClasses = classNames("mx_Toast_toast", {
+            const { title, icon, key, component, className, bodyClassName, props } = topToast;
+            const bodyClasses = classNames("mx_Toast_body", bodyClassName);
+            const toastClasses = classNames("mx_Toast_toast", className, {
                 "mx_Toast_hasIcon": icon,
                 [`mx_Toast_icon_${icon}`]: icon,
-            }, className);
-
-            let countIndicator;
-            if (isStacked || this.state.countSeen > 0) {
-                countIndicator = ` (${this.state.countSeen + 1}/${this.state.countSeen + totalCount})`;
-            }
-
+            });
             const toastProps = Object.assign({}, props, {
                 key,
                 toastKey: key,
             });
-            toast = (<div className={toastClasses}>
-                <div className="mx_Toast_title">
-                    <h2>{title}</h2>
-                    <span>{countIndicator}</span>
+            const content = React.createElement(component, toastProps);
+
+            let countIndicator;
+            if (title && isStacked || this.state.countSeen > 0) {
+                countIndicator = ` (${this.state.countSeen + 1}/${this.state.countSeen + totalCount})`;
+            }
+
+            let titleElement;
+            if (title) {
+                titleElement = (
+                    <div className="mx_Toast_title">
+                        <h2>{ title }</h2>
+                        <span>{ countIndicator }</span>
+                    </div>
+                );
+            }
+
+            toast = (
+                <div className={toastClasses}>
+                    { titleElement }
+                    <div className={bodyClasses}>{ content }</div>
                 </div>
-                <div className="mx_Toast_body">{React.createElement(component, toastProps)}</div>
-            </div>);
+            );
 
             containerClasses = classNames("mx_ToastContainer", {
                 "mx_ToastContainer_stacked": isStacked,
@@ -88,7 +99,7 @@ export default class ToastContainer extends React.Component<{}, IState> {
         return toast
             ? (
                 <div className={containerClasses} role="alert">
-                    {toast}
+                    { toast }
                 </div>
             )
             : null;

src/components/structures/UploadBar.tsx

@@ -104,7 +104,7 @@ export default class UploadBar extends React.Component<IProps, IState> {
         const uploadSize = filesize(this.state.currentUpload.total);
         return (
             <div className="mx_UploadBar">
-                <div className="mx_UploadBar_filename">{uploadText} ({uploadSize})</div>
+                <div className="mx_UploadBar_filename">{ uploadText } ({ uploadSize })</div>
                 <AccessibleButton onClick={this.onCancelClick} className='mx_UploadBar_cancel' />
                 <ProgressBar value={this.state.currentUpload.loaded} max={this.state.currentUpload.total} />
             </div>

src/components/structures/UserMenu.tsx

@@ -90,7 +90,7 @@ export default class UserMenu extends React.Component<IProps, IState> {
         };
 
         OwnProfileStore.instance.on(UPDATE_EVENT, this.onProfileUpdate);
-        if (SettingsStore.getValue("feature_spaces")) {
+        if (SpaceStore.spacesEnabled) {
             SpaceStore.instance.on(UPDATE_SELECTED_SPACE, this.onSelectedSpaceUpdate);
         }
 
@@ -115,7 +115,7 @@ export default class UserMenu extends React.Component<IProps, IState> {
         if (this.dispatcherRef) defaultDispatcher.unregister(this.dispatcherRef);
         OwnProfileStore.instance.off(UPDATE_EVENT, this.onProfileUpdate);
         this.tagStoreRef.remove();
-        if (SettingsStore.getValue("feature_spaces")) {
+        if (SpaceStore.spacesEnabled) {
             SpaceStore.instance.off(UPDATE_SELECTED_SPACE, this.onSelectedSpaceUpdate);
         }
         MatrixClientPeg.get().removeListener("Room", this.onRoom);
@@ -342,20 +342,20 @@ export default class UserMenu extends React.Component<IProps, IState> {
         if (MatrixClientPeg.get().isGuest()) {
             topSection = (
                 <div className="mx_UserMenu_contextMenu_header mx_UserMenu_contextMenu_guestPrompts">
-                    {_t("Got an account? <a>Sign in</a>", {}, {
+                    { _t("Got an account? <a>Sign in</a>", {}, {
                         a: sub => (
                             <AccessibleButton kind="link" onClick={this.onSignInClick}>
-                                {sub}
+                                { sub }
                             </AccessibleButton>
                         ),
-                    })}
-                    {_t("New here? <a>Create an account</a>", {}, {
+                    }) }
+                    { _t("New here? <a>Create an account</a>", {}, {
                         a: sub => (
                             <AccessibleButton kind="link" onClick={this.onRegisterClick}>
-                                {sub}
+                                { sub }
                             </AccessibleButton>
                         ),
-                    })}
+                    }) }
                 </div>
             );
         } else if (hostSignupConfig) {
@@ -394,17 +394,17 @@ export default class UserMenu extends React.Component<IProps, IState> {
         let primaryHeader = (
             <div className="mx_UserMenu_contextMenu_name">
                 <span className="mx_UserMenu_contextMenu_displayName">
-                    {OwnProfileStore.instance.displayName}
+                    { OwnProfileStore.instance.displayName }
                 </span>
                 <span className="mx_UserMenu_contextMenu_userId">
-                    {MatrixClientPeg.get().getUserId()}
+                    { MatrixClientPeg.get().getUserId() }
                 </span>
             </div>
         );
         let primaryOptionList = (
             <React.Fragment>
                 <IconizedContextMenuOptionList>
-                    {homeButton}
+                    { homeButton }
                     <IconizedContextMenuOption
                         iconClassName="mx_UserMenu_iconBell"
                         label={_t("Notification settings")}
@@ -420,11 +420,11 @@ export default class UserMenu extends React.Component<IProps, IState> {
                         label={_t("All settings")}
                         onClick={(e) => this.onSettingsOpen(e, null)}
                     />
-                    {/* <IconizedContextMenuOption
+                    { /* <IconizedContextMenuOption
                         iconClassName="mx_UserMenu_iconArchive"
                         label={_t("Archived rooms")}
                         onClick={this.onShowArchived}
-                    /> */}
+                    /> */ }
                     { feedbackButton }
                 </IconizedContextMenuOptionList>
                 <IconizedContextMenuOptionList red>
@@ -443,7 +443,7 @@ export default class UserMenu extends React.Component<IProps, IState> {
             primaryHeader = (
                 <div className="mx_UserMenu_contextMenu_name">
                     <span className="mx_UserMenu_contextMenu_displayName">
-                        {prototypeCommunityName}
+                        { prototypeCommunityName }
                     </span>
                 </div>
             );
@@ -470,13 +470,13 @@ export default class UserMenu extends React.Component<IProps, IState> {
             }
             primaryOptionList = (
                 <IconizedContextMenuOptionList>
-                    {settingsOption}
+                    { settingsOption }
                     <IconizedContextMenuOption
                         iconClassName="mx_UserMenu_iconMembers"
                         label={_t("Members")}
                         onClick={this.onCommunityMembersClick}
                     />
-                    {inviteOption}
+                    { inviteOption }
                 </IconizedContextMenuOptionList>
             );
             secondarySection = (
@@ -485,10 +485,10 @@ export default class UserMenu extends React.Component<IProps, IState> {
                     <div className="mx_UserMenu_contextMenu_header">
                         <div className="mx_UserMenu_contextMenu_name">
                             <span className="mx_UserMenu_contextMenu_displayName">
-                                {OwnProfileStore.instance.displayName}
+                                { OwnProfileStore.instance.displayName }
                             </span>
                             <span className="mx_UserMenu_contextMenu_userId">
-                                {MatrixClientPeg.get().getUserId()}
+                                { MatrixClientPeg.get().getUserId() }
                             </span>
                         </div>
                     </div>
@@ -540,7 +540,7 @@ export default class UserMenu extends React.Component<IProps, IState> {
             className={classes}
         >
             <div className="mx_UserMenu_contextMenu_header">
-                {primaryHeader}
+                { primaryHeader }
                 <AccessibleTooltipButton
                     className="mx_UserMenu_contextMenu_themeButton"
                     onClick={this.onSwitchThemeClick}
@@ -553,9 +553,9 @@ export default class UserMenu extends React.Component<IProps, IState> {
                     />
                 </AccessibleTooltipButton>
             </div>
-            {topSection}
-            {primaryOptionList}
-            {secondarySection}
+            { topSection }
+            { primaryOptionList }
+            { secondarySection }
         </IconizedContextMenu>;
     };
 
@@ -570,27 +570,27 @@ export default class UserMenu extends React.Component<IProps, IState> {
 
         let isPrototype = false;
         let menuName = _t("User menu");
-        let name = <span className="mx_UserMenu_userName">{displayName}</span>;
+        let name = <span className="mx_UserMenu_userName">{ displayName }</span>;
         let buttons = (
             <span className="mx_UserMenu_headerButtons">
-                {/* masked image in CSS */}
+                { /* masked image in CSS */ }
             </span>
         );
         let dnd;
         if (this.state.selectedSpace) {
             name = (
                 <div className="mx_UserMenu_doubleName">
-                    <span className="mx_UserMenu_userName">{displayName}</span>
+                    <span className="mx_UserMenu_userName">{ displayName }</span>
                     <RoomName room={this.state.selectedSpace}>
-                        {(roomName) => <span className="mx_UserMenu_subUserName">{roomName}</span>}
+                        { (roomName) => <span className="mx_UserMenu_subUserName">{ roomName }</span> }
                     </RoomName>
                 </div>
             );
         } else if (prototypeCommunityName) {
             name = (
                 <div className="mx_UserMenu_doubleName">
-                    <span className="mx_UserMenu_userName">{prototypeCommunityName}</span>
-                    <span className="mx_UserMenu_subUserName">{displayName}</span>
+                    <span className="mx_UserMenu_userName">{ prototypeCommunityName }</span>
+                    <span className="mx_UserMenu_subUserName">{ displayName }</span>
                 </div>
             );
             menuName = _t("Community and user menu");
@@ -598,8 +598,8 @@ export default class UserMenu extends React.Component<IProps, IState> {
         } else if (SettingsStore.getValue("feature_communities_v2_prototypes")) {
             name = (
                 <div className="mx_UserMenu_doubleName">
-                    <span className="mx_UserMenu_userName">{_t("Home")}</span>
-                    <span className="mx_UserMenu_subUserName">{displayName}</span>
+                    <span className="mx_UserMenu_userName">{ _t("Home") }</span>
+                    <span className="mx_UserMenu_subUserName">{ displayName }</span>
                 </div>
             );
             isPrototype = true;
@@ -647,20 +647,20 @@ export default class UserMenu extends React.Component<IProps, IState> {
                                 className="mx_UserMenu_userAvatar"
                             />
                         </span>
-                        {name}
-                        {this.state.pendingRoomJoin.size > 0 && (
+                        { name }
+                        { this.state.pendingRoomJoin.size > 0 && (
                             <InlineSpinner>
                                 <TooltipButton helpText={_t(
                                     "Currently joining %(count)s rooms",
                                     { count: this.state.pendingRoomJoin.size },
                                 )} />
                             </InlineSpinner>
-                        )}
-                        {dnd}
-                        {buttons}
+                        ) }
+                        { dnd }
+                        { buttons }
                     </div>
                 </ContextMenuButton>
-                {this.renderContextMenu()}
+                { this.renderContextMenu() }
             </React.Fragment>
         );
     }

src/components/structures/ViewSource.js

@@ -63,23 +63,23 @@ export default class ViewSource extends React.Component {
                 <>
                     <details open className="mx_ViewSource_details">
                         <summary>
-                            <span className="mx_ViewSource_heading">{_t("Decrypted event source")}</span>
+                            <span className="mx_ViewSource_heading">{ _t("Decrypted event source") }</span>
                         </summary>
-                        <SyntaxHighlight className="json">{JSON.stringify(decryptedEventSource, null, 2)}</SyntaxHighlight>
+                        <SyntaxHighlight className="json">{ JSON.stringify(decryptedEventSource, null, 2) }</SyntaxHighlight>
                     </details>
                     <details className="mx_ViewSource_details">
                         <summary>
-                            <span className="mx_ViewSource_heading">{_t("Original event source")}</span>
+                            <span className="mx_ViewSource_heading">{ _t("Original event source") }</span>
                         </summary>
-                        <SyntaxHighlight className="json">{JSON.stringify(originalEventSource, null, 2)}</SyntaxHighlight>
+                        <SyntaxHighlight className="json">{ JSON.stringify(originalEventSource, null, 2) }</SyntaxHighlight>
                     </details>
                 </>
             );
         } else {
             return (
                 <>
-                    <div className="mx_ViewSource_heading">{_t("Original event source")}</div>
-                    <SyntaxHighlight className="json">{JSON.stringify(originalEventSource, null, 2)}</SyntaxHighlight>
+                    <div className="mx_ViewSource_heading">{ _t("Original event source") }</div>
+                    <SyntaxHighlight className="json">{ JSON.stringify(originalEventSource, null, 2) }</SyntaxHighlight>
                 </>
             );
         }
@@ -110,7 +110,7 @@ export default class ViewSource extends React.Component {
         if (isStateEvent) {
             return (
                 <MatrixClientContext.Consumer>
-                    {(cli) => (
+                    { (cli) => (
                         <SendCustomEvent
                             room={cli.getRoom(roomId)}
                             forceStateEvent={true}
@@ -121,7 +121,7 @@ export default class ViewSource extends React.Component {
                                 stateKey: mxEvent.getStateKey(),
                             }}
                         />
-                    )}
+                    ) }
                 </MatrixClientContext.Consumer>
             );
         } else {
@@ -142,7 +142,7 @@ export default class ViewSource extends React.Component {
             };
             return (
                 <MatrixClientContext.Consumer>
-                    {(cli) => (
+                    { (cli) => (
                         <SendCustomEvent
                             room={cli.getRoom(roomId)}
                             forceStateEvent={false}
@@ -153,7 +153,7 @@ export default class ViewSource extends React.Component {
                                 evContent: JSON.stringify(newContent, null, "\t"),
                             }}
                         />
-                    )}
+                    ) }
                 </MatrixClientContext.Consumer>
             );
         }
@@ -176,16 +176,16 @@ export default class ViewSource extends React.Component {
         return (
             <BaseDialog className="mx_ViewSource" onFinished={this.props.onFinished} title={_t("View Source")}>
                 <div>
-                    <div>Room ID: {roomId}</div>
-                    <div>Event ID: {eventId}</div>
+                    <div>Room ID: { roomId }</div>
+                    <div>Event ID: { eventId }</div>
                     <div className="mx_ViewSource_separator" />
-                    {isEditing ? this.editSourceContent() : this.viewSourceContent()}
+                    { isEditing ? this.editSourceContent() : this.viewSourceContent() }
                 </div>
-                {!isEditing && canEdit && (
+                { !isEditing && canEdit && (
                     <div className="mx_Dialog_buttons">
-                        <button onClick={() => this.onEdit()}>{_t("Edit")}</button>
+                        <button onClick={() => this.onEdit()}>{ _t("Edit") }</button>
                     </div>
-                )}
+                ) }
             </BaseDialog>
         );
     }

src/components/structures/auth/CompleteSecurity.tsx

@@ -79,8 +79,8 @@ export default class CompleteSecurity extends React.Component<IProps, IState> {
             <AuthPage>
                 <CompleteSecurityBody>
                     <h2 className="mx_CompleteSecurity_header">
-                        {icon}
-                        {title}
+                        { icon }
+                        { title }
                     </h2>
                     <div className="mx_CompleteSecurity_body">
                         <SetupEncryptionBody onFinished={this.props.onFinished} />

src/components/structures/auth/ForgotPassword.tsx

@@ -101,7 +101,7 @@ export default class ForgotPassword extends React.Component<IProps, IState> {
     }
 
     // TODO: [REACT-WARNING] Replace with appropriate lifecycle event
-    // eslint-disable-next-line camelcase
+    // eslint-disable-next-line
     public UNSAFE_componentWillReceiveProps(newProps: IProps): void {
         if (newProps.serverConfig.hsUrl === this.props.serverConfig.hsUrl &&
             newProps.serverConfig.isUrl === this.props.serverConfig.isUrl) return;
@@ -239,14 +239,14 @@ export default class ForgotPassword extends React.Component<IProps, IState> {
             });
             serverDeadSection = (
                 <div className={classes}>
-                    {this.state.serverDeadError}
+                    { this.state.serverDeadError }
                 </div>
             );
         }
 
         return <div>
-            {errorText}
-            {serverDeadSection}
+            { errorText }
+            { serverDeadSection }
             <ServerPicker
                 serverConfig={this.props.serverConfig}
                 onServerConfigChange={this.props.onServerConfigChange}
@@ -289,10 +289,10 @@ export default class ForgotPassword extends React.Component<IProps, IState> {
                         autoComplete="new-password"
                     />
                 </div>
-                <span>{_t(
+                <span>{ _t(
                     'A verification email will be sent to your inbox to confirm ' +
                     'setting your new password.',
-                )}</span>
+                ) }</span>
                 <input
                     className="mx_Login_submit"
                     type="submit"
@@ -300,7 +300,7 @@ export default class ForgotPassword extends React.Component<IProps, IState> {
                 />
             </form>
             <a className="mx_AuthBody_changeFlow" onClick={this.onLoginClick} href="#">
-                {_t('Sign in instead')}
+                { _t('Sign in instead') }
             </a>
         </div>;
     }
@@ -312,23 +312,29 @@ export default class ForgotPassword extends React.Component<IProps, IState> {
 
     renderEmailSent() {
         return <div>
-            {_t("An email has been sent to %(emailAddress)s. Once you've followed the " +
-                "link it contains, click below.", { emailAddress: this.state.email })}
+            { _t("An email has been sent to %(emailAddress)s. Once you've followed the " +
+                "link it contains, click below.", { emailAddress: this.state.email }) }
             <br />
-            <input className="mx_Login_submit" type="button" onClick={this.onVerify}
+            <input
+                className="mx_Login_submit"
+                type="button"
+                onClick={this.onVerify}
                 value={_t('I have verified my email address')} />
         </div>;
     }
 
     renderDone() {
         return <div>
-            <p>{_t("Your password has been reset.")}</p>
-            <p>{_t(
+            <p>{ _t("Your password has been reset.") }</p>
+            <p>{ _t(
                 "You have been logged out of all sessions and will no longer receive " +
                 "push notifications. To re-enable notifications, sign in again on each " +
                 "device.",
-            )}</p>
-            <input className="mx_Login_submit" type="button" onClick={this.props.onComplete}
+            ) }</p>
+            <input
+                className="mx_Login_submit"
+                type="button"
+                onClick={this.props.onComplete}
                 value={_t('Return to login screen')} />
         </div>;
     }
@@ -358,7 +364,7 @@ export default class ForgotPassword extends React.Component<IProps, IState> {
                 <AuthHeader />
                 <AuthBody>
                     <h2> { _t('Set a new password') } </h2>
-                    {resetPasswordJsx}
+                    { resetPasswordJsx }
                 </AuthBody>
             </AuthPage>
         );

src/components/structures/auth/Login.tsx

@@ -144,7 +144,7 @@ export default class LoginComponent extends React.PureComponent<IProps, IState>
     }
 
     // TODO: [REACT-WARNING] Replace with appropriate lifecycle event
-    // eslint-disable-next-line camelcase
+    // eslint-disable-next-line
     UNSAFE_componentWillMount() {
         this.initLoginLogic(this.props.serverConfig);
     }
@@ -154,7 +154,7 @@ export default class LoginComponent extends React.PureComponent<IProps, IState>
     }
 
     // TODO: [REACT-WARNING] Replace with appropriate lifecycle event
-    // eslint-disable-next-line camelcase
+    // eslint-disable-next-line
     UNSAFE_componentWillReceiveProps(newProps) {
         if (newProps.serverConfig.hsUrl === this.props.serverConfig.hsUrl &&
             newProps.serverConfig.isUrl === this.props.serverConfig.isUrl) return;
@@ -239,8 +239,8 @@ export default class LoginComponent extends React.PureComponent<IProps, IState>
                 );
                 errorText = (
                     <div>
-                        <div>{errorTop}</div>
-                        <div className="mx_Login_smallError">{errorDetail}</div>
+                        <div>{ errorTop }</div>
+                        <div className="mx_Login_smallError">{ errorDetail }</div>
                     </div>
                 );
             } else if (error.httpStatus === 401 || error.httpStatus === 403) {
@@ -251,10 +251,10 @@ export default class LoginComponent extends React.PureComponent<IProps, IState>
                         <div>
                             <div>{ _t('Incorrect username and/or password.') }</div>
                             <div className="mx_Login_smallError">
-                                {_t(
+                                { _t(
                                     'Please note you are logging into the %(hs)s server, not matrix.org.',
                                     { hs: this.props.serverConfig.hsName },
-                                )}
+                                ) }
                             </div>
                         </div>
                     );
@@ -463,7 +463,9 @@ export default class LoginComponent extends React.PureComponent<IProps, IState>
                         "Either use HTTPS or <a>enable unsafe scripts</a>.", {},
                     {
                         'a': (sub) => {
-                            return <a target="_blank" rel="noreferrer noopener"
+                            return <a
+                                target="_blank"
+                                rel="noreferrer noopener"
                                 href="https://www.google.com/search?&q=enable%20unsafe%20scripts"
                             >
                                 { sub }
@@ -565,7 +567,7 @@ export default class LoginComponent extends React.PureComponent<IProps, IState>
             });
             serverDeadSection = (
                 <div className={classes}>
-                    {this.state.serverDeadError}
+                    { this.state.serverDeadError }
                 </div>
             );
         }
@@ -578,15 +580,15 @@ export default class LoginComponent extends React.PureComponent<IProps, IState>
                     { this.props.isSyncing ? _t("Syncing...") : _t("Signing In...") }
                 </div>
                 { this.props.isSyncing && <div className="mx_AuthBody_paddedFooter_subtitle">
-                    {_t("If you've joined lots of rooms, this might take a while")}
+                    { _t("If you've joined lots of rooms, this might take a while") }
                 </div> }
             </div>;
         } else if (SettingsStore.getValue(UIFeature.Registration)) {
             footer = (
                 <span className="mx_AuthBody_changeFlow">
-                    {_t("New? <a>Create account</a>", {}, {
+                    { _t("New? <a>Create account</a>", {}, {
                         a: sub => <a onClick={this.onTryRegisterClick} href="#">{ sub }</a>,
-                    })}
+                    }) }
                 </span>
             );
         }
@@ -596,8 +598,8 @@ export default class LoginComponent extends React.PureComponent<IProps, IState>
                 <AuthHeader disableLanguageSelector={this.props.isSyncing || this.state.busyLoggingIn} />
                 <AuthBody>
                     <h2>
-                        {_t('Sign in')}
-                        {loader}
+                        { _t('Sign in') }
+                        { loader }
                     </h2>
                     { errorTextSection }
                     { serverDeadSection }

src/components/structures/auth/Registration.tsx

@@ -141,7 +141,7 @@ export default class Registration extends React.Component<IProps, IState> {
     }
 
     // TODO: [REACT-WARNING] Replace with appropriate lifecycle event
-    // eslint-disable-next-line camelcase
+    // eslint-disable-next-line
     UNSAFE_componentWillReceiveProps(newProps) {
         if (newProps.serverConfig.hsUrl === this.props.serverConfig.hsUrl &&
             newProps.serverConfig.isUrl === this.props.serverConfig.isUrl) return;
@@ -290,8 +290,8 @@ export default class Registration extends React.Component<IProps, IState> {
                     },
                 );
                 msg = <div>
-                    <p>{errorTop}</p>
-                    <p>{errorDetail}</p>
+                    <p>{ errorTop }</p>
+                    <p>{ errorDetail }</p>
                 </div>;
             } else if (response.required_stages && response.required_stages.indexOf('m.login.msisdn') > -1) {
                 let msisdnAvailable = false;
@@ -482,13 +482,13 @@ export default class Registration extends React.Component<IProps, IState> {
                         fragmentAfterLogin={this.props.fragmentAfterLogin}
                     />
                     <h3 className="mx_AuthBody_centered">
-                        {_t(
+                        { _t(
                             "%(ssoButtons)s Or %(usernamePassword)s",
                             {
                                 ssoButtons: "",
                                 usernamePassword: "",
                             },
-                        ).trim()}
+                        ).trim() }
                     </h3>
                 </React.Fragment>;
             }
@@ -526,15 +526,15 @@ export default class Registration extends React.Component<IProps, IState> {
             });
             serverDeadSection = (
                 <div className={classes}>
-                    {this.state.serverDeadError}
+                    { this.state.serverDeadError }
                 </div>
             );
         }
 
         const signIn = <span className="mx_AuthBody_changeFlow">
-            {_t("Already have an account? <a>Sign in here</a>", {}, {
+            { _t("Already have an account? <a>Sign in here</a>", {}, {
                 a: sub => <a onClick={this.onLoginClick} href="#">{ sub }</a>,
-            })}
+            }) }
         </span>;
 
         // Only show the 'go back' button if you're not looking at the form
@@ -550,43 +550,47 @@ export default class Registration extends React.Component<IProps, IState> {
             let regDoneText;
             if (this.state.differentLoggedInUserId) {
                 regDoneText = <div>
-                    <p>{_t(
+                    <p>{ _t(
                         "Your new account (%(newAccountId)s) is registered, but you're already " +
                         "logged into a different account (%(loggedInUserId)s).", {
                             newAccountId: this.state.registeredUsername,
                             loggedInUserId: this.state.differentLoggedInUserId,
                         },
-                    )}</p>
-                    <p><AccessibleButton element="span" className="mx_linkButton" onClick={async event => {
-                        const sessionLoaded = await this.onLoginClickWithCheck(event);
-                        if (sessionLoaded) {
-                            dis.dispatch({ action: "view_welcome_page" });
-                        }
-                    }}>
-                        {_t("Continue with previous account")}
+                    ) }</p>
+                    <p><AccessibleButton
+                        element="span"
+                        className="mx_linkButton"
+                        onClick={async event => {
+                            const sessionLoaded = await this.onLoginClickWithCheck(event);
+                            if (sessionLoaded) {
+                                dis.dispatch({ action: "view_welcome_page" });
+                            }
+                        }}
+                    >
+                        { _t("Continue with previous account") }
                     </AccessibleButton></p>
                 </div>;
             } else if (this.state.formVals.password) {
                 // We're the client that started the registration
-                regDoneText = <h3>{_t(
+                regDoneText = <h3>{ _t(
                     "<a>Log in</a> to your new account.", {},
                     {
-                        a: (sub) => <a href="#/login" onClick={this.onLoginClickWithCheck}>{sub}</a>,
+                        a: (sub) => <a href="#/login" onClick={this.onLoginClickWithCheck}>{ sub }</a>,
                     },
-                )}</h3>;
+                ) }</h3>;
             } else {
                 // We're not the original client: the user probably got to us by clicking the
                 // email validation link. We can't offer a 'go straight to your account' link
                 // as we don't have the original creds.
-                regDoneText = <h3>{_t(
+                regDoneText = <h3>{ _t(
                     "You can now close this window or <a>log in</a> to your new account.", {},
                     {
-                        a: (sub) => <a href="#/login" onClick={this.onLoginClickWithCheck}>{sub}</a>,
+                        a: (sub) => <a href="#/login" onClick={this.onLoginClickWithCheck}>{ sub }</a>,
                     },
-                )}</h3>;
+                ) }</h3>;
             }
             body = <div>
-                <h2>{_t("Registration Successful")}</h2>
+                <h2>{ _t("Registration Successful") }</h2>
                 { regDoneText }
             </div>;
         } else {

src/components/structures/auth/SetupEncryptionBody.tsx

@@ -152,7 +152,7 @@ export default class SetupEncryptionBody extends React.Component<IProps, IState>
             let useRecoveryKeyButton;
             if (recoveryKeyPrompt) {
                 useRecoveryKeyButton = <AccessibleButton kind="link" onClick={this.onUsePassphraseClick}>
-                    {recoveryKeyPrompt}
+                    { recoveryKeyPrompt }
                 </AccessibleButton>;
             }
 
@@ -165,15 +165,15 @@ export default class SetupEncryptionBody extends React.Component<IProps, IState>
 
             return (
                 <div>
-                    <p>{_t(
+                    <p>{ _t(
                         "Verify your identity to access encrypted messages and prove your identity to others.",
-                    )}</p>
+                    ) }</p>
 
                     <div className="mx_CompleteSecurity_actionRow">
-                        {verifyButton}
-                        {useRecoveryKeyButton}
+                        { verifyButton }
+                        { useRecoveryKeyButton }
                         <AccessibleButton kind="danger" onClick={this.onSkipClick}>
-                            {_t("Skip")}
+                            { _t("Skip") }
                         </AccessibleButton>
                     </div>
                 </div>
@@ -181,25 +181,25 @@ export default class SetupEncryptionBody extends React.Component<IProps, IState>
         } else if (phase === Phase.Done) {
             let message;
             if (this.state.backupInfo) {
-                message = <p>{_t(
+                message = <p>{ _t(
                     "Your new session is now verified. It has access to your " +
                     "encrypted messages, and other users will see it as trusted.",
-                )}</p>;
+                ) }</p>;
             } else {
-                message = <p>{_t(
+                message = <p>{ _t(
                     "Your new session is now verified. Other users will see it as trusted.",
-                )}</p>;
+                ) }</p>;
             }
             return (
                 <div>
                     <div className="mx_CompleteSecurity_heroIcon mx_E2EIcon_verified" />
-                    {message}
+                    { message }
                     <div className="mx_CompleteSecurity_actionRow">
                         <AccessibleButton
                             kind="primary"
                             onClick={this.onDoneClick}
                         >
-                            {_t("Done")}
+                            { _t("Done") }
                         </AccessibleButton>
                     </div>
                 </div>
@@ -207,23 +207,23 @@ export default class SetupEncryptionBody extends React.Component<IProps, IState>
         } else if (phase === Phase.ConfirmSkip) {
             return (
                 <div>
-                    <p>{_t(
+                    <p>{ _t(
                         "Without verifying, you won’t have access to all your messages " +
                         "and may appear as untrusted to others.",
-                    )}</p>
+                    ) }</p>
                     <div className="mx_CompleteSecurity_actionRow">
                         <AccessibleButton
                             className="warning"
                             kind="secondary"
                             onClick={this.onSkipConfirmClick}
                         >
-                            {_t("Skip")}
+                            { _t("Skip") }
                         </AccessibleButton>
                         <AccessibleButton
                             kind="danger"
                             onClick={this.onSkipBackClick}
                         >
-                            {_t("Go Back")}
+                            { _t("Go Back") }
                         </AccessibleButton>
                     </div>
                 </div>

src/components/structures/auth/SoftLogout.tsx

@@ -219,7 +219,7 @@ export default class SoftLogout extends React.Component<IProps, IState> {
         if (this.state.loginView === LOGIN_VIEW.PASSWORD) {
             let error = null;
             if (this.state.errorText) {
-                error = <span className='mx_Login_error'>{this.state.errorText}</span>;
+                error = <span className='mx_Login_error'>{ this.state.errorText }</span>;
             }
 
             if (!introText) {
@@ -228,8 +228,8 @@ export default class SoftLogout extends React.Component<IProps, IState> {
 
             return (
                 <form onSubmit={this.onPasswordLogin}>
-                    <p>{introText}</p>
-                    {error}
+                    <p>{ introText }</p>
+                    { error }
                     <Field
                         type="password"
                         label={_t("Password")}
@@ -243,10 +243,10 @@ export default class SoftLogout extends React.Component<IProps, IState> {
                         type="submit"
                         disabled={this.state.busy}
                     >
-                        {_t("Sign In")}
+                        { _t("Sign In") }
                     </AccessibleButton>
                     <AccessibleButton onClick={this.onForgotPassword} kind="link">
-                        {_t("Forgotten your password?")}
+                        { _t("Forgotten your password?") }
                     </AccessibleButton>
                 </form>
             );
@@ -262,7 +262,7 @@ export default class SoftLogout extends React.Component<IProps, IState> {
 
             return (
                 <div>
-                    <p>{introText}</p>
+                    <p>{ introText }</p>
                     <SSOButtons
                         matrixClient={MatrixClientPeg.get()}
                         flow={flow}
@@ -277,10 +277,10 @@ export default class SoftLogout extends React.Component<IProps, IState> {
         // Default: assume unsupported/error
         return (
             <p>
-                {_t(
+                { _t(
                     "You cannot sign in to your account. Please contact your " +
                     "homeserver admin for more information.",
-                )}
+                ) }
             </p>
         );
     }
@@ -291,25 +291,25 @@ export default class SoftLogout extends React.Component<IProps, IState> {
                 <AuthHeader />
                 <AuthBody>
                     <h2>
-                        {_t("You're signed out")}
+                        { _t("You're signed out") }
                     </h2>
 
-                    <h3>{_t("Sign in")}</h3>
+                    <h3>{ _t("Sign in") }</h3>
                     <div>
-                        {this.renderSignInSection()}
+                        { this.renderSignInSection() }
                     </div>
 
-                    <h3>{_t("Clear personal data")}</h3>
+                    <h3>{ _t("Clear personal data") }</h3>
                     <p>
-                        {_t(
+                        { _t(
                             "Warning: Your personal data (including encryption keys) is still stored " +
                             "in this session. Clear it if you're finished using this session, or want to sign " +
                             "in to another account.",
-                        )}
+                        ) }
                     </p>
                     <div>
                         <AccessibleButton onClick={this.onClearAll} kind="danger">
-                            {_t("Clear all data")}
+                            { _t("Clear all data") }
                         </AccessibleButton>
                     </div>
                 </AuthBody>

src/components/views/audio_messages/AudioPlayer.tsx

@@ -14,9 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import { Playback, PlaybackState } from "../../../voice/Playback";
 import React, { createRef, ReactNode, RefObject } from "react";
-import { UPDATE_EVENT } from "../../../stores/AsyncStore";
 import PlayPauseButton from "./PlayPauseButton";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 import { formatBytes } from "../../../utils/FormattingUtils";
@@ -25,44 +23,13 @@ import { Key } from "../../../Keyboard";
 import { _t } from "../../../languageHandler";
 import SeekBar from "./SeekBar";
 import PlaybackClock from "./PlaybackClock";
-
-interface IProps {
-    // Playback instance to render. Cannot change during component lifecycle: create
-    // an all-new component instead.
-    playback: Playback;
-
-    mediaName: string;
-}
-
-interface IState {
-    playbackPhase: PlaybackState;
-}
+import AudioPlayerBase from "./AudioPlayerBase";
 
 @replaceableComponent("views.audio_messages.AudioPlayer")
-export default class AudioPlayer extends React.PureComponent<IProps, IState> {
+export default class AudioPlayer extends AudioPlayerBase {
     private playPauseRef: RefObject<PlayPauseButton> = createRef();
     private seekRef: RefObject<SeekBar> = createRef();
 
-    constructor(props: IProps) {
-        super(props);
-
-        this.state = {
-            playbackPhase: PlaybackState.Decoding, // default assumption
-        };
-
-        // We don't need to de-register: the class handles this for us internally
-        this.props.playback.on(UPDATE_EVENT, this.onPlaybackUpdate);
-
-        // Don't wait for the promise to complete - it will emit a progress update when it
-        // is done, and it's not meant to take long anyhow.
-        // noinspection JSIgnoredPromiseFromCall
-        this.props.playback.prepare();
-    }
-
-    private onPlaybackUpdate = (ev: PlaybackState) => {
-        this.setState({ playbackPhase: ev });
-    };
-
     private onKeyDown = (ev: React.KeyboardEvent) => {
         // stopPropagation() prevents the FocusComposer catch-all from triggering,
         // but we need to do it on key down instead of press (even though the user
@@ -88,37 +55,39 @@ export default class AudioPlayer extends React.PureComponent<IProps, IState> {
         return `(${formatBytes(bytes)})`;
     }
 
-    public render(): ReactNode {
+    protected renderComponent(): ReactNode {
         // tabIndex=0 to ensure that the whole component becomes a tab stop, where we handle keyboard
         // events for accessibility
-        return <div className='mx_MediaBody mx_AudioPlayer_container' tabIndex={0} onKeyDown={this.onKeyDown}>
-            <div className='mx_AudioPlayer_primaryContainer'>
-                <PlayPauseButton
-                    playback={this.props.playback}
-                    playbackPhase={this.state.playbackPhase}
-                    tabIndex={-1} // prevent tabbing into the button
-                    ref={this.playPauseRef}
-                />
-                <div className='mx_AudioPlayer_mediaInfo'>
-                    <span className='mx_AudioPlayer_mediaName'>
-                        {this.props.mediaName || _t("Unnamed audio")}
-                    </span>
-                    <div className='mx_AudioPlayer_byline'>
-                        <DurationClock playback={this.props.playback} />
-                        &nbsp; {/* easiest way to introduce a gap between the components */}
-                        { this.renderFileSize() }
+        return (
+            <div className='mx_MediaBody mx_AudioPlayer_container' tabIndex={0} onKeyDown={this.onKeyDown}>
+                <div className='mx_AudioPlayer_primaryContainer'>
+                    <PlayPauseButton
+                        playback={this.props.playback}
+                        playbackPhase={this.state.playbackPhase}
+                        tabIndex={-1} // prevent tabbing into the button
+                        ref={this.playPauseRef}
+                    />
+                    <div className='mx_AudioPlayer_mediaInfo'>
+                        <span className='mx_AudioPlayer_mediaName'>
+                            { this.props.mediaName || _t("Unnamed audio") }
+                        </span>
+                        <div className='mx_AudioPlayer_byline'>
+                            <DurationClock playback={this.props.playback} />
+                            &nbsp; { /* easiest way to introduce a gap between the components */ }
+                            { this.renderFileSize() }
+                        </div>
                     </div>
                 </div>
+                <div className='mx_AudioPlayer_seek'>
+                    <SeekBar
+                        playback={this.props.playback}
+                        tabIndex={-1} // prevent tabbing into the bar
+                        playbackPhase={this.state.playbackPhase}
+                        ref={this.seekRef}
+                    />
+                    <PlaybackClock playback={this.props.playback} defaultDisplaySeconds={0} />
+                </div>
             </div>
-            <div className='mx_AudioPlayer_seek'>
-                <SeekBar
-                    playback={this.props.playback}
-                    tabIndex={-1} // prevent tabbing into the bar
-                    playbackPhase={this.state.playbackPhase}
-                    ref={this.seekRef}
-                />
-                <PlaybackClock playback={this.props.playback} defaultDisplaySeconds={0} />
-            </div>
-        </div>;
+        );
     }
 }

src/components/views/audio_messages/AudioPlayerBase.tsx

@@ -0,0 +1,70 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { Playback, PlaybackState } from "../../../audio/Playback";
+import { TileShape } from "../rooms/EventTile";
+import React, { ReactNode } from "react";
+import { UPDATE_EVENT } from "../../../stores/AsyncStore";
+import { replaceableComponent } from "../../../utils/replaceableComponent";
+import { _t } from "../../../languageHandler";
+
+interface IProps {
+    // Playback instance to render. Cannot change during component lifecycle: create
+    // an all-new component instead.
+    playback: Playback;
+
+    mediaName?: string;
+    tileShape?: TileShape;
+}
+
+interface IState {
+    playbackPhase: PlaybackState;
+    error?: boolean;
+}
+
+@replaceableComponent("views.audio_messages.AudioPlayerBase")
+export default abstract class AudioPlayerBase extends React.PureComponent<IProps, IState> {
+    constructor(props: IProps) {
+        super(props);
+
+        this.state = {
+            playbackPhase: PlaybackState.Decoding, // default assumption
+        };
+
+        // We don't need to de-register: the class handles this for us internally
+        this.props.playback.on(UPDATE_EVENT, this.onPlaybackUpdate);
+
+        // Don't wait for the promise to complete - it will emit a progress update when it
+        // is done, and it's not meant to take long anyhow.
+        this.props.playback.prepare().catch(e => {
+            console.error("Error processing audio file:", e);
+            this.setState({ error: true });
+        });
+    }
+
+    private onPlaybackUpdate = (ev: PlaybackState) => {
+        this.setState({ playbackPhase: ev });
+    };
+
+    protected abstract renderComponent(): ReactNode;
+
+    public render(): ReactNode {
+        return <>
+            { this.renderComponent() }
+            { this.state.error && <div className="text-warning">{ _t("Error downloading audio") }</div> }
+        </>;
+    }
+}

src/components/views/audio_messages/Clock.tsx

@@ -43,6 +43,6 @@ export default class Clock extends React.Component<IProps, IState> {
     public render() {
         const minutes = Math.floor(this.props.seconds / 60).toFixed(0).padStart(2, '0');
         const seconds = Math.floor(this.props.seconds % 60).toFixed(0).padStart(2, '0'); // hide millis
-        return <span className='mx_Clock'>{minutes}:{seconds}</span>;
+        return <span className='mx_Clock'>{ minutes }:{ seconds }</span>;
     }
 }

src/components/views/audio_messages/DurationClock.tsx

@@ -17,7 +17,7 @@ limitations under the License.
 import React from "react";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 import Clock from "./Clock";
-import { Playback } from "../../../voice/Playback";
+import { Playback } from "../../../audio/Playback";
 
 interface IProps {
     playback: Playback;

src/components/views/audio_messages/LiveRecordingClock.tsx

@@ -15,7 +15,7 @@ limitations under the License.
 */
 
 import React from "react";
-import { IRecordingUpdate, VoiceRecording } from "../../../voice/VoiceRecording";
+import { IRecordingUpdate, VoiceRecording } from "../../../audio/VoiceRecording";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 import Clock from "./Clock";
 import { MarkedExecution } from "../../../utils/MarkedExecution";

src/components/views/audio_messages/LiveRecordingWaveform.tsx

@@ -15,10 +15,9 @@ limitations under the License.
 */
 
 import React from "react";
-import { IRecordingUpdate, RECORDING_PLAYBACK_SAMPLES, VoiceRecording } from "../../../voice/VoiceRecording";
+import { IRecordingUpdate, RECORDING_PLAYBACK_SAMPLES, VoiceRecording } from "../../../audio/VoiceRecording";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
-import { arrayFastResample } from "../../../utils/arrays";
-import { percentageOf } from "../../../utils/numbers";
+import { arrayFastResample, arraySeed } from "../../../utils/arrays";
 import Waveform from "./Waveform";
 import { MarkedExecution } from "../../../utils/MarkedExecution";
 
@@ -48,18 +47,14 @@ export default class LiveRecordingWaveform extends React.PureComponent<IProps, I
     constructor(props) {
         super(props);
         this.state = {
-            waveform: [],
+            waveform: arraySeed(0, RECORDING_PLAYBACK_SAMPLES),
         };
     }
 
     componentDidMount() {
         this.props.recorder.liveData.onUpdate((update: IRecordingUpdate) => {
-            const bars = arrayFastResample(Array.from(update.waveform), RECORDING_PLAYBACK_SAMPLES);
-            // The incoming data is between zero and one, but typically even screaming into a
-            // microphone won't send you over 0.6, so we artificially adjust the gain for the
-            // waveform. This results in a slightly more cinematic/animated waveform for the
-            // user.
-            this.waveform = bars.map(b => percentageOf(b, 0, 0.50));
+            // The incoming data is between zero and one, so we don't need to clamp/rescale it.
+            this.waveform = arrayFastResample(Array.from(update.waveform), RECORDING_PLAYBACK_SAMPLES);
             this.scheduledUpdate.mark();
         });
     }

src/components/views/audio_messages/PlayPauseButton.tsx

@@ -18,7 +18,7 @@ import React, { ReactNode } from "react";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 import AccessibleTooltipButton from "../elements/AccessibleTooltipButton";
 import { _t } from "../../../languageHandler";
-import { Playback, PlaybackState } from "../../../voice/Playback";
+import { Playback, PlaybackState } from "../../../audio/Playback";
 import classNames from "classnames";
 
 // omitted props are handled by render function

src/components/views/audio_messages/PlaybackClock.tsx

@@ -17,7 +17,7 @@ limitations under the License.
 import React from "react";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 import Clock from "./Clock";
-import { Playback, PlaybackState } from "../../../voice/Playback";
+import { Playback, PlaybackState } from "../../../audio/Playback";
 import { UPDATE_EVENT } from "../../../stores/AsyncStore";
 
 interface IProps {

src/components/views/audio_messages/PlaybackWaveform.tsx

@@ -18,7 +18,7 @@ import React from "react";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 import { arraySeed, arrayTrimFill } from "../../../utils/arrays";
 import Waveform from "./Waveform";
-import { Playback, PLAYBACK_WAVEFORM_SAMPLES } from "../../../voice/Playback";
+import { Playback, PLAYBACK_WAVEFORM_SAMPLES } from "../../../audio/Playback";
 import { percentageOf } from "../../../utils/numbers";
 
 interface IProps {

src/components/views/audio_messages/RecordingPlayback.tsx

@@ -14,61 +14,30 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import { Playback, PlaybackState } from "../../../voice/Playback";
 import React, { ReactNode } from "react";
-import { UPDATE_EVENT } from "../../../stores/AsyncStore";
 import PlayPauseButton from "./PlayPauseButton";
 import PlaybackClock from "./PlaybackClock";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 import { TileShape } from "../rooms/EventTile";
 import PlaybackWaveform from "./PlaybackWaveform";
-
-interface IProps {
-    // Playback instance to render. Cannot change during component lifecycle: create
-    // an all-new component instead.
-    playback: Playback;
-
-    tileShape?: TileShape;
-}
-
-interface IState {
-    playbackPhase: PlaybackState;
-}
+import AudioPlayerBase from "./AudioPlayerBase";
 
 @replaceableComponent("views.audio_messages.RecordingPlayback")
-export default class RecordingPlayback extends React.PureComponent<IProps, IState> {
-    constructor(props: IProps) {
-        super(props);
-
-        this.state = {
-            playbackPhase: PlaybackState.Decoding, // default assumption
-        };
-
-        // We don't need to de-register: the class handles this for us internally
-        this.props.playback.on(UPDATE_EVENT, this.onPlaybackUpdate);
-
-        // Don't wait for the promise to complete - it will emit a progress update when it
-        // is done, and it's not meant to take long anyhow.
-        // noinspection JSIgnoredPromiseFromCall
-        this.props.playback.prepare();
-    }
-
+export default class RecordingPlayback extends AudioPlayerBase {
     private get isWaveformable(): boolean {
         return this.props.tileShape !== TileShape.Notif
             && this.props.tileShape !== TileShape.FileGrid
             && this.props.tileShape !== TileShape.Pinned;
     }
 
-    private onPlaybackUpdate = (ev: PlaybackState) => {
-        this.setState({ playbackPhase: ev });
-    };
-
-    public render(): ReactNode {
+    protected renderComponent(): ReactNode {
         const shapeClass = !this.isWaveformable ? 'mx_VoiceMessagePrimaryContainer_noWaveform' : '';
-        return <div className={'mx_MediaBody mx_VoiceMessagePrimaryContainer ' + shapeClass}>
-            <PlayPauseButton playback={this.props.playback} playbackPhase={this.state.playbackPhase} />
-            <PlaybackClock playback={this.props.playback} />
-            { this.isWaveformable && <PlaybackWaveform playback={this.props.playback} /> }
-        </div>;
+        return (
+            <div className={'mx_MediaBody mx_VoiceMessagePrimaryContainer ' + shapeClass}>
+                <PlayPauseButton playback={this.props.playback} playbackPhase={this.state.playbackPhase} />
+                <PlaybackClock playback={this.props.playback} />
+                { this.isWaveformable && <PlaybackWaveform playback={this.props.playback} /> }
+            </div>
+        );
     }
 }

src/components/views/audio_messages/SeekBar.tsx

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import { Playback, PlaybackState } from "../../../voice/Playback";
+import { Playback, PlaybackState } from "../../../audio/Playback";
 import React, { ChangeEvent, CSSProperties, ReactNode } from "react";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 import { MarkedExecution } from "../../../utils/MarkedExecution";

src/components/views/audio_messages/Waveform.tsx

@@ -47,17 +47,21 @@ export default class Waveform extends React.PureComponent<IProps, IState> {
 
     public render() {
         return <div className='mx_Waveform'>
-            {this.props.relHeights.map((h, i) => {
+            { this.props.relHeights.map((h, i) => {
                 const progress = this.props.progress;
                 const isCompleteBar = (i / this.props.relHeights.length) <= progress && progress > 0;
                 const classes = classNames({
                     'mx_Waveform_bar': true,
                     'mx_Waveform_bar_100pct': isCompleteBar,
                 });
-                return <span key={i} style={{
-                    "--barHeight": h,
-                } as WaveformCSSProperties} className={classes} />;
-            })}
+                return <span
+                    key={i}
+                    style={{
+                        "--barHeight": h,
+                    } as WaveformCSSProperties}
+                    className={classes}
+                />;
+            }) }
         </div>;
     }
 }

src/components/views/auth/AuthBody.tsx

@@ -19,7 +19,7 @@ import { replaceableComponent } from "../../../utils/replaceableComponent";
 
 @replaceableComponent("views.auth.AuthBody")
 export default class AuthBody extends React.PureComponent {
-    render() {
+    public render(): React.ReactNode {
         return <div className="mx_AuthBody">
             { this.props.children }
         </div>;

src/components/views/auth/AuthFooter.tsx

@@ -22,7 +22,7 @@ import { replaceableComponent } from "../../../utils/replaceableComponent";
 
 @replaceableComponent("views.auth.AuthFooter")
 export default class AuthFooter extends React.Component {
-    render() {
+    public render(): React.ReactNode {
         return (
             <div className="mx_AuthFooter">
                 <a href="https://matrix.org" target="_blank" rel="noreferrer noopener">{ _t("powered by Matrix") }</a>

src/components/views/auth/AuthHeader.tsx

@@ -16,20 +16,17 @@ limitations under the License.
 */
 
 import React from 'react';
-import PropTypes from 'prop-types';
-import * as sdk from '../../../index';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import AuthHeaderLogo from "./AuthHeaderLogo";
+import LanguageSelector from "./LanguageSelector";
+
+interface IProps {
+    disableLanguageSelector?: boolean;
+}
 
 @replaceableComponent("views.auth.AuthHeader")
-export default class AuthHeader extends React.Component {
-    static propTypes = {
-        disableLanguageSelector: PropTypes.bool,
-    };
-
-    render() {
-        const AuthHeaderLogo = sdk.getComponent('auth.AuthHeaderLogo');
-        const LanguageSelector = sdk.getComponent('views.auth.LanguageSelector');
-
+export default class AuthHeader extends React.Component<IProps> {
+    public render(): React.ReactNode {
         return (
             <div className="mx_AuthHeader">
                 <AuthHeaderLogo />

src/components/views/auth/AuthHeaderLogo.tsx

@@ -19,7 +19,7 @@ import { replaceableComponent } from "../../../utils/replaceableComponent";
 
 @replaceableComponent("views.auth.AuthHeaderLogo")
 export default class AuthHeaderLogo extends React.PureComponent {
-    render() {
+    public render(): React.ReactNode {
         return <div className="mx_AuthHeaderLogo">
             Matrix
         </div>;

src/components/views/auth/AuthPage.tsx

@@ -17,18 +17,16 @@ limitations under the License.
 */
 
 import React from 'react';
-import * as sdk from '../../../index';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import AuthFooter from "./AuthFooter";
 
 @replaceableComponent("views.auth.AuthPage")
 export default class AuthPage extends React.PureComponent {
-    render() {
-        const AuthFooter = sdk.getComponent('auth.AuthFooter');
-
+    public render(): React.ReactNode {
         return (
             <div className="mx_AuthPage">
                 <div className="mx_AuthPage_modal">
-                    {this.props.children}
+                    { this.props.children }
                 </div>
                 <AuthFooter />
             </div>

src/components/views/auth/CaptchaForm.tsx

@@ -15,66 +15,74 @@ limitations under the License.
 */
 
 import React, { createRef } from 'react';
-import PropTypes from 'prop-types';
 import { _t } from '../../../languageHandler';
 import CountlyAnalytics from "../../../CountlyAnalytics";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 
 const DIV_ID = 'mx_recaptcha';
 
+interface ICaptchaFormProps {
+    sitePublicKey: string;
+    onCaptchaResponse: (response: string) => void;
+}
+
+interface ICaptchaFormState {
+    errorText?: string;
+
+}
+
 /**
  * A pure UI component which displays a captcha form.
  */
 @replaceableComponent("views.auth.CaptchaForm")
-export default class CaptchaForm extends React.Component {
-    static propTypes = {
-        sitePublicKey: PropTypes.string,
-
-        // called with the captcha response
-        onCaptchaResponse: PropTypes.func,
-    };
-
+export default class CaptchaForm extends React.Component<ICaptchaFormProps, ICaptchaFormState> {
     static defaultProps = {
         onCaptchaResponse: () => {},
     };
 
-    constructor(props) {
+    private captchaWidgetId?: string;
+    private recaptchaContainer = createRef<HTMLDivElement>();
+
+    constructor(props: ICaptchaFormProps) {
         super(props);
 
         this.state = {
-            errorText: null,
+            errorText: undefined,
         };
 
-        this._captchaWidgetId = null;
-
-        this._recaptchaContainer = createRef();
-
         CountlyAnalytics.instance.track("onboarding_grecaptcha_begin");
     }
 
     componentDidMount() {
         // Just putting a script tag into the returned jsx doesn't work, annoyingly,
         // so we do this instead.
-        if (global.grecaptcha) {
+        if (this.isRecaptchaReady()) {
             // already loaded
-            this._onCaptchaLoaded();
+            this.onCaptchaLoaded();
         } else {
             console.log("Loading recaptcha script...");
-            window.mx_on_recaptcha_loaded = () => {this._onCaptchaLoaded();};
+            window.mxOnRecaptchaLoaded = () => { this.onCaptchaLoaded(); };
             const scriptTag = document.createElement('script');
             scriptTag.setAttribute(
-                'src', `https://www.recaptcha.net/recaptcha/api.js?onload=mx_on_recaptcha_loaded&render=explicit`,
+                'src', `https://www.recaptcha.net/recaptcha/api.js?onload=mxOnRecaptchaLoaded&render=explicit`,
             );
-            this._recaptchaContainer.current.appendChild(scriptTag);
+            this.recaptchaContainer.current.appendChild(scriptTag);
         }
     }
 
     componentWillUnmount() {
-        this._resetRecaptcha();
+        this.resetRecaptcha();
     }
 
-    _renderRecaptcha(divId) {
-        if (!global.grecaptcha) {
+    // Borrowed directly from: https://github.com/codeep/react-recaptcha-google/commit/e118fa5670fa268426969323b2e7fe77698376ba
+    private isRecaptchaReady(): boolean {
+        return typeof window !== "undefined" &&
+            typeof global.grecaptcha !== "undefined" &&
+            typeof global.grecaptcha.render === 'function';
+    }
+
+    private renderRecaptcha(divId: string) {
+        if (!this.isRecaptchaReady()) {
             console.error("grecaptcha not loaded!");
             throw new Error("Recaptcha did not load successfully");
         }
@@ -84,26 +92,26 @@ export default class CaptchaForm extends React.Component {
             console.error("No public key for recaptcha!");
             throw new Error(
                 "This server has not supplied enough information for Recaptcha "
-                    + "authentication");
+                + "authentication");
         }
 
         console.info("Rendering to %s", divId);
-        this._captchaWidgetId = global.grecaptcha.render(divId, {
+        this.captchaWidgetId = global.grecaptcha.render(divId, {
             sitekey: publicKey,
             callback: this.props.onCaptchaResponse,
         });
     }
 
-    _resetRecaptcha() {
-        if (this._captchaWidgetId !== null) {
-            global.grecaptcha.reset(this._captchaWidgetId);
+    private resetRecaptcha() {
+        if (this.captchaWidgetId) {
+            global?.grecaptcha?.reset(this.captchaWidgetId);
         }
     }
 
-    _onCaptchaLoaded() {
+    private onCaptchaLoaded() {
         console.log("Loaded recaptcha script.");
         try {
-            this._renderRecaptcha(DIV_ID);
+            this.renderRecaptcha(DIV_ID);
             // clear error if re-rendered
             this.setState({
                 errorText: null,
@@ -128,10 +136,10 @@ export default class CaptchaForm extends React.Component {
         }
 
         return (
-            <div ref={this._recaptchaContainer}>
-                <p>{_t(
+            <div ref={this.recaptchaContainer}>
+                <p>{ _t(
                     "This homeserver would like to make sure you are not a robot.",
-                )}</p>
+                ) }</p>
                 <div id={DIV_ID} />
                 { error }
             </div>

src/components/views/auth/CompleteSecurityBody.tsx

@@ -19,7 +19,7 @@ import { replaceableComponent } from "../../../utils/replaceableComponent";
 
 @replaceableComponent("views.auth.CompleteSecurityBody")
 export default class CompleteSecurityBody extends React.PureComponent {
-    render() {
+    public render(): React.ReactNode {
         return <div className="mx_CompleteSecurityBody">
             { this.props.children }
         </div>;

src/components/views/auth/CountryDropdown.tsx

@@ -15,21 +15,19 @@ limitations under the License.
 */
 
 import React from 'react';
-import PropTypes from 'prop-types';
 
-import * as sdk from '../../../index';
-
-import { COUNTRIES, getEmojiFlag } from '../../../phonenumber';
+import { COUNTRIES, getEmojiFlag, PhoneNumberCountryDefinition } from '../../../phonenumber';
 import SdkConfig from "../../../SdkConfig";
 import { _t } from "../../../languageHandler";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import Dropdown from "../elements/Dropdown";
 
 const COUNTRIES_BY_ISO2 = {};
 for (const c of COUNTRIES) {
     COUNTRIES_BY_ISO2[c.iso2] = c;
 }
 
-function countryMatchesSearchQuery(query, country) {
+function countryMatchesSearchQuery(query: string, country: PhoneNumberCountryDefinition): boolean {
     // Remove '+' if present (when searching for a prefix)
     if (query[0] === '+') {
         query = query.slice(1);
@@ -41,15 +39,26 @@ function countryMatchesSearchQuery(query, country) {
     return false;
 }
 
-@replaceableComponent("views.auth.CountryDropdown")
-export default class CountryDropdown extends React.Component {
-    constructor(props) {
-        super(props);
-        this._onSearchChange = this._onSearchChange.bind(this);
-        this._onOptionChange = this._onOptionChange.bind(this);
-        this._getShortOption = this._getShortOption.bind(this);
+interface IProps {
+    value?: string;
+    onOptionChange: (country: PhoneNumberCountryDefinition) => void;
+    isSmall: boolean; // if isSmall, show +44 in the selected value
+    showPrefix: boolean;
+    className?: string;
+    disabled?: boolean;
+}
 
-        let defaultCountry = COUNTRIES[0];
+interface IState {
+    searchQuery: string;
+    defaultCountry: PhoneNumberCountryDefinition;
+}
+
+@replaceableComponent("views.auth.CountryDropdown")
+export default class CountryDropdown extends React.Component<IProps, IState> {
+    constructor(props: IProps) {
+        super(props);
+
+        let defaultCountry: PhoneNumberCountryDefinition = COUNTRIES[0];
         const defaultCountryCode = SdkConfig.get()["defaultCountryCode"];
         if (defaultCountryCode) {
             const country = COUNTRIES.find(c => c.iso2 === defaultCountryCode.toUpperCase());
@@ -62,7 +71,7 @@ export default class CountryDropdown extends React.Component {
         };
     }
 
-    componentDidMount() {
+    public componentDidMount(): void {
         if (!this.props.value) {
             // If no value is given, we start with the default
             // country selected, but our parent component
@@ -71,21 +80,21 @@ export default class CountryDropdown extends React.Component {
         }
     }
 
-    _onSearchChange(search) {
+    private onSearchChange = (search: string): void => {
         this.setState({
             searchQuery: search,
         });
-    }
+    };
 
-    _onOptionChange(iso2) {
+    private onOptionChange = (iso2: string): void => {
         this.props.onOptionChange(COUNTRIES_BY_ISO2[iso2]);
-    }
+    };
 
-    _flagImgForIso2(iso2) {
+    private flagImgForIso2(iso2: string): React.ReactNode {
         return <div className="mx_Dropdown_option_emoji">{ getEmojiFlag(iso2) }</div>;
     }
 
-    _getShortOption(iso2) {
+    private getShortOption = (iso2: string): React.ReactNode => {
         if (!this.props.isSmall) {
             return undefined;
         }
@@ -94,14 +103,12 @@ export default class CountryDropdown extends React.Component {
             countryPrefix = '+' + COUNTRIES_BY_ISO2[iso2].prefix;
         }
         return <span className="mx_CountryDropdown_shortOption">
-            { this._flagImgForIso2(iso2) }
+            { this.flagImgForIso2(iso2) }
             { countryPrefix }
         </span>;
-    }
-
-    render() {
-        const Dropdown = sdk.getComponent('elements.Dropdown');
+    };
 
+    public render(): React.ReactNode {
         let displayedCountries;
         if (this.state.searchQuery) {
             displayedCountries = COUNTRIES.filter(
@@ -124,7 +131,7 @@ export default class CountryDropdown extends React.Component {
 
         const options = displayedCountries.map((country) => {
             return <div className="mx_CountryDropdown_option" key={country.iso2}>
-                { this._flagImgForIso2(country.iso2) }
+                { this.flagImgForIso2(country.iso2) }
                 { _t(country.name) } (+{ country.prefix })
             </div>;
         });
@@ -136,10 +143,10 @@ export default class CountryDropdown extends React.Component {
         return <Dropdown
             id="mx_CountryDropdown"
             className={this.props.className + " mx_CountryDropdown"}
-            onOptionChange={this._onOptionChange}
-            onSearchChange={this._onSearchChange}
+            onOptionChange={this.onOptionChange}
+            onSearchChange={this.onSearchChange}
             menuWidth={298}
-            getShortOption={this._getShortOption}
+            getShortOption={this.getShortOption}
             value={value}
             searchEnabled={true}
             disabled={this.props.disabled}
@@ -149,13 +156,3 @@ export default class CountryDropdown extends React.Component {
         </Dropdown>;
     }
 }
-
-CountryDropdown.propTypes = {
-    className: PropTypes.string,
-    isSmall: PropTypes.bool,
-    // if isSmall, show +44 in the selected value
-    showPrefix: PropTypes.bool,
-    onOptionChange: PropTypes.func.isRequired,
-    value: PropTypes.string,
-    disabled: PropTypes.bool,
-};

src/components/views/auth/InteractiveAuthEntryComponents.tsx

@@ -416,13 +416,15 @@ export class TermsAuthEntry extends React.Component<ITermsAuthEntryProps, ITerms
         let submitButton;
         if (this.props.showContinue !== false) {
             // XXX: button classes
-            submitButton = <button className="mx_InteractiveAuthEntryComponents_termsSubmit mx_GeneralButton"
-                onClick={this.trySubmit} disabled={!allChecked}>{_t("Accept")}</button>;
+            submitButton = <button
+                className="mx_InteractiveAuthEntryComponents_termsSubmit mx_GeneralButton"
+                onClick={this.trySubmit}
+                disabled={!allChecked}>{ _t("Accept") }</button>;
         }
 
         return (
             <div>
-                <p>{_t("Please review and accept the policies of this homeserver:")}</p>
+                <p>{ _t("Please review and accept the policies of this homeserver:") }</p>
                 { checkboxes }
                 { errorSection }
                 { submitButton }
@@ -613,15 +615,17 @@ export class MsisdnAuthEntry extends React.Component<IMsisdnAuthEntryProps, IMsi
                                 className="mx_InteractiveAuthEntryComponents_msisdnEntry"
                                 value={this.state.token}
                                 onChange={this.onTokenChange}
-                                aria-label={ _t("Code")}
+                                aria-label={_t("Code")}
                             />
                             <br />
-                            <input type="submit" value={_t("Submit")}
+                            <input
+                                type="submit"
+                                value={_t("Submit")}
                                 className={submitClasses}
                                 disabled={!enableSubmit}
                             />
                         </form>
-                        {errorSection}
+                        { errorSection }
                     </div>
                 </div>
             );
@@ -717,21 +721,21 @@ export class SSOAuthEntry extends React.Component<ISSOAuthEntryProps, ISSOAuthEn
             <AccessibleButton
                 onClick={this.props.onCancel}
                 kind={this.props.continueKind ? (this.props.continueKind + '_outline') : 'primary_outline'}
-            >{_t("Cancel")}</AccessibleButton>
+            >{ _t("Cancel") }</AccessibleButton>
         );
         if (this.state.phase === SSOAuthEntry.PHASE_PREAUTH) {
             continueButton = (
                 <AccessibleButton
                     onClick={this.onStartAuthClick}
                     kind={this.props.continueKind || 'primary'}
-                >{this.props.continueText || _t("Single Sign On")}</AccessibleButton>
+                >{ this.props.continueText || _t("Single Sign On") }</AccessibleButton>
             );
         } else {
             continueButton = (
                 <AccessibleButton
                     onClick={this.onConfirmClick}
                     kind={this.props.continueKind || 'primary'}
-                >{this.props.continueText || _t("Confirm")}</AccessibleButton>
+                >{ this.props.continueText || _t("Confirm") }</AccessibleButton>
             );
         }
 
@@ -753,8 +757,8 @@ export class SSOAuthEntry extends React.Component<ISSOAuthEntryProps, ISSOAuthEn
         return <React.Fragment>
             { errorSection }
             <div className="mx_InteractiveAuthEntryComponents_sso_buttons">
-                {cancelButton}
-                {continueButton}
+                { cancelButton }
+                { continueButton }
             </div>
         </React.Fragment>;
     }
@@ -825,7 +829,7 @@ export class FallbackAuthEntry extends React.Component<IAuthEntryProps> {
                 <a href="" ref={this.fallbackButton} onClick={this.onShowFallbackClick}>{
                     _t("Start authentication")
                 }</a>
-                {errorSection}
+                { errorSection }
             </div>
         );
     }

src/components/views/auth/LanguageSelector.tsx

@@ -18,21 +18,23 @@ import SdkConfig from "../../../SdkConfig";
 import { getCurrentLanguage } from "../../../languageHandler";
 import SettingsStore from "../../../settings/SettingsStore";
 import PlatformPeg from "../../../PlatformPeg";
-import * as sdk from '../../../index';
 import React from 'react';
 import { SettingLevel } from "../../../settings/SettingLevel";
+import LanguageDropdown from "../elements/LanguageDropdown";
 
-function onChange(newLang) {
+function onChange(newLang: string): void {
     if (getCurrentLanguage() !== newLang) {
         SettingsStore.setValue("language", null, SettingLevel.DEVICE, newLang);
         PlatformPeg.get().reload();
     }
 }
 
-export default function LanguageSelector({ disabled }) {
-    if (SdkConfig.get()['disable_login_language_selector']) return <div />;
+interface IProps {
+    disabled?: boolean;
+}
 
-    const LanguageDropdown = sdk.getComponent('views.elements.LanguageDropdown');
+export default function LanguageSelector({ disabled }: IProps): JSX.Element {
+    if (SdkConfig.get()['disable_login_language_selector']) return <div />;
     return <LanguageDropdown
         className="mx_AuthBody_language"
         onOptionChange={onChange}

src/components/views/auth/PasswordLogin.tsx

@@ -416,7 +416,7 @@ export default class PasswordLogin extends React.PureComponent<IProps, IState> {
                 kind="link"
                 onClick={this.onForgotPasswordClick}
             >
-                {_t("Forgot password?")}
+                { _t("Forgot password?") }
             </AccessibleButton>;
         }
 
@@ -441,16 +441,16 @@ export default class PasswordLogin extends React.PureComponent<IProps, IState> {
                         disabled={this.props.disableSubmit}
                     >
                         <option key={LoginField.MatrixId} value={LoginField.MatrixId}>
-                            {_t('Username')}
+                            { _t('Username') }
                         </option>
                         <option
                             key={LoginField.Email}
                             value={LoginField.Email}
                         >
-                            {_t('Email address')}
+                            { _t('Email address') }
                         </option>
                         <option key={LoginField.Password} value={LoginField.Password}>
-                            {_t('Phone')}
+                            { _t('Phone') }
                         </option>
                     </Field>
                 </div>
@@ -460,8 +460,8 @@ export default class PasswordLogin extends React.PureComponent<IProps, IState> {
         return (
             <div>
                 <form onSubmit={this.onSubmitForm}>
-                    {loginType}
-                    {loginField}
+                    { loginType }
+                    { loginField }
                     <Field
                         className={pwFieldClass}
                         type="password"
@@ -474,7 +474,7 @@ export default class PasswordLogin extends React.PureComponent<IProps, IState> {
                         onValidate={this.onPasswordValidate}
                         ref={field => this[LoginField.Password] = field}
                     />
-                    {forgotPasswordJsx}
+                    { forgotPasswordJsx }
                     { !this.props.busy && <input className="mx_Login_submit"
                         type="submit"
                         value={_t('Sign in')}

src/components/views/auth/RegistrationForm.tsx

@@ -537,15 +537,15 @@ export default class RegistrationForm extends React.PureComponent<IProps, IState
             <div>
                 <form onSubmit={this.onSubmit}>
                     <div className="mx_AuthBody_fieldRow">
-                        {this.renderUsername()}
+                        { this.renderUsername() }
                     </div>
                     <div className="mx_AuthBody_fieldRow">
-                        {this.renderPassword()}
-                        {this.renderPasswordConfirm()}
+                        { this.renderPassword() }
+                        { this.renderPasswordConfirm() }
                     </div>
                     <div className="mx_AuthBody_fieldRow">
-                        {this.renderEmail()}
-                        {this.renderPhoneNumber()}
+                        { this.renderEmail() }
+                        { this.renderPhoneNumber() }
                     </div>
                     { emailHelperText }
                     { registerButton }

src/components/views/auth/Welcome.tsx

@@ -17,7 +17,7 @@ limitations under the License.
 import React from 'react';
 import classNames from "classnames";
 
-import * as sdk from '../../../index';
+import * as sdk from "../../../index";
 import SdkConfig from '../../../SdkConfig';
 import AuthPage from "./AuthPage";
 import { _td } from "../../../languageHandler";
@@ -25,21 +25,26 @@ import SettingsStore from "../../../settings/SettingsStore";
 import { UIFeature } from "../../../settings/UIFeature";
 import CountlyAnalytics from "../../../CountlyAnalytics";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import LanguageSelector from "./LanguageSelector";
 
 // translatable strings for Welcome pages
 _td("Sign in with SSO");
 
+interface IProps {
+
+}
+
 @replaceableComponent("views.auth.Welcome")
-export default class Welcome extends React.PureComponent {
-    constructor(props) {
+export default class Welcome extends React.PureComponent<IProps> {
+    constructor(props: IProps) {
         super(props);
 
         CountlyAnalytics.instance.track("onboarding_welcome");
     }
 
-    render() {
-        const EmbeddedPage = sdk.getComponent('structures.EmbeddedPage');
-        const LanguageSelector = sdk.getComponent('auth.LanguageSelector');
+    public render(): React.ReactNode {
+        // FIXME: Using an import will result in wrench-element-tests failures
+        const EmbeddedPage = sdk.getComponent("structures.EmbeddedPage");
 
         const pagesConfig = SdkConfig.get().embeddedPages;
         let pageUrl = null;

src/components/views/avatars/BaseAvatar.tsx

@@ -187,7 +187,8 @@ const BaseAvatar = (props: IProps) => {
                     width: toPx(width),
                     height: toPx(height),
                 }}
-                title={title} alt={_t("Avatar")}
+                title={title}
+                alt={_t("Avatar")}
                 inputRef={inputRef}
                 {...otherProps} />
         );
@@ -201,7 +202,8 @@ const BaseAvatar = (props: IProps) => {
                     width: toPx(width),
                     height: toPx(height),
                 }}
-                title={title} alt=""
+                title={title}
+                alt=""
                 ref={inputRef}
                 {...otherProps} />
         );

src/components/views/avatars/DecoratedRoomAvatar.tsx

@@ -205,8 +205,8 @@ export default class DecoratedRoomAvatar extends React.PureComponent<IProps, ISt
                 oobData={this.props.oobData}
                 viewAvatarOnClick={this.props.viewAvatarOnClick}
             />
-            {icon}
-            {badge}
+            { icon }
+            { badge }
         </div>;
     }
 }

src/components/views/avatars/MemberAvatar.tsx

@@ -102,8 +102,12 @@ export default class MemberAvatar extends React.Component<IProps, IState> {
         }
 
         return (
-            <BaseAvatar {...otherProps} name={this.state.name} title={this.state.title}
-                idName={userId} url={this.state.imageUrl} onClick={onClick} />
+            <BaseAvatar {...otherProps}
+                name={this.state.name}
+                title={this.state.title}
+                idName={userId}
+                url={this.state.imageUrl}
+                onClick={onClick} />
         );
     }
 }

src/components/views/avatars/MemberStatusMessageAvatar.js

@@ -145,7 +145,7 @@ export default class MemberStatusMessageAvatar extends React.Component {
                 isExpanded={this.state.menuDisplayed}
                 label={_t("User Status")}
             >
-                {avatar}
+                { avatar }
             </ContextMenuButton>
 
             { contextMenu }

src/components/views/avatars/RoomAvatar.tsx

@@ -13,15 +13,18 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
+
 import React, { ComponentProps } from 'react';
 import { Room } from 'matrix-js-sdk/src/models/room';
 import { ResizeMethod } from 'matrix-js-sdk/src/@types/partials';
+import classNames from "classnames";
 
 import BaseAvatar from './BaseAvatar';
 import ImageView from '../elements/ImageView';
 import { MatrixClientPeg } from '../../../MatrixClientPeg';
 import Modal from '../../../Modal';
 import * as Avatar from '../../../Avatar';
+import DMRoomMap from "../../../utils/DMRoomMap";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 import { mediaFromMxc } from "../../../customisations/Media";
 import { IOOBData } from '../../../stores/ThreepidInviteStore';
@@ -31,11 +34,14 @@ interface IProps extends Omit<ComponentProps<typeof BaseAvatar>, "name" | "idNam
     // oobData.avatarUrl should be set (else there
     // would be nowhere to get the avatar from)
     room?: Room;
-    oobData?: IOOBData;
+    oobData?: IOOBData & {
+        roomId?: string;
+    };
     width?: number;
     height?: number;
     resizeMethod?: ResizeMethod;
     viewAvatarOnClick?: boolean;
+    className?: string;
     onClick?(): void;
 }
 
@@ -128,14 +134,21 @@ export default class RoomAvatar extends React.Component<IProps, IState> {
     };
 
     public render() {
-        const { room, oobData, viewAvatarOnClick, onClick, ...otherProps } = this.props;
+        const { room, oobData, viewAvatarOnClick, onClick, className, ...otherProps } = this.props;
 
         const roomName = room ? room.name : oobData.name;
+        // If the room is a DM, we use the other user's ID for the color hash
+        // in order to match the room avatar with their avatar
+        const idName = room ? (DMRoomMap.shared().getUserIdForRoomId(room.roomId) ?? room.roomId) : oobData.roomId;
 
         return (
-            <BaseAvatar {...otherProps}
+            <BaseAvatar
+                {...otherProps}
+                className={classNames(className, {
+                    mx_RoomAvatar_isSpaceRoom: room?.isSpaceRoom(),
+                })}
                 name={roomName}
-                idName={room ? room.roomId : null}
+                idName={idName}
                 urls={this.state.urls}
                 onClick={viewAvatarOnClick && this.state.urls[0] ? this.onRoomAvatarClick : onClick}
             />

src/components/views/beta/BetaCard.tsx

@@ -27,6 +27,8 @@ import BetaFeedbackDialog from "../dialogs/BetaFeedbackDialog";
 import SdkConfig from "../../../SdkConfig";
 import SettingsFlag from "../elements/SettingsFlag";
 
+// XXX: Keep this around for re-use in future Betas
+
 interface IProps {
     title?: string;
     featureId: string;
@@ -105,7 +107,7 @@ const BetaCard = ({ title: titleOverride, featureId }: IProps) => {
             </div>
             <img src={image} alt="" />
         </div>
-        { extraSettings && <div className="mx_BetaCard_relatedSettings">
+        { extraSettings && value && <div className="mx_BetaCard_relatedSettings">
             { extraSettings.map(key => (
                 <SettingsFlag key={key} name={key} level={SettingLevel.DEVICE} />
             )) }

src/components/views/context_menus/CallContextMenu.tsx

@@ -65,15 +65,15 @@ export default class CallContextMenu extends React.Component<IProps> {
         let transferItem;
         if (this.props.call.opponentCanBeTransferred()) {
             transferItem = <MenuItem className="mx_CallContextMenu_item" onClick={this.onTransferClick}>
-                {_t("Transfer")}
+                { _t("Transfer") }
             </MenuItem>;
         }
 
         return <ContextMenu {...this.props}>
             <MenuItem className="mx_CallContextMenu_item" onClick={handler}>
-                {holdUnholdCaption}
+                { holdUnholdCaption }
             </MenuItem>
-            {transferItem}
+            { transferItem }
         </ContextMenu>;
     }
 }

src/components/views/context_menus/DialpadContextMenu.tsx

@@ -49,6 +49,13 @@ export default class DialpadContextMenu extends React.Component<IProps, IState>
         this.props.onFinished();
     };
 
+    onKeyDown = (ev) => {
+        // Prevent Backspace and Delete keys from functioning in the entry field
+        if (ev.code === "Backspace" || ev.code === "Delete") {
+            ev.preventDefault();
+        }
+    };
+
     onChange = (ev) => {
         this.setState({ value: ev.target.value });
     };
@@ -60,8 +67,11 @@ export default class DialpadContextMenu extends React.Component<IProps, IState>
                     <AccessibleButton className="mx_DialPadContextMenu_cancel" onClick={this.onCancelClick} />
                 </div>
                 <div className="mx_DialPadContextMenu_header">
-                    <Field className="mx_DialPadContextMenu_dialled"
-                        value={this.state.value} autoFocus={true}
+                    <Field
+                        className="mx_DialPadContextMenu_dialled"
+                        value={this.state.value}
+                        autoFocus={true}
+                        onKeyDown={this.onKeyDown}
                         onChange={this.onChange}
                     />
                 </div>

src/components/views/context_menus/IconizedContextMenu.tsx

@@ -64,8 +64,8 @@ export const IconizedContextMenuRadio: React.FC<IRadioProps> = ({
         label={label}
     >
         <span className={classNames("mx_IconizedContextMenu_icon", iconClassName)} />
-        <span className="mx_IconizedContextMenu_label">{label}</span>
-        {active && <span className="mx_IconizedContextMenu_icon mx_IconizedContextMenu_checked" />}
+        <span className="mx_IconizedContextMenu_label">{ label }</span>
+        { active && <span className="mx_IconizedContextMenu_icon mx_IconizedContextMenu_checked" /> }
     </MenuItemRadio>;
 };
 
@@ -85,15 +85,19 @@ export const IconizedContextMenuCheckbox: React.FC<ICheckboxProps> = ({
         label={label}
     >
         <span className={classNames("mx_IconizedContextMenu_icon", iconClassName)} />
-        <span className="mx_IconizedContextMenu_label">{label}</span>
-        {active && <span className="mx_IconizedContextMenu_icon mx_IconizedContextMenu_checked" />}
+        <span className="mx_IconizedContextMenu_label">{ label }</span>
+        <span className={classNames("mx_IconizedContextMenu_icon", {
+            mx_IconizedContextMenu_checked: active,
+            mx_IconizedContextMenu_unchecked: !active,
+        })} />
     </MenuItemCheckbox>;
 };
 
-export const IconizedContextMenuOption: React.FC<IOptionProps> = ({ label, iconClassName, ...props }) => {
+export const IconizedContextMenuOption: React.FC<IOptionProps> = ({ label, iconClassName, children, ...props }) => {
     return <MenuItem {...props} label={label}>
         { iconClassName && <span className={classNames("mx_IconizedContextMenu_icon", iconClassName)} /> }
-        <span className="mx_IconizedContextMenu_label">{label}</span>
+        <span className="mx_IconizedContextMenu_label">{ label }</span>
+        { children }
     </MenuItem>;
 };
 
@@ -104,7 +108,7 @@ export const IconizedContextMenuOptionList: React.FC<IOptionListProps> = ({ firs
     });
 
     return <div className={classes}>
-        {children}
+        { children }
     </div>;
 };
 

src/components/views/context_menus/MessageContextMenu.tsx

@@ -43,11 +43,15 @@ export function canCancel(eventStatus: EventStatus): boolean {
     return eventStatus === EventStatus.QUEUED || eventStatus === EventStatus.NOT_SENT;
 }
 
-interface IEventTileOps {
+export interface IEventTileOps {
     isWidgetHidden(): boolean;
     unhideWidget(): void;
 }
 
+export interface IOperableEventTile {
+    getEventTileOps(): IEventTileOps;
+}
+
 interface IProps {
     /* the MatrixEvent associated with the context menu */
     mxEvent: MatrixEvent;
@@ -268,7 +272,7 @@ export default class MessageContextMenu extends React.Component<IProps, IState>
                 resendReactionsButton = (
                     <IconizedContextMenuOption
                         iconClassName="mx_MessageContextMenu_iconResend"
-                        label={ _t('Resend %(unsentCount)s reaction(s)', { unsentCount: unsentReactionsCount }) }
+                        label={_t('Resend %(unsentCount)s reaction(s)', { unsentCount: unsentReactionsCount })}
                         onClick={this.onResendReactionsClick}
                     />
                 );
@@ -298,7 +302,7 @@ export default class MessageContextMenu extends React.Component<IProps, IState>
                 pinButton = (
                     <IconizedContextMenuOption
                         iconClassName="mx_MessageContextMenu_iconPin"
-                        label={ this.isPinned() ? _t('Unpin') : _t('Pin') }
+                        label={this.isPinned() ? _t('Unpin') : _t('Pin')}
                         onClick={this.onPinClick}
                     />
                 );
@@ -333,7 +337,7 @@ export default class MessageContextMenu extends React.Component<IProps, IState>
             <IconizedContextMenuOption
                 iconClassName="mx_MessageContextMenu_iconPermalink"
                 onClick={this.onPermalinkClick}
-                label= {_t('Share')}
+                label={_t('Share')}
                 element="a"
                 {
                     // XXX: Typescript signature for AccessibleButton doesn't work properly for non-inputs like `a`
@@ -364,7 +368,7 @@ export default class MessageContextMenu extends React.Component<IProps, IState>
                 <IconizedContextMenuOption
                     iconClassName="mx_MessageContextMenu_iconLink"
                     onClick={this.closeMenu}
-                    label={ _t('Source URL') }
+                    label={_t('Source URL')}
                     element="a"
                     {
                         // XXX: Typescript signature for AccessibleButton doesn't work properly for non-inputs like `a`

src/components/views/context_menus/SpaceContextMenu.tsx

@@ -0,0 +1,216 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React, { useContext } from "react";
+import { Room } from "matrix-js-sdk/src/models/room";
+import { EventType } from "matrix-js-sdk/src/@types/event";
+
+import {
+    IProps as IContextMenuProps,
+} from "../../structures/ContextMenu";
+import IconizedContextMenu, { IconizedContextMenuOption, IconizedContextMenuOptionList } from "./IconizedContextMenu";
+import { _t } from "../../../languageHandler";
+import {
+    leaveSpace,
+    shouldShowSpaceSettings,
+    showAddExistingRooms,
+    showCreateNewRoom,
+    showCreateNewSubspace,
+    showSpaceInvite,
+    showSpaceSettings,
+} from "../../../utils/space";
+import MatrixClientContext from "../../../contexts/MatrixClientContext";
+import { ButtonEvent } from "../elements/AccessibleButton";
+import defaultDispatcher from "../../../dispatcher/dispatcher";
+import RoomViewStore from "../../../stores/RoomViewStore";
+import { SetRightPanelPhasePayload } from "../../../dispatcher/payloads/SetRightPanelPhasePayload";
+import { Action } from "../../../dispatcher/actions";
+import { RightPanelPhases } from "../../../stores/RightPanelStorePhases";
+import { BetaPill } from "../beta/BetaCard";
+
+interface IProps extends IContextMenuProps {
+    space: Room;
+}
+
+const SpaceContextMenu = ({ space, onFinished, ...props }: IProps) => {
+    const cli = useContext(MatrixClientContext);
+    const userId = cli.getUserId();
+
+    let inviteOption;
+    if (space.getJoinRule() === "public" || space.canInvite(userId)) {
+        const onInviteClick = (ev: ButtonEvent) => {
+            ev.preventDefault();
+            ev.stopPropagation();
+
+            showSpaceInvite(space);
+            onFinished();
+        };
+
+        inviteOption = (
+            <IconizedContextMenuOption
+                className="mx_SpacePanel_contextMenu_inviteButton"
+                iconClassName="mx_SpacePanel_iconInvite"
+                label={_t("Invite people")}
+                onClick={onInviteClick}
+            />
+        );
+    }
+
+    let settingsOption;
+    let leaveSection;
+    if (shouldShowSpaceSettings(space)) {
+        const onSettingsClick = (ev: ButtonEvent) => {
+            ev.preventDefault();
+            ev.stopPropagation();
+
+            showSpaceSettings(space);
+            onFinished();
+        };
+
+        settingsOption = (
+            <IconizedContextMenuOption
+                iconClassName="mx_SpacePanel_iconSettings"
+                label={_t("Settings")}
+                onClick={onSettingsClick}
+            />
+        );
+    } else {
+        const onLeaveClick = (ev: ButtonEvent) => {
+            ev.preventDefault();
+            ev.stopPropagation();
+
+            leaveSpace(space);
+            onFinished();
+        };
+
+        leaveSection = <IconizedContextMenuOptionList red first>
+            <IconizedContextMenuOption
+                iconClassName="mx_SpacePanel_iconLeave"
+                label={_t("Leave space")}
+                onClick={onLeaveClick}
+            />
+        </IconizedContextMenuOptionList>;
+    }
+
+    const canAddRooms = space.currentState.maySendStateEvent(EventType.SpaceChild, userId);
+
+    let newRoomSection;
+    if (space.currentState.maySendStateEvent(EventType.SpaceChild, userId)) {
+        const onNewRoomClick = (ev: ButtonEvent) => {
+            ev.preventDefault();
+            ev.stopPropagation();
+
+            showCreateNewRoom(space);
+            onFinished();
+        };
+
+        const onAddExistingRoomClick = (ev: ButtonEvent) => {
+            ev.preventDefault();
+            ev.stopPropagation();
+
+            showAddExistingRooms(space);
+            onFinished();
+        };
+
+        const onNewSubspaceClick = (ev: ButtonEvent) => {
+            ev.preventDefault();
+            ev.stopPropagation();
+
+            showCreateNewSubspace(space);
+            onFinished();
+        };
+
+        newRoomSection = <IconizedContextMenuOptionList first>
+            <IconizedContextMenuOption
+                iconClassName="mx_SpacePanel_iconPlus"
+                label={_t("Create new room")}
+                onClick={onNewRoomClick}
+            />
+            <IconizedContextMenuOption
+                iconClassName="mx_SpacePanel_iconHash"
+                label={_t("Add existing room")}
+                onClick={onAddExistingRoomClick}
+            />
+            <IconizedContextMenuOption
+                iconClassName="mx_SpacePanel_iconPlus"
+                label={_t("Add space")}
+                onClick={onNewSubspaceClick}
+            >
+                <BetaPill />
+            </IconizedContextMenuOption>
+        </IconizedContextMenuOptionList>;
+    }
+
+    const onMembersClick = (ev: ButtonEvent) => {
+        ev.preventDefault();
+        ev.stopPropagation();
+
+        if (!RoomViewStore.getRoomId()) {
+            defaultDispatcher.dispatch({
+                action: "view_room",
+                room_id: space.roomId,
+            }, true);
+        }
+
+        defaultDispatcher.dispatch<SetRightPanelPhasePayload>({
+            action: Action.SetRightPanelPhase,
+            phase: RightPanelPhases.SpaceMemberList,
+            refireParams: { space: space },
+        });
+        onFinished();
+    };
+
+    const onExploreRoomsClick = (ev: ButtonEvent) => {
+        ev.preventDefault();
+        ev.stopPropagation();
+
+        defaultDispatcher.dispatch({
+            action: "view_room",
+            room_id: space.roomId,
+        });
+        onFinished();
+    };
+
+    return <IconizedContextMenu
+        {...props}
+        onFinished={onFinished}
+        className="mx_SpacePanel_contextMenu"
+        compact
+    >
+        <div className="mx_SpacePanel_contextMenu_header">
+            { space.name }
+        </div>
+        <IconizedContextMenuOptionList first>
+            { inviteOption }
+            <IconizedContextMenuOption
+                iconClassName="mx_SpacePanel_iconMembers"
+                label={_t("Members")}
+                onClick={onMembersClick}
+            />
+            { settingsOption }
+            <IconizedContextMenuOption
+                iconClassName="mx_SpacePanel_iconExplore"
+                label={canAddRooms ? _t("Manage & explore rooms") : _t("Explore rooms")}
+                onClick={onExploreRoomsClick}
+            />
+        </IconizedContextMenuOptionList>
+        { newRoomSection }
+        { leaveSection }
+    </IconizedContextMenu>;
+};
+
+export default SpaceContextMenu;
+

src/components/views/context_menus/StatusMessageContextMenu.js

@@ -99,20 +99,22 @@ export default class StatusMessageContextMenu extends React.Component {
                 actionButton = <AccessibleButton className="mx_StatusMessageContextMenu_clear"
                     onClick={this._onClearClick}
                 >
-                    <span>{_t("Clear status")}</span>
+                    <span>{ _t("Clear status") }</span>
                 </AccessibleButton>;
             } else {
                 actionButton = <AccessibleButton className="mx_StatusMessageContextMenu_submit"
                     onClick={this._onSubmit}
                 >
-                    <span>{_t("Update status")}</span>
+                    <span>{ _t("Update status") }</span>
                 </AccessibleButton>;
             }
         } else {
-            actionButton = <AccessibleButton className="mx_StatusMessageContextMenu_submit"
-                disabled={!this.state.message} onClick={this._onSubmit}
+            actionButton = <AccessibleButton
+                className="mx_StatusMessageContextMenu_submit"
+                disabled={!this.state.message}
+                onClick={this._onSubmit}
             >
-                <span>{_t("Set status")}</span>
+                <span>{ _t("Set status") }</span>
             </AccessibleButton>;
         }
 
@@ -121,17 +123,24 @@ export default class StatusMessageContextMenu extends React.Component {
             spinner = <Spinner w="24" h="24" />;
         }
 
-        const form = <form className="mx_StatusMessageContextMenu_form"
-            autoComplete="off" onSubmit={this._onSubmit}
+        const form = <form
+            className="mx_StatusMessageContextMenu_form"
+            autoComplete="off"
+            onSubmit={this._onSubmit}
         >
-            <input type="text" className="mx_StatusMessageContextMenu_message"
-                key="message" placeholder={_t("Set a new status...")}
-                autoFocus={true} maxLength="60" value={this.state.message}
+            <input
+                type="text"
+                className="mx_StatusMessageContextMenu_message"
+                key="message"
+                placeholder={_t("Set a new status...")}
+                autoFocus={true}
+                maxLength="60"
+                value={this.state.message}
                 onChange={this._onStatusChange}
             />
             <div className="mx_StatusMessageContextMenu_actionContainer">
-                {actionButton}
-                {spinner}
+                { actionButton }
+                { spinner }
             </div>
         </form>;
 

src/components/views/context_menus/WidgetContextMenu.tsx

@@ -76,7 +76,8 @@ const WidgetContextMenu: React.FC<IProps> = ({
             onFinished();
         };
         streamAudioStreamButton = <IconizedContextMenuOption
-            onClick={onStreamAudioClick} label={_t("Start audio stream")}
+            onClick={onStreamAudioClick}
+            label={_t("Start audio stream")}
         />;
     }
 

src/components/views/dialogs/AddExistingSubspaceDialog.tsx

@@ -0,0 +1,67 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React, { useState } from "react";
+import { Room } from "matrix-js-sdk/src/models/room";
+
+import { _t } from '../../../languageHandler';
+import BaseDialog from "./BaseDialog";
+import AccessibleButton from "../elements/AccessibleButton";
+import MatrixClientContext from "../../../contexts/MatrixClientContext";
+import { AddExistingToSpace, defaultSpacesRenderer, SubspaceSelector } from "./AddExistingToSpaceDialog";
+
+interface IProps {
+    space: Room;
+    onCreateSubspaceClick(): void;
+    onFinished(added?: boolean): void;
+}
+
+const AddExistingSubspaceDialog: React.FC<IProps> = ({ space, onCreateSubspaceClick, onFinished }) => {
+    const [selectedSpace, setSelectedSpace] = useState(space);
+
+    return <BaseDialog
+        title={(
+            <SubspaceSelector
+                title={_t("Add existing space")}
+                space={space}
+                value={selectedSpace}
+                onChange={setSelectedSpace}
+            />
+        )}
+        className="mx_AddExistingToSpaceDialog"
+        contentId="mx_AddExistingToSpace"
+        onFinished={onFinished}
+        fixedWidth={false}
+    >
+        <MatrixClientContext.Provider value={space.client}>
+            <AddExistingToSpace
+                space={space}
+                onFinished={onFinished}
+                footerPrompt={<>
+                    <div>{ _t("Want to add a new space instead?") }</div>
+                    <AccessibleButton onClick={onCreateSubspaceClick} kind="link">
+                        { _t("Create a new space") }
+                    </AccessibleButton>
+                </>}
+                filterPlaceholder={_t("Search for spaces")}
+                spacesRenderer={defaultSpacesRenderer}
+            />
+        </MatrixClientContext.Provider>
+    </BaseDialog>;
+};
+
+export default AddExistingSubspaceDialog;
+

src/components/views/dialogs/AddExistingToSpaceDialog.tsx

@@ -17,11 +17,10 @@ limitations under the License.
 import React, { ReactNode, useContext, useMemo, useState } from "react";
 import classNames from "classnames";
 import { Room } from "matrix-js-sdk/src/models/room";
-import { MatrixClient } from "matrix-js-sdk/src/client";
 import { sleep } from "matrix-js-sdk/src/utils";
+import { EventType } from "matrix-js-sdk/src/@types/event";
 
 import { _t } from '../../../languageHandler';
-import { IDialogProps } from "./IDialogProps";
 import BaseDialog from "./BaseDialog";
 import Dropdown from "../elements/Dropdown";
 import SearchBox from "../../structures/SearchBox";
@@ -36,20 +35,20 @@ import StyledCheckbox from "../elements/StyledCheckbox";
 import MatrixClientContext from "../../../contexts/MatrixClientContext";
 import { sortRooms } from "../../../stores/room-list/algorithms/tag-sorting/RecentAlgorithm";
 import ProgressBar from "../elements/ProgressBar";
-import { SpaceFeedbackPrompt } from "../../structures/SpaceRoomView";
 import DecoratedRoomAvatar from "../avatars/DecoratedRoomAvatar";
 import QueryMatcher from "../../../autocomplete/QueryMatcher";
 import TruncatedList from "../elements/TruncatedList";
 import EntityTile from "../rooms/EntityTile";
 import BaseAvatar from "../avatars/BaseAvatar";
 
-interface IProps extends IDialogProps {
-    matrixClient: MatrixClient;
+interface IProps {
     space: Room;
-    onCreateRoomClick(cli: MatrixClient, space: Room): void;
+    onCreateRoomClick(): void;
+    onAddSubspaceClick(): void;
+    onFinished(added?: boolean): void;
 }
 
-const Entry = ({ room, checked, onChange }) => {
+export const Entry = ({ room, checked, onChange }) => {
     return <label className="mx_AddExistingToSpace_entry">
         { room?.isSpaceRoom()
             ? <RoomAvatar room={room} height={32} width={32} />
@@ -67,14 +66,36 @@ const Entry = ({ room, checked, onChange }) => {
 interface IAddExistingToSpaceProps {
     space: Room;
     footerPrompt?: ReactNode;
+    filterPlaceholder: string;
     emptySelectionButton?: ReactNode;
     onFinished(added: boolean): void;
+    roomsRenderer?(
+        rooms: Room[],
+        selectedToAdd: Set<Room>,
+        onChange: undefined | ((checked: boolean, room: Room) => void),
+        truncateAt: number,
+        overflowTile: (overflowCount: number, totalCount: number) => JSX.Element,
+    ): ReactNode;
+    spacesRenderer?(
+        spaces: Room[],
+        selectedToAdd: Set<Room>,
+        onChange?: (checked: boolean, room: Room) => void,
+    ): ReactNode;
+    dmsRenderer?(
+        dms: Room[],
+        selectedToAdd: Set<Room>,
+        onChange?: (checked: boolean, room: Room) => void,
+    ): ReactNode;
 }
 
 export const AddExistingToSpace: React.FC<IAddExistingToSpaceProps> = ({
     space,
     footerPrompt,
     emptySelectionButton,
+    filterPlaceholder,
+    roomsRenderer,
+    dmsRenderer,
+    spacesRenderer,
     onFinished,
 }) => {
     const cli = useContext(MatrixClientContext);
@@ -198,7 +219,7 @@ export const AddExistingToSpace: React.FC<IAddExistingToSpaceProps> = ({
         </>;
     }
 
-    const onChange = !busy && !error ? (checked, room) => {
+    const onChange = !busy && !error ? (checked: boolean, room: Room) => {
         if (checked) {
             selectedToAdd.add(room);
         } else {
@@ -208,83 +229,52 @@ export const AddExistingToSpace: React.FC<IAddExistingToSpaceProps> = ({
     } : null;
 
     const [truncateAt, setTruncateAt] = useState(20);
-    function overflowTile(overflowCount, totalCount) {
+    function overflowTile(overflowCount: number, totalCount: number): JSX.Element {
         const text = _t("and %(count)s others...", { count: overflowCount });
         return (
-            <EntityTile className="mx_EntityTile_ellipsis" avatarJsx={
-                <BaseAvatar url={require("../../../../res/img/ellipsis.svg")} name="..." width={36} height={36} />
-            } name={text} presenceState="online" suppressOnHover={true}
-            onClick={() => setTruncateAt(totalCount)} />
+            <EntityTile
+                className="mx_EntityTile_ellipsis"
+                avatarJsx={
+                    <BaseAvatar url={require("../../../../res/img/ellipsis.svg")} name="..." width={36} height={36} />
+                }
+                name={text}
+                presenceState="online"
+                suppressOnHover={true}
+                onClick={() => setTruncateAt(totalCount)}
+            />
         );
     }
 
+    let noResults = true;
+    if ((roomsRenderer && rooms.length > 0) ||
+        (dmsRenderer && dms.length > 0) ||
+        (!roomsRenderer && !dmsRenderer && spacesRenderer && spaces.length > 0) // only count spaces when alone
+    ) {
+        noResults = false;
+    }
+
     return <div className="mx_AddExistingToSpace">
         <SearchBox
             className="mx_textinput_icon mx_textinput_search"
-            placeholder={ _t("Filter your rooms and spaces") }
+            placeholder={filterPlaceholder}
             onSearch={setQuery}
             autoComplete={true}
             autoFocus={true}
         />
         <AutoHideScrollbar className="mx_AddExistingToSpace_content">
-            { rooms.length > 0 ? (
-                <div className="mx_AddExistingToSpace_section">
-                    <h3>{ _t("Rooms") }</h3>
-                    <TruncatedList
-                        truncateAt={truncateAt}
-                        createOverflowElement={overflowTile}
-                        getChildren={(start, end) => rooms.slice(start, end).map(room =>
-                            <Entry
-                                key={room.roomId}
-                                room={room}
-                                checked={selectedToAdd.has(room)}
-                                onChange={onChange ? (checked) => {
-                                    onChange(checked, room);
-                                } : null}
-                            />,
-                        )}
-                        getChildCount={() => rooms.length}
-                    />
-                </div>
+            { rooms.length > 0 && roomsRenderer ? (
+                roomsRenderer(rooms, selectedToAdd, onChange, truncateAt, overflowTile)
             ) : undefined }
 
-            { spaces.length > 0 ? (
-                <div className="mx_AddExistingToSpace_section mx_AddExistingToSpace_section_spaces">
-                    <h3>{ _t("Spaces") }</h3>
-                    <div className="mx_AddExistingToSpace_section_experimental">
-                        <div>{ _t("Feeling experimental?") }</div>
-                        <div>{ _t("You can add existing spaces to a space.") }</div>
-                    </div>
-                    { spaces.map(space => {
-                        return <Entry
-                            key={space.roomId}
-                            room={space}
-                            checked={selectedToAdd.has(space)}
-                            onChange={onChange ? (checked) => {
-                                onChange(checked, space);
-                            } : null}
-                        />;
-                    }) }
-                </div>
+            { spaces.length > 0 && spacesRenderer ? (
+                spacesRenderer(spaces, selectedToAdd, onChange)
             ) : null }
 
-            { dms.length > 0 ? (
-                <div className="mx_AddExistingToSpace_section">
-                    <h3>{ _t("Direct Messages") }</h3>
-                    { dms.map(room => {
-                        return <Entry
-                            key={room.roomId}
-                            room={room}
-                            checked={selectedToAdd.has(room)}
-                            onChange={onChange ? (checked) => {
-                                onChange(checked, room);
-                            } : null}
-                        />;
-                    }) }
-                </div>
+            { dms.length > 0 && dmsRenderer ? (
+                dmsRenderer(dms, selectedToAdd, onChange)
             ) : null }
 
-            { spaces.length + rooms.length + dms.length < 1 ? <span className="mx_AddExistingToSpace_noResults">
+            { noResults ? <span className="mx_AddExistingToSpace_noResults">
                 { _t("No results") }
             </span> : undefined }
         </AutoHideScrollbar>
@@ -295,69 +285,166 @@ export const AddExistingToSpace: React.FC<IAddExistingToSpaceProps> = ({
     </div>;
 };
 
-const AddExistingToSpaceDialog: React.FC<IProps> = ({ matrixClient: cli, space, onCreateRoomClick, onFinished }) => {
-    const [selectedSpace, setSelectedSpace] = useState(space);
-    const existingSubspaces = SpaceStore.instance.getChildSpaces(space.roomId);
+export const defaultRoomsRenderer: IAddExistingToSpaceProps["roomsRenderer"] = (
+    rooms, selectedToAdd, onChange, truncateAt, overflowTile,
+) => (
+    <div className="mx_AddExistingToSpace_section">
+        <h3>{ _t("Rooms") }</h3>
+        <TruncatedList
+            truncateAt={truncateAt}
+            createOverflowElement={overflowTile}
+            getChildren={(start, end) => rooms.slice(start, end).map(room =>
+                <Entry
+                    key={room.roomId}
+                    room={room}
+                    checked={selectedToAdd.has(room)}
+                    onChange={onChange ? (checked: boolean) => {
+                        onChange(checked, room);
+                    } : null}
+                />,
+            )}
+            getChildCount={() => rooms.length}
+        />
+    </div>
+);
 
-    let spaceOptionSection;
-    if (existingSubspaces.length > 0) {
-        const options = [space, ...existingSubspaces].map((space) => {
-            const classes = classNames("mx_AddExistingToSpaceDialog_dropdownOption", {
-                mx_AddExistingToSpaceDialog_dropdownOptionActive: space === selectedSpace,
-            });
-            return <div key={space.roomId} className={classes}>
-                <RoomAvatar room={space} width={24} height={24} />
-                { space.name || getDisplayAliasForRoom(space) || space.roomId }
-            </div>;
-        });
+export const defaultSpacesRenderer: IAddExistingToSpaceProps["spacesRenderer"] = (spaces, selectedToAdd, onChange) => (
+    <div className="mx_AddExistingToSpace_section">
+        { spaces.map(space => {
+            return <Entry
+                key={space.roomId}
+                room={space}
+                checked={selectedToAdd.has(space)}
+                onChange={onChange ? (checked) => {
+                    onChange(checked, space);
+                } : null}
+            />;
+        }) }
+    </div>
+);
 
-        spaceOptionSection = (
+export const defaultDmsRenderer: IAddExistingToSpaceProps["dmsRenderer"] = (dms, selectedToAdd, onChange) => (
+    <div className="mx_AddExistingToSpace_section">
+        <h3>{ _t("Direct Messages") }</h3>
+        { dms.map(room => {
+            return <Entry
+                key={room.roomId}
+                room={room}
+                checked={selectedToAdd.has(room)}
+                onChange={onChange ? (checked: boolean) => {
+                    onChange(checked, room);
+                } : null}
+            />;
+        }) }
+    </div>
+);
+
+interface ISubspaceSelectorProps {
+    title: string;
+    space: Room;
+    value: Room;
+    onChange(space: Room): void;
+}
+
+export const SubspaceSelector = ({ title, space, value, onChange }: ISubspaceSelectorProps) => {
+    const options = useMemo(() => {
+        return [space, ...SpaceStore.instance.getChildSpaces(space.roomId).filter(space => {
+            return space.currentState.maySendStateEvent(EventType.SpaceChild, space.client.credentials.userId);
+        })];
+    }, [space]);
+
+    let body;
+    if (options.length > 1) {
+        body = (
             <Dropdown
                 id="mx_SpaceSelectDropdown"
+                className="mx_SpaceSelectDropdown"
                 onOptionChange={(key: string) => {
-                    setSelectedSpace(existingSubspaces.find(space => space.roomId === key) || space);
+                    onChange(options.find(space => space.roomId === key) || space);
                 }}
-                value={selectedSpace.roomId}
+                value={value.roomId}
                 label={_t("Space selection")}
             >
-                { options }
+                { options.map((space) => {
+                    const classes = classNames({
+                        mx_SubspaceSelector_dropdownOptionActive: space === value,
+                    });
+                    return <div key={space.roomId} className={classes}>
+                        <RoomAvatar room={space} width={24} height={24} />
+                        { space.name || getDisplayAliasForRoom(space) || space.roomId }
+                    </div>;
+                }) }
             </Dropdown>
         );
     } else {
-        spaceOptionSection = <div className="mx_AddExistingToSpaceDialog_onlySpace">
-            { space.name || getDisplayAliasForRoom(space) || space.roomId }
-        </div>;
+        body = (
+            <div className="mx_SubspaceSelector_onlySpace">
+                { space.name || getDisplayAliasForRoom(space) || space.roomId }
+            </div>
+        );
     }
 
-    const title = <React.Fragment>
-        <RoomAvatar room={selectedSpace} height={40} width={40} />
+    return <div className="mx_SubspaceSelector">
+        <RoomAvatar room={value} height={40} width={40} />
         <div>
-            <h1>{ _t("Add existing rooms") }</h1>
-            { spaceOptionSection }
+            <h1>{ title }</h1>
+            { body }
         </div>
-    </React.Fragment>;
+    </div>;
+};
+
+const AddExistingToSpaceDialog: React.FC<IProps> = ({ space, onCreateRoomClick, onAddSubspaceClick, onFinished }) => {
+    const [selectedSpace, setSelectedSpace] = useState(space);
 
     return <BaseDialog
-        title={title}
+        title={(
+            <SubspaceSelector
+                title={_t("Add existing rooms")}
+                space={space}
+                value={selectedSpace}
+                onChange={setSelectedSpace}
+            />
+        )}
         className="mx_AddExistingToSpaceDialog"
         contentId="mx_AddExistingToSpace"
         onFinished={onFinished}
         fixedWidth={false}
     >
-        <MatrixClientContext.Provider value={cli}>
+        <MatrixClientContext.Provider value={space.client}>
             <AddExistingToSpace
                 space={space}
                 onFinished={onFinished}
                 footerPrompt={<>
                     <div>{ _t("Want to add a new room instead?") }</div>
-                    <AccessibleButton onClick={() => onCreateRoomClick(cli, space)} kind="link">
+                    <AccessibleButton
+                        kind="link"
+                        onClick={() => {
+                            onCreateRoomClick();
+                            onFinished();
+                        }}
+                    >
                         { _t("Create a new room") }
                     </AccessibleButton>
                 </>}
+                filterPlaceholder={_t("Search for rooms")}
+                roomsRenderer={defaultRoomsRenderer}
+                spacesRenderer={() => (
+                    <div className="mx_AddExistingToSpace_section">
+                        <h3>{ _t("Spaces") }</h3>
+                        <AccessibleButton
+                            kind="link"
+                            onClick={() => {
+                                onAddSubspaceClick();
+                                onFinished();
+                            }}
+                        >
+                            { _t("Adding spaces has moved.") }
+                        </AccessibleButton>
+                    </div>
+                )}
+                dmsRenderer={defaultDmsRenderer}
             />
         </MatrixClientContext.Provider>
-
-        <SpaceFeedbackPrompt onClick={() => onFinished(false)} />
     </BaseDialog>;
 };
 

src/components/views/dialogs/AddressPickerDialog.tsx

@@ -18,14 +18,12 @@ limitations under the License.
 */
 
 import React, { createRef } from 'react';
-import PropTypes from 'prop-types';
 import { sleep } from "matrix-js-sdk/src/utils";
 
 import { _t, _td } from '../../../languageHandler';
-import * as sdk from '../../../index';
 import { MatrixClientPeg } from '../../../MatrixClientPeg';
 import dis from '../../../dispatcher/dispatcher';
-import { addressTypes, getAddressType } from '../../../UserAddress';
+import { AddressType, addressTypes, getAddressType, IUserAddress } from '../../../UserAddress';
 import GroupStore from '../../../stores/GroupStore';
 import * as Email from '../../../email';
 import IdentityAuthClient from '../../../IdentityAuthClient';
@@ -34,6 +32,10 @@ import { abbreviateUrl } from '../../../utils/UrlUtils';
 import { Key } from "../../../Keyboard";
 import { Action } from "../../../dispatcher/actions";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import AddressSelector from '../elements/AddressSelector';
+import AddressTile from '../elements/AddressTile';
+import BaseDialog from "./BaseDialog";
+import DialogButtons from "../elements/DialogButtons";
 
 const TRUNCATE_QUERY_LIST = 40;
 const QUERY_USER_DIRECTORY_DEBOUNCE_MS = 200;
@@ -44,29 +46,64 @@ const addressTypeName = {
     'email': _td("email address"),
 };
 
-@replaceableComponent("views.dialogs.AddressPickerDialog")
-export default class AddressPickerDialog extends React.Component {
-    static propTypes = {
-        title: PropTypes.string.isRequired,
-        description: PropTypes.node,
-        // Extra node inserted after picker input, dropdown and errors
-        extraNode: PropTypes.node,
-        value: PropTypes.string,
-        placeholder: PropTypes.oneOfType([PropTypes.string, PropTypes.func]),
-        roomId: PropTypes.string,
-        button: PropTypes.string,
-        focus: PropTypes.bool,
-        validAddressTypes: PropTypes.arrayOf(PropTypes.oneOf(addressTypes)),
-        onFinished: PropTypes.func.isRequired,
-        groupId: PropTypes.string,
-        // The type of entity to search for. Default: 'user'.
-        pickerType: PropTypes.oneOf(['user', 'room']),
-        // Whether the current user should be included in the addresses returned. Only
-        // applicable when pickerType is `user`. Default: false.
-        includeSelf: PropTypes.bool,
-    };
+interface IResult {
+    user_id: string; // eslint-disable-line camelcase
+    room_id?: string; // eslint-disable-line camelcase
+    name?: string;
+    display_name?: string; // eslint-disable-line camelcase
+    avatar_url?: string;// eslint-disable-line camelcase
+}
 
-    static defaultProps = {
+interface IProps {
+    title: string;
+    description?: JSX.Element;
+    // Extra node inserted after picker input, dropdown and errors
+    extraNode?: JSX.Element;
+    value?: string;
+    placeholder?: ((validAddressTypes: any) => string) | string;
+    roomId?: string;
+    button?: string;
+    focus?: boolean;
+    validAddressTypes?: AddressType[];
+    onFinished: (success: boolean, list?: IUserAddress[]) => void;
+    groupId?: string;
+    // The type of entity to search for. Default: 'user'.
+    pickerType?: 'user' | 'room';
+    // Whether the current user should be included in the addresses returned. Only
+    // applicable when pickerType is `user`. Default: false.
+    includeSelf?: boolean;
+}
+
+interface IState {
+    // Whether to show an error message because of an invalid address
+    invalidAddressError: boolean;
+    // List of UserAddressType objects representing
+    // the list of addresses we're going to invite
+    selectedList: IUserAddress[];
+    // Whether a search is ongoing
+    busy: boolean;
+    // An error message generated during the user directory search
+    searchError: string;
+    // Whether the server supports the user_directory API
+    serverSupportsUserDirectory: boolean;
+    // The query being searched for
+    query: string;
+    // List of UserAddressType objects representing the set of
+    // auto-completion results for the current search query.
+    suggestedList: IUserAddress[];
+    // List of address types initialised from props, but may change while the
+    // dialog is open and represents the supported list of address types at this time.
+    validAddressTypes: AddressType[];
+}
+
+@replaceableComponent("views.dialogs.AddressPickerDialog")
+export default class AddressPickerDialog extends React.Component<IProps, IState> {
+    private textinput = createRef<HTMLTextAreaElement>();
+    private addressSelector = createRef<AddressSelector>();
+    private queryChangedDebouncer: number;
+    private cancelThreepidLookup: () => void;
+
+    static defaultProps: Partial<IProps> = {
         value: "",
         focus: true,
         validAddressTypes: addressTypes,
@@ -74,36 +111,23 @@ export default class AddressPickerDialog extends React.Component {
         includeSelf: false,
     };
 
-    constructor(props) {
+    constructor(props: IProps) {
         super(props);
 
-        this._textinput = createRef();
-
         let validAddressTypes = this.props.validAddressTypes;
         // Remove email from validAddressTypes if no IS is configured. It may be added at a later stage by the user
-        if (!MatrixClientPeg.get().getIdentityServerUrl() && validAddressTypes.includes("email")) {
-            validAddressTypes = validAddressTypes.filter(type => type !== "email");
+        if (!MatrixClientPeg.get().getIdentityServerUrl() && validAddressTypes.includes(AddressType.Email)) {
+            validAddressTypes = validAddressTypes.filter(type => type !== AddressType.Email);
         }
 
         this.state = {
-            // Whether to show an error message because of an invalid address
             invalidAddressError: false,
-            // List of UserAddressType objects representing
-            // the list of addresses we're going to invite
             selectedList: [],
-            // Whether a search is ongoing
             busy: false,
-            // An error message generated during the user directory search
             searchError: null,
-            // Whether the server supports the user_directory API
             serverSupportsUserDirectory: true,
-            // The query being searched for
             query: "",
-            // List of UserAddressType objects representing the set of
-            // auto-completion results for the current search query.
             suggestedList: [],
-            // List of address types initialised from props, but may change while the
-            // dialog is open and represents the supported list of address types at this time.
             validAddressTypes,
         };
     }
@@ -111,11 +135,11 @@ export default class AddressPickerDialog extends React.Component {
     componentDidMount() {
         if (this.props.focus) {
             // Set the cursor at the end of the text input
-            this._textinput.current.value = this.props.value;
+            this.textinput.current.value = this.props.value;
         }
     }
 
-    getPlaceholder() {
+    private getPlaceholder(): string {
         const { placeholder } = this.props;
         if (typeof placeholder === "string") {
             return placeholder;
@@ -124,23 +148,23 @@ export default class AddressPickerDialog extends React.Component {
         return placeholder(this.state.validAddressTypes);
     }
 
-    onButtonClick = () => {
+    private onButtonClick = (): void => {
         let selectedList = this.state.selectedList.slice();
         // Check the text input field to see if user has an unconverted address
         // If there is and it's valid add it to the local selectedList
-        if (this._textinput.current.value !== '') {
-            selectedList = this._addAddressesToList([this._textinput.current.value]);
+        if (this.textinput.current.value !== '') {
+            selectedList = this.addAddressesToList([this.textinput.current.value]);
             if (selectedList === null) return;
         }
         this.props.onFinished(true, selectedList);
     };
 
-    onCancel = () => {
+    private onCancel = (): void => {
         this.props.onFinished(false);
     };
 
-    onKeyDown = e => {
-        const textInput = this._textinput.current ? this._textinput.current.value : undefined;
+    private onKeyDown = (e: React.KeyboardEvent): void => {
+        const textInput = this.textinput.current ? this.textinput.current.value : undefined;
 
         if (e.key === Key.ESCAPE) {
             e.stopPropagation();
@@ -149,15 +173,15 @@ export default class AddressPickerDialog extends React.Component {
         } else if (e.key === Key.ARROW_UP) {
             e.stopPropagation();
             e.preventDefault();
-            if (this.addressSelector) this.addressSelector.moveSelectionUp();
+            if (this.addressSelector.current) this.addressSelector.current.moveSelectionUp();
         } else if (e.key === Key.ARROW_DOWN) {
             e.stopPropagation();
             e.preventDefault();
-            if (this.addressSelector) this.addressSelector.moveSelectionDown();
+            if (this.addressSelector.current) this.addressSelector.current.moveSelectionDown();
         } else if (this.state.suggestedList.length > 0 && [Key.COMMA, Key.ENTER, Key.TAB].includes(e.key)) {
             e.stopPropagation();
             e.preventDefault();
-            if (this.addressSelector) this.addressSelector.chooseSelection();
+            if (this.addressSelector.current) this.addressSelector.current.chooseSelection();
         } else if (textInput.length === 0 && this.state.selectedList.length && e.key === Key.BACKSPACE) {
             e.stopPropagation();
             e.preventDefault();
@@ -169,17 +193,17 @@ export default class AddressPickerDialog extends React.Component {
                 // if there's nothing in the input box, submit the form
                 this.onButtonClick();
             } else {
-                this._addAddressesToList([textInput]);
+                this.addAddressesToList([textInput]);
             }
         } else if (textInput && (e.key === Key.COMMA || e.key === Key.TAB)) {
             e.stopPropagation();
             e.preventDefault();
-            this._addAddressesToList([textInput]);
+            this.addAddressesToList([textInput]);
         }
     };
 
-    onQueryChanged = ev => {
-        const query = ev.target.value;
+    private onQueryChanged = (ev: React.ChangeEvent): void => {
+        const query = (ev.target as HTMLTextAreaElement).value;
         if (this.queryChangedDebouncer) {
             clearTimeout(this.queryChangedDebouncer);
         }
@@ -188,17 +212,17 @@ export default class AddressPickerDialog extends React.Component {
             this.queryChangedDebouncer = setTimeout(() => {
                 if (this.props.pickerType === 'user') {
                     if (this.props.groupId) {
-                        this._doNaiveGroupSearch(query);
+                        this.doNaiveGroupSearch(query);
                     } else if (this.state.serverSupportsUserDirectory) {
-                        this._doUserDirectorySearch(query);
+                        this.doUserDirectorySearch(query);
                     } else {
-                        this._doLocalSearch(query);
+                        this.doLocalSearch(query);
                     }
                 } else if (this.props.pickerType === 'room') {
                     if (this.props.groupId) {
-                        this._doNaiveGroupRoomSearch(query);
+                        this.doNaiveGroupRoomSearch(query);
                     } else {
-                        this._doRoomSearch(query);
+                        this.doRoomSearch(query);
                     }
                 } else {
                     console.error('Unknown pickerType', this.props.pickerType);
@@ -213,7 +237,7 @@ export default class AddressPickerDialog extends React.Component {
         }
     };
 
-    onDismissed = index => () => {
+    private onDismissed = (index: number) => () => {
         const selectedList = this.state.selectedList.slice();
         selectedList.splice(index, 1);
         this.setState({
@@ -221,25 +245,21 @@ export default class AddressPickerDialog extends React.Component {
             suggestedList: [],
             query: "",
         });
-        if (this._cancelThreepidLookup) this._cancelThreepidLookup();
+        if (this.cancelThreepidLookup) this.cancelThreepidLookup();
     };
 
-    onClick = index => () => {
-        this.onSelected(index);
-    };
-
-    onSelected = index => {
+    private onSelected = (index: number): void => {
         const selectedList = this.state.selectedList.slice();
-        selectedList.push(this._getFilteredSuggestions()[index]);
+        selectedList.push(this.getFilteredSuggestions()[index]);
         this.setState({
             selectedList,
             suggestedList: [],
             query: "",
         });
-        if (this._cancelThreepidLookup) this._cancelThreepidLookup();
+        if (this.cancelThreepidLookup) this.cancelThreepidLookup();
     };
 
-    _doNaiveGroupSearch(query) {
+    private doNaiveGroupSearch(query: string): void {
         const lowerCaseQuery = query.toLowerCase();
         this.setState({
             busy: true,
@@ -260,7 +280,7 @@ export default class AddressPickerDialog extends React.Component {
                     display_name: u.displayname,
                 });
             });
-            this._processResults(results, query);
+            this.processResults(results, query);
         }).catch((err) => {
             console.error('Error whilst searching group rooms: ', err);
             this.setState({
@@ -273,7 +293,7 @@ export default class AddressPickerDialog extends React.Component {
         });
     }
 
-    _doNaiveGroupRoomSearch(query) {
+    private doNaiveGroupRoomSearch(query: string): void {
         const lowerCaseQuery = query.toLowerCase();
         const results = [];
         GroupStore.getGroupRooms(this.props.groupId).forEach((r) => {
@@ -289,13 +309,13 @@ export default class AddressPickerDialog extends React.Component {
                 name: r.name || r.canonical_alias,
             });
         });
-        this._processResults(results, query);
+        this.processResults(results, query);
         this.setState({
             busy: false,
         });
     }
 
-    _doRoomSearch(query) {
+    private doRoomSearch(query: string): void {
         const lowerCaseQuery = query.toLowerCase();
         const rooms = MatrixClientPeg.get().getRooms();
         const results = [];
@@ -346,13 +366,13 @@ export default class AddressPickerDialog extends React.Component {
             return a.rank - b.rank;
         });
 
-        this._processResults(sortedResults, query);
+        this.processResults(sortedResults, query);
         this.setState({
             busy: false,
         });
     }
 
-    _doUserDirectorySearch(query) {
+    private doUserDirectorySearch(query: string): void {
         this.setState({
             busy: true,
             query,
@@ -366,7 +386,7 @@ export default class AddressPickerDialog extends React.Component {
             if (this.state.query !== query) {
                 return;
             }
-            this._processResults(resp.results, query);
+            this.processResults(resp.results, query);
         }).catch((err) => {
             console.error('Error whilst searching user directory: ', err);
             this.setState({
@@ -377,7 +397,7 @@ export default class AddressPickerDialog extends React.Component {
                     serverSupportsUserDirectory: false,
                 });
                 // Do a local search immediately
-                this._doLocalSearch(query);
+                this.doLocalSearch(query);
             }
         }).then(() => {
             this.setState({
@@ -386,7 +406,7 @@ export default class AddressPickerDialog extends React.Component {
         });
     }
 
-    _doLocalSearch(query) {
+    private doLocalSearch(query: string): void {
         this.setState({
             query,
             searchError: null,
@@ -407,10 +427,10 @@ export default class AddressPickerDialog extends React.Component {
                 avatar_url: user.avatarUrl,
             });
         });
-        this._processResults(results, query);
+        this.processResults(results, query);
     }
 
-    _processResults(results, query) {
+    private processResults(results: IResult[], query: string): void {
         const suggestedList = [];
         results.forEach((result) => {
             if (result.room_id) {
@@ -465,27 +485,27 @@ export default class AddressPickerDialog extends React.Component {
                 address: query,
                 isKnown: false,
             });
-            if (this._cancelThreepidLookup) this._cancelThreepidLookup();
+            if (this.cancelThreepidLookup) this.cancelThreepidLookup();
             if (addrType === 'email') {
-                this._lookupThreepid(addrType, query);
+                this.lookupThreepid(addrType, query);
             }
         }
         this.setState({
             suggestedList,
             invalidAddressError: false,
         }, () => {
-            if (this.addressSelector) this.addressSelector.moveSelectionTop();
+            if (this.addressSelector.current) this.addressSelector.current.moveSelectionTop();
         });
     }
 
-    _addAddressesToList(addressTexts) {
+    private addAddressesToList(addressTexts: string[]): IUserAddress[] {
         const selectedList = this.state.selectedList.slice();
 
         let hasError = false;
         addressTexts.forEach((addressText) => {
             addressText = addressText.trim();
             const addrType = getAddressType(addressText);
-            const addrObj = {
+            const addrObj: IUserAddress = {
                 addressType: addrType,
                 address: addressText,
                 isKnown: false,
@@ -504,7 +524,6 @@ export default class AddressPickerDialog extends React.Component {
                 const room = MatrixClientPeg.get().getRoom(addrObj.address);
                 if (room) {
                     addrObj.displayName = room.name;
-                    addrObj.avatarMxc = room.avatarUrl;
                     addrObj.isKnown = true;
                 }
             }
@@ -518,17 +537,17 @@ export default class AddressPickerDialog extends React.Component {
             query: "",
             invalidAddressError: hasError ? true : this.state.invalidAddressError,
         });
-        if (this._cancelThreepidLookup) this._cancelThreepidLookup();
+        if (this.cancelThreepidLookup) this.cancelThreepidLookup();
         return hasError ? null : selectedList;
     }
 
-    async _lookupThreepid(medium, address) {
+    private async lookupThreepid(medium: AddressType, address: string): Promise<string> {
         let cancelled = false;
         // Note that we can't safely remove this after we're done
         // because we don't know that it's the same one, so we just
         // leave it: it's replacing the old one each time so it's
         // not like they leak.
-        this._cancelThreepidLookup = function() {
+        this.cancelThreepidLookup = function() {
             cancelled = true;
         };
 
@@ -570,7 +589,7 @@ export default class AddressPickerDialog extends React.Component {
         }
     }
 
-    _getFilteredSuggestions() {
+    private getFilteredSuggestions(): IUserAddress[] {
         // map addressType => set of addresses to avoid O(n*m) operation
         const selectedAddresses = {};
         this.state.selectedList.forEach(({ address, addressType }) => {
@@ -584,15 +603,15 @@ export default class AddressPickerDialog extends React.Component {
         });
     }
 
-    _onPaste = e => {
+    private onPaste = (e: React.ClipboardEvent): void => {
         // Prevent the text being pasted into the textarea
         e.preventDefault();
         const text = e.clipboardData.getData("text");
         // Process it as a list of addresses to add instead
-        this._addAddressesToList(text.split(/[\s,]+/));
+        this.addAddressesToList(text.split(/[\s,]+/));
     };
 
-    onUseDefaultIdentityServerClick = e => {
+    private onUseDefaultIdentityServerClick = (e: React.MouseEvent): void => {
         e.preventDefault();
 
         // Update the IS in account data. Actually using it may trigger terms.
@@ -601,33 +620,27 @@ export default class AddressPickerDialog extends React.Component {
 
         // Add email as a valid address type.
         const { validAddressTypes } = this.state;
-        validAddressTypes.push('email');
+        validAddressTypes.push(AddressType.Email);
         this.setState({ validAddressTypes });
     };
 
-    onManageSettingsClick = e => {
+    private onManageSettingsClick = (e: React.MouseEvent): void => {
         e.preventDefault();
         dis.fire(Action.ViewUserSettings);
         this.onCancel();
     };
 
     render() {
-        const BaseDialog = sdk.getComponent('views.dialogs.BaseDialog');
-        const DialogButtons = sdk.getComponent('views.elements.DialogButtons');
-        const AddressSelector = sdk.getComponent("elements.AddressSelector");
-        this.scrollElement = null;
-
         let inputLabel;
         if (this.props.description) {
             inputLabel = <div className="mx_AddressPickerDialog_label">
-                <label htmlFor="textinput">{this.props.description}</label>
+                <label htmlFor="textinput">{ this.props.description }</label>
             </div>;
         }
 
         const query = [];
         // create the invite list
         if (this.state.selectedList.length > 0) {
-            const AddressTile = sdk.getComponent("elements.AddressTile");
             for (let i = 0; i < this.state.selectedList.length; i++) {
                 query.push(
                     <AddressTile
@@ -644,19 +657,19 @@ export default class AddressPickerDialog extends React.Component {
         query.push(
             <textarea
                 key={this.state.selectedList.length}
-                onPaste={this._onPaste}
-                rows="1"
+                onPaste={this.onPaste}
+                rows={1}
                 id="textinput"
-                ref={this._textinput}
+                ref={this.textinput}
                 className="mx_AddressPickerDialog_input"
                 onChange={this.onQueryChanged}
                 placeholder={this.getPlaceholder()}
                 defaultValue={this.props.value}
-                autoFocus={this.props.focus}>
-            </textarea>,
+                autoFocus={this.props.focus}
+            />,
         );
 
-        const filteredSuggestedList = this._getFilteredSuggestions();
+        const filteredSuggestedList = this.getFilteredSuggestions();
 
         let error;
         let addressSelector;
@@ -675,7 +688,7 @@ export default class AddressPickerDialog extends React.Component {
             error = <div className="mx_AddressPickerDialog_error">{ _t("No results") }</div>;
         } else {
             addressSelector = (
-                <AddressSelector ref={(ref) => {this.addressSelector = ref;}}
+                <AddressSelector ref={this.addressSelector}
                     addressList={filteredSuggestedList}
                     showAddress={this.props.pickerType === 'user'}
                     onSelected={this.onSelected}
@@ -686,11 +699,11 @@ export default class AddressPickerDialog extends React.Component {
 
         let identityServer;
         // If picker cannot currently accept e-mail but should be able to
-        if (this.props.pickerType === 'user' && !this.state.validAddressTypes.includes('email')
-            && this.props.validAddressTypes.includes('email')) {
+        if (this.props.pickerType === 'user' && !this.state.validAddressTypes.includes(AddressType.Email)
+            && this.props.validAddressTypes.includes(AddressType.Email)) {
             const defaultIdentityServerUrl = getDefaultIdentityServerUrl();
             if (defaultIdentityServerUrl) {
-                identityServer = <div className="mx_AddressPickerDialog_identityServer">{_t(
+                identityServer = <div className="mx_AddressPickerDialog_identityServer">{ _t(
                     "Use an identity server to invite by email. " +
                     "<default>Use the default (%(defaultIdentityServerName)s)</default> " +
                     "or manage in <settings>Settings</settings>.",
@@ -698,25 +711,29 @@ export default class AddressPickerDialog extends React.Component {
                         defaultIdentityServerName: abbreviateUrl(defaultIdentityServerUrl),
                     },
                     {
-                        default: sub => <a href="#" onClick={this.onUseDefaultIdentityServerClick}>{sub}</a>,
-                        settings: sub => <a href="#" onClick={this.onManageSettingsClick}>{sub}</a>,
+                        default: sub => <a href="#" onClick={this.onUseDefaultIdentityServerClick}>{ sub }</a>,
+                        settings: sub => <a href="#" onClick={this.onManageSettingsClick}>{ sub }</a>,
                     },
-                )}</div>;
+                ) }</div>;
             } else {
-                identityServer = <div className="mx_AddressPickerDialog_identityServer">{_t(
+                identityServer = <div className="mx_AddressPickerDialog_identityServer">{ _t(
                     "Use an identity server to invite by email. " +
                     "Manage in <settings>Settings</settings>.",
                     {}, {
-                        settings: sub => <a href="#" onClick={this.onManageSettingsClick}>{sub}</a>,
+                        settings: sub => <a href="#" onClick={this.onManageSettingsClick}>{ sub }</a>,
                     },
-                )}</div>;
+                ) }</div>;
             }
         }
 
         return (
-            <BaseDialog className="mx_AddressPickerDialog" onKeyDown={this.onKeyDown}
-                onFinished={this.props.onFinished} title={this.props.title}>
-                {inputLabel}
+            <BaseDialog
+                className="mx_AddressPickerDialog"
+                onKeyDown={this.onKeyDown}
+                onFinished={this.props.onFinished}
+                title={this.props.title}
+            >
+                { inputLabel }
                 <div className="mx_Dialog_content">
                     <div className="mx_AddressPickerDialog_inputContainer">{ query }</div>
                     { error }

src/components/views/dialogs/AskInviteAnywayDialog.tsx

@@ -51,7 +51,7 @@ export default class AskInviteAnywayDialog extends React.Component<IProps> {
 
     public render() {
         const errorList = this.props.unknownProfileUsers
-            .map(address => <li key={address.userId}>{address.userId}: {address.errorText}</li>);
+            .map(address => <li key={address.userId}>{ address.userId }: { address.errorText }</li>);
 
         return (
             <BaseDialog className='mx_RetryInvitesDialog'
@@ -60,8 +60,8 @@ export default class AskInviteAnywayDialog extends React.Component<IProps> {
                 contentId='mx_Dialog_content'
             >
                 <div id='mx_Dialog_content'>
-                    {/* eslint-disable-next-line */}
-                    <p>{_t("Unable to find profiles for the Matrix IDs listed below - would you like to invite them anyway?")}</p>
+                    <p>{ _t("Unable to find profiles for the Matrix IDs listed below - " +
+                        "would you like to invite them anyway?") }</p>
                     <ul>
                         { errorList }
                     </ul>

src/components/views/dialogs/BaseDialog.js

@@ -118,9 +118,7 @@ export default class BaseDialog extends React.Component {
 
         let headerImage;
         if (this.props.headerImage) {
-            headerImage = <img className="mx_Dialog_titleImage" src={this.props.headerImage}
-                alt=""
-            />;
+            headerImage = <img className="mx_Dialog_titleImage" src={this.props.headerImage} alt="" />;
         }
 
         return (
@@ -149,7 +147,7 @@ export default class BaseDialog extends React.Component {
                         'mx_Dialog_headerWithCancel': !!cancelButton,
                     })}>
                         <div className={classNames('mx_Dialog_title', this.props.titleClass)} id='mx_BaseDialog_title'>
-                            {headerImage}
+                            { headerImage }
                             { this.props.title }
                         </div>
                         { this.props.headerButton }

src/components/views/dialogs/BetaFeedbackDialog.tsx

@@ -14,22 +14,18 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import React, { useState } from "react";
+import React from "react";
 
-import QuestionDialog from './QuestionDialog';
 import { _t } from '../../../languageHandler';
-import Field from "../elements/Field";
-import SdkConfig from "../../../SdkConfig";
 import { IDialogProps } from "./IDialogProps";
 import SettingsStore from "../../../settings/SettingsStore";
-import { submitFeedback } from "../../../rageshake/submit-rageshake";
-import StyledCheckbox from "../elements/StyledCheckbox";
-import Modal from "../../../Modal";
-import InfoDialog from "./InfoDialog";
 import AccessibleButton from "../elements/AccessibleButton";
 import defaultDispatcher from "../../../dispatcher/dispatcher";
 import { Action } from "../../../dispatcher/actions";
 import { UserTab } from "./UserSettingsDialog";
+import GenericFeatureFeedbackDialog from "./GenericFeatureFeedbackDialog";
+
+// XXX: Keep this around for re-use in future Betas
 
 interface IProps extends IDialogProps {
     featureId: string;
@@ -38,74 +34,28 @@ interface IProps extends IDialogProps {
 const BetaFeedbackDialog: React.FC<IProps> = ({ featureId, onFinished }) => {
     const info = SettingsStore.getBetaInfo(featureId);
 
-    const [comment, setComment] = useState("");
-    const [canContact, setCanContact] = useState(false);
-
-    const sendFeedback = async (ok: boolean) => {
-        if (!ok) return onFinished(false);
-
-        const extraData = SettingsStore.getBetaInfo(featureId)?.extraSettings.reduce((o, k) => {
-            o[k] = SettingsStore.getValue(k);
-            return o;
-        }, {});
-
-        submitFeedback(SdkConfig.get().bug_report_endpoint_url, info.feedbackLabel, comment, canContact, extraData);
-        onFinished(true);
-
-        Modal.createTrackedDialog("Beta Dialog Sent", featureId, InfoDialog, {
-            title: _t("Beta feedback"),
-            description: _t("Thank you for your feedback, we really appreciate it."),
-            button: _t("Done"),
-            hasCloseButton: false,
-            fixedWidth: false,
-        });
-    };
-
-    return (<QuestionDialog
-        className="mx_BetaFeedbackDialog"
-        hasCancelButton={true}
+    return <GenericFeatureFeedbackDialog
         title={_t("%(featureName)s beta feedback", { featureName: info.title })}
-        description={<React.Fragment>
-            <div className="mx_BetaFeedbackDialog_subheading">
-                { _t(info.feedbackSubheading) }
-                &nbsp;
-                { _t("Your platform and username will be noted to help us use your feedback as much as we can.")}
-
-                <AccessibleButton kind="link" onClick={() => {
-                    onFinished(false);
-                    defaultDispatcher.dispatch({
-                        action: Action.ViewUserSettings,
-                        initialTabId: UserTab.Labs,
-                    });
-                }}>
-                    { _t("To leave the beta, visit your settings.") }
-                </AccessibleButton>
-            </div>
-
-            <Field
-                id="feedbackComment"
-                label={_t("Feedback")}
-                type="text"
-                autoComplete="off"
-                value={comment}
-                element="textarea"
-                onChange={(ev) => {
-                    setComment(ev.target.value);
-                }}
-                autoFocus={true}
-            />
-
-            <StyledCheckbox
-                checked={canContact}
-                onClick={e => setCanContact((e.target as HTMLInputElement).checked)}
-            >
-                { _t("You may contact me if you have any follow up questions") }
-            </StyledCheckbox>
-        </React.Fragment>}
-        button={_t("Send feedback")}
-        buttonDisabled={!comment}
-        onFinished={sendFeedback}
-    />);
+        subheading={_t(info.feedbackSubheading)}
+        onFinished={onFinished}
+        rageshakeLabel={info.feedbackLabel}
+        rageshakeData={Object.fromEntries((SettingsStore.getBetaInfo(featureId)?.extraSettings || []).map(k => {
+            return SettingsStore.getValue(k);
+        }))}
+    >
+        <AccessibleButton
+            kind="link"
+            onClick={() => {
+                onFinished(false);
+                defaultDispatcher.dispatch({
+                    action: Action.ViewUserSettings,
+                    initialTabId: UserTab.Labs,
+                });
+            }}
+        >
+            { _t("To leave the beta, visit your settings.") }
+        </AccessibleButton>
+    </GenericFeatureFeedbackDialog>;
 };
 
 export default BetaFeedbackDialog;

src/components/views/dialogs/BugReportDialog.tsx

@@ -166,7 +166,7 @@ export default class BugReportDialog extends React.Component<IProps, IState> {
         let error = null;
         if (this.state.err) {
             error = <div className="error">
-                {this.state.err}
+                { this.state.err }
             </div>;
         }
 
@@ -175,7 +175,7 @@ export default class BugReportDialog extends React.Component<IProps, IState> {
             progress = (
                 <div className="progress">
                     <Spinner />
-                    {this.state.progress} ...
+                    { this.state.progress } ...
                 </div>
             );
         }
@@ -188,7 +188,9 @@ export default class BugReportDialog extends React.Component<IProps, IState> {
         }
 
         return (
-            <BaseDialog className="mx_BugReportDialog" onFinished={this.onCancel}
+            <BaseDialog
+                className="mx_BugReportDialog"
+                onFinished={this.onCancel}
                 title={_t('Submit debug logs')}
                 contentId='mx_Dialog_content'
             >
@@ -221,7 +223,7 @@ export default class BugReportDialog extends React.Component<IProps, IState> {
                         <AccessibleButton onClick={this.onDownload} kind="link" disabled={this.state.downloadBusy}>
                             { _t("Download logs") }
                         </AccessibleButton>
-                        {this.state.downloadProgress && <span>{this.state.downloadProgress} ...</span>}
+                        { this.state.downloadProgress && <span>{ this.state.downloadProgress } ...</span> }
                     </div>
 
                     <Field
@@ -246,8 +248,8 @@ export default class BugReportDialog extends React.Component<IProps, IState> {
                             "please include those things here.",
                         )}
                     />
-                    {progress}
-                    {error}
+                    { progress }
+                    { error }
                 </div>
                 <DialogButtons primaryButton={_t("Send logs")}
                     onPrimaryButtonClick={this.onSubmit}

src/components/views/dialogs/ChangelogDialog.tsx

@@ -59,7 +59,7 @@ export default class ChangelogDialog extends React.Component<IProps> {
         return (
             <li key={commit.sha} className="mx_ChangelogDialog_li">
                 <a href={commit.html_url} target="_blank" rel="noreferrer noopener">
-                    {commit.commit.message.split('\n')[0]}
+                    { commit.commit.message.split('\n')[0] }
                 </a>
             </li>
         );
@@ -79,15 +79,15 @@ export default class ChangelogDialog extends React.Component<IProps> {
             }
             return (
                 <div key={repo}>
-                    <h2>{repo}</h2>
-                    <ul>{content}</ul>
+                    <h2>{ repo }</h2>
+                    <ul>{ content }</ul>
                 </div>
             );
         });
 
         const content = (
             <div className="mx_ChangelogDialog_content">
-                {this.props.version == null || this.props.newVersion == null ? <h2>{_t("Unavailable")}</h2> : logs}
+                { this.props.version == null || this.props.newVersion == null ? <h2>{ _t("Unavailable") }</h2> : logs }
             </div>
         );
 

src/components/views/dialogs/CommunityPrototypeInviteDialog.tsx

@@ -156,8 +156,8 @@ export default class CommunityPrototypeInviteDialog extends React.PureComponent<
                     height={avatarSize}
                 />
                 <div className="mx_CommunityPrototypeInviteDialog_personIdentifiers">
-                    <span className="mx_CommunityPrototypeInviteDialog_personName">{person.user.name}</span>
-                    <span className="mx_CommunityPrototypeInviteDialog_personId">{person.userId}</span>
+                    <span className="mx_CommunityPrototypeInviteDialog_personName">{ person.user.name }</span>
+                    <span className="mx_CommunityPrototypeInviteDialog_personId">{ person.userId }</span>
                 </div>
                 <StyledCheckbox onChange={(e) => this.setPersonToggle(person, e.target.checked)} />
             </div>
@@ -187,7 +187,7 @@ export default class CommunityPrototypeInviteDialog extends React.PureComponent<
         emailAddresses.push((
             <Field
                 key={emailAddresses.length}
-                value={""}
+                value=""
                 onChange={(e) => this.onAddressChange(e, emailAddresses.length)}
                 label={emailAddresses.length > 0 ? _t("Add another email") : _t("Email address")}
                 placeholder={emailAddresses.length > 0 ? _t("Add another email") : _t("Email address")}
@@ -205,18 +205,21 @@ export default class CommunityPrototypeInviteDialog extends React.PureComponent<
                 people.push((
                     <AccessibleButton
                         onClick={this.onShowMorePeople}
-                        kind="link" key="more"
+                        kind="link"
+                        key="more"
                         className="mx_CommunityPrototypeInviteDialog_morePeople"
-                    >{_t("Show more")}</AccessibleButton>
+                    >
+                        { _t("Show more") }
+                    </AccessibleButton>
                 ));
             }
         }
         if (this.state.people.length > 0) {
             peopleIntro = (
                 <div className="mx_CommunityPrototypeInviteDialog_people">
-                    <span>{_t("People you know on %(brand)s", { brand: SdkConfig.get().brand })}</span>
+                    <span>{ _t("People you know on %(brand)s", { brand: SdkConfig.get().brand }) }</span>
                     <AccessibleButton onClick={this.onShowPeopleClick}>
-                        {this.state.showPeople ? _t("Hide") : _t("Show")}
+                        { this.state.showPeople ? _t("Hide") : _t("Show") }
                     </AccessibleButton>
                 </div>
             );
@@ -236,14 +239,17 @@ export default class CommunityPrototypeInviteDialog extends React.PureComponent<
             >
                 <form onSubmit={this.onSubmit}>
                     <div className="mx_Dialog_content">
-                        {emailAddresses}
-                        {peopleIntro}
-                        {people}
+                        { emailAddresses }
+                        { peopleIntro }
+                        { people }
                         <AccessibleButton
-                            kind="primary" onClick={this.onSubmit}
+                            kind="primary"
+                            onClick={this.onSubmit}
                             disabled={this.state.busy}
                             className="mx_CommunityPrototypeInviteDialog_primaryButton"
-                        >{buttonText}</AccessibleButton>
+                        >
+                            { buttonText }
+                        </AccessibleButton>
                     </div>
                 </form>
             </BaseDialog>

src/components/views/dialogs/ConfirmRedactDialog.tsx

@@ -37,8 +37,8 @@ export default class ConfirmRedactDialog extends React.Component<IProps> {
                        "Note that if you delete a room name or topic change, it could undo the change.")}
                 placeholder={_t("Reason (optional)")}
                 focus
-                button={_t("Remove")}>
-            </TextInputDialog>
+                button={_t("Remove")}
+            />
         );
     }
 }

src/components/views/dialogs/ConfirmUserActionDialog.tsx

@@ -104,7 +104,9 @@ export default class ConfirmUserActionDialog extends React.Component<IProps> {
         }
 
         return (
-            <BaseDialog className="mx_ConfirmUserActionDialog" onFinished={this.props.onFinished}
+            <BaseDialog
+                className="mx_ConfirmUserActionDialog"
+                onFinished={this.props.onFinished}
                 title={this.props.title}
                 contentId='mx_Dialog_content'
             >

src/components/views/dialogs/ConfirmWipeDeviceDialog.tsx

@@ -44,10 +44,10 @@ export default class ConfirmWipeDeviceDialog extends React.Component<IProps> {
             >
                 <div className='mx_ConfirmWipeDeviceDialog_content'>
                     <p>
-                        {_t(
+                        { _t(
                             "Clearing all data from this session is permanent. Encrypted messages will be lost " +
                             "unless their keys have been backed up.",
-                        )}
+                        ) }
                     </p>
                 </div>
                 <DialogButtons

src/components/views/dialogs/CreateCommunityPrototypeDialog.tsx

@@ -144,11 +144,11 @@ export default class CreateCommunityPrototypeDialog extends React.PureComponent<
         if (this.state.localpart) {
             communityId = (
                 <span className="mx_CreateCommunityPrototypeDialog_communityId">
-                    {_t("Community ID: +<localpart />:%(domain)s", {
+                    { _t("Community ID: +<localpart />:%(domain)s", {
                         domain: MatrixClientPeg.getHomeserverName(),
                     }, {
-                        localpart: () => <u>{this.state.localpart}</u>,
-                    })}
+                        localpart: () => <u>{ this.state.localpart }</u>,
+                    }) }
                     <InfoTooltip
                         tooltip={_t(
                             "Use this when referencing your community to others. The community ID " +
@@ -161,14 +161,14 @@ export default class CreateCommunityPrototypeDialog extends React.PureComponent<
 
         let helpText = (
             <span className="mx_CreateCommunityPrototypeDialog_subtext">
-                {_t("You can change this later if needed.")}
+                { _t("You can change this later if needed.") }
             </span>
         );
         if (this.state.error) {
             const classes = "mx_CreateCommunityPrototypeDialog_subtext mx_CreateCommunityPrototypeDialog_subtext_error";
             helpText = (
                 <span className={classes}>
-                    {this.state.error}
+                    { this.state.error }
                 </span>
             );
         }
@@ -193,31 +193,33 @@ export default class CreateCommunityPrototypeDialog extends React.PureComponent<
                                 placeholder={_t("Enter name")}
                                 label={_t("Enter name")}
                             />
-                            {helpText}
+                            { helpText }
                             <span className="mx_CreateCommunityPrototypeDialog_subtext">
-                                {/*nbsp is to reserve the height of this element when there's nothing*/}
-                                &nbsp;{communityId}
+                                { /*nbsp is to reserve the height of this element when there's nothing*/ }
+                                &nbsp;{ communityId }
                             </span>
                             <AccessibleButton kind="primary" onClick={this.onSubmit} disabled={this.state.busy}>
-                                {_t("Create")}
+                                { _t("Create") }
                             </AccessibleButton>
                         </div>
                         <div className="mx_CreateCommunityPrototypeDialog_colAvatar">
                             <input
-                                type="file" style={{ display: "none" }}
-                                ref={this.avatarUploadRef} accept="image/*"
+                                type="file"
+                                style={{ display: "none" }}
+                                ref={this.avatarUploadRef}
+                                accept="image/*"
                                 onChange={this.onAvatarChanged}
                             />
                             <AccessibleButton
                                 onClick={this.onChangeAvatar}
                                 className="mx_CreateCommunityPrototypeDialog_avatarContainer"
                             >
-                                {preview}
+                                { preview }
                             </AccessibleButton>
                             <div className="mx_CreateCommunityPrototypeDialog_tip">
-                                <b>{_t("Add image (optional)")}</b>
+                                <b>{ _t("Add image (optional)") }</b>
                                 <span>
-                                    {_t("An image will help people identify your community.")}
+                                    { _t("An image will help people identify your community.") }
                                 </span>
                             </div>
                         </div>

src/components/views/dialogs/CreateGroupDialog.tsx

@@ -102,7 +102,7 @@ export default class CreateGroupDialog extends React.Component<IProps, IState> {
         });
     };
 
-    _onCancel = () => {
+    private onCancel = () => {
         this.props.onFinished(false);
     };
 
@@ -123,7 +123,9 @@ export default class CreateGroupDialog extends React.Component<IProps, IState> {
         }
 
         return (
-            <BaseDialog className="mx_CreateGroupDialog" onFinished={this.props.onFinished}
+            <BaseDialog
+                className="mx_CreateGroupDialog"
+                onFinished={this.props.onFinished}
                 title={_t('Create Community')}
             >
                 <form onSubmit={this.onFormSubmit}>
@@ -133,8 +135,11 @@ export default class CreateGroupDialog extends React.Component<IProps, IState> {
                                 <label htmlFor="groupname">{ _t('Community Name') }</label>
                             </div>
                             <div>
-                                <input id="groupname" className="mx_CreateGroupDialog_input"
-                                    autoFocus={true} size={64}
+                                <input
+                                    id="groupname"
+                                    className="mx_CreateGroupDialog_input"
+                                    autoFocus={true}
+                                    size={64}
                                     placeholder={_t('Example')}
                                     onChange={this.onGroupNameChange}
                                     value={this.state.groupName}
@@ -167,7 +172,7 @@ export default class CreateGroupDialog extends React.Component<IProps, IState> {
                     </div>
                     <div className="mx_Dialog_buttons">
                         <input type="submit" value={_t('Create')} className="mx_Dialog_primary" />
-                        <button onClick={this._onCancel}>
+                        <button onClick={this.onCancel}>
                             { _t("Cancel") }
                         </button>
                     </div>

src/components/views/dialogs/CreateRoomDialog.tsx

@@ -17,6 +17,7 @@ limitations under the License.
 
 import React, { ChangeEvent, createRef, KeyboardEvent, SyntheticEvent } from "react";
 import { Room } from "matrix-js-sdk/src/models/room";
+import { JoinRule, Preset, Visibility } from "matrix-js-sdk/src/@types/partials";
 
 import SdkConfig from '../../../SdkConfig';
 import withValidation, { IFieldState } from '../elements/Validation';
@@ -31,7 +32,8 @@ import RoomAliasField from "../elements/RoomAliasField";
 import LabelledToggleSwitch from "../elements/LabelledToggleSwitch";
 import DialogButtons from "../elements/DialogButtons";
 import BaseDialog from "../dialogs/BaseDialog";
-import { Preset, Visibility } from "matrix-js-sdk/src/@types/partials";
+import SpaceStore from "../../../stores/SpaceStore";
+import JoinRuleDropdown from "../elements/JoinRuleDropdown";
 
 interface IProps {
     defaultPublic?: boolean;
@@ -41,7 +43,7 @@ interface IProps {
 }
 
 interface IState {
-    isPublic: boolean;
+    joinRule: JoinRule;
     isEncrypted: boolean;
     name: string;
     topic: string;
@@ -54,15 +56,25 @@ interface IState {
 
 @replaceableComponent("views.dialogs.CreateRoomDialog")
 export default class CreateRoomDialog extends React.Component<IProps, IState> {
+    private readonly supportsRestricted: boolean;
     private nameField = createRef<Field>();
     private aliasField = createRef<RoomAliasField>();
 
     constructor(props) {
         super(props);
 
+        this.supportsRestricted = this.props.parentSpace && !!SpaceStore.instance.restrictedJoinRuleSupport?.preferred;
+
+        let joinRule = JoinRule.Invite;
+        if (this.props.defaultPublic) {
+            joinRule = JoinRule.Public;
+        } else if (this.supportsRestricted) {
+            joinRule = JoinRule.Restricted;
+        }
+
         const config = SdkConfig.get();
         this.state = {
-            isPublic: this.props.defaultPublic || false,
+            joinRule,
             isEncrypted: privateShouldBeEncrypted(),
             name: this.props.defaultName || "",
             topic: "",
@@ -81,13 +93,18 @@ export default class CreateRoomDialog extends React.Component<IProps, IState> {
         const opts: IOpts = {};
         const createOpts: IOpts["createOpts"] = opts.createOpts = {};
         createOpts.name = this.state.name;
-        if (this.state.isPublic) {
+
+        if (this.state.joinRule === JoinRule.Public) {
             createOpts.visibility = Visibility.Public;
             createOpts.preset = Preset.PublicChat;
             opts.guestAccess = false;
             const { alias } = this.state;
             createOpts.room_alias_name = alias.substr(1, alias.indexOf(":") - 1);
+        } else {
+            // If we cannot change encryption we pass `true` for safety, the server should automatically do this for us.
+            opts.encryption = this.state.canChangeEncryption ? this.state.isEncrypted : true;
         }
+
         if (this.state.topic) {
             createOpts.topic = this.state.topic;
         }
@@ -95,22 +112,13 @@ export default class CreateRoomDialog extends React.Component<IProps, IState> {
             createOpts.creation_content = { 'm.federate': false };
         }
 
-        if (!this.state.isPublic) {
-            if (this.state.canChangeEncryption) {
-                opts.encryption = this.state.isEncrypted;
-            } else {
-                // the server should automatically do this for us, but for safety
-                // we'll demand it too.
-                opts.encryption = true;
-            }
-        }
-
         if (CommunityPrototypeStore.instance.getSelectedCommunityId()) {
             opts.associatedWithCommunity = CommunityPrototypeStore.instance.getSelectedCommunityId();
         }
 
-        if (this.props.parentSpace) {
-            opts.parentSpace = this.props.parentSpace;
+        opts.parentSpace = this.props.parentSpace;
+        if (this.props.parentSpace && this.state.joinRule === JoinRule.Restricted) {
+            opts.joinRule = JoinRule.Restricted;
         }
 
         return opts;
@@ -172,8 +180,8 @@ export default class CreateRoomDialog extends React.Component<IProps, IState> {
         this.setState({ topic: ev.target.value });
     };
 
-    private onPublicChange = (isPublic: boolean) => {
-        this.setState({ isPublic });
+    private onJoinRuleChange = (joinRule: JoinRule) => {
+        this.setState({ joinRule });
     };
 
     private onEncryptedChange = (isEncrypted: boolean) => {
@@ -210,7 +218,7 @@ export default class CreateRoomDialog extends React.Component<IProps, IState> {
 
     render() {
         let aliasField;
-        if (this.state.isPublic) {
+        if (this.state.joinRule === JoinRule.Public) {
             const domain = MatrixClientPeg.get().getDomain();
             aliasField = (
                 <div className="mx_CreateRoomDialog_aliasContainer">
@@ -224,19 +232,52 @@ export default class CreateRoomDialog extends React.Component<IProps, IState> {
             );
         }
 
-        let publicPrivateLabel = <p>{_t(
-            "Private rooms can be found and joined by invitation only. Public rooms can be " +
-            "found and joined by anyone.",
-        )}</p>;
+        let publicPrivateLabel: JSX.Element;
         if (CommunityPrototypeStore.instance.getSelectedCommunityId()) {
-            publicPrivateLabel = <p>{_t(
-                "Private rooms can be found and joined by invitation only. Public rooms can be " +
-                "found and joined by anyone in this community.",
-            )}</p>;
+            publicPrivateLabel = <p>
+                { _t(
+                    "Private rooms can be found and joined by invitation only. Public rooms can be " +
+                    "found and joined by anyone in this community.",
+                ) }
+            </p>;
+        } else if (this.state.joinRule === JoinRule.Restricted) {
+            publicPrivateLabel = <p>
+                { _t(
+                    "Everyone in <SpaceName/> will be able to find and join this room.", {}, {
+                        SpaceName: () => <b>{ this.props.parentSpace.name }</b>,
+                    },
+                ) }
+                &nbsp;
+                { _t("You can change this at any time from room settings.") }
+            </p>;
+        } else if (this.state.joinRule === JoinRule.Public && this.props.parentSpace) {
+            publicPrivateLabel = <p>
+                { _t(
+                    "Anyone will be able to find and join this room, not just members of <SpaceName/>.", {}, {
+                        SpaceName: () => <b>{ this.props.parentSpace.name }</b>,
+                    },
+                ) }
+                &nbsp;
+                { _t("You can change this at any time from room settings.") }
+            </p>;
+        } else if (this.state.joinRule === JoinRule.Public) {
+            publicPrivateLabel = <p>
+                { _t("Anyone will be able to find and join this room.") }
+                &nbsp;
+                { _t("You can change this at any time from room settings.") }
+            </p>;
+        } else if (this.state.joinRule === JoinRule.Invite) {
+            publicPrivateLabel = <p>
+                { _t(
+                    "Only people invited will be able to find and join this room.",
+                ) }
+                &nbsp;
+                { _t("You can change this at any time from room settings.") }
+            </p>;
         }
 
         let e2eeSection;
-        if (!this.state.isPublic) {
+        if (this.state.joinRule !== JoinRule.Public) {
             let microcopy;
             if (privateShouldBeEncrypted()) {
                 if (this.state.canChangeEncryption) {
@@ -250,7 +291,7 @@ export default class CreateRoomDialog extends React.Component<IProps, IState> {
             }
             e2eeSection = <React.Fragment>
                 <LabelledToggleSwitch
-                    label={ _t("Enable end-to-end encryption")}
+                    label={_t("Enable end-to-end encryption")}
                     onChange={this.onEncryptedChange}
                     value={this.state.isEncrypted}
                     className='mx_CreateRoomDialog_e2eSwitch' // for end-to-end tests
@@ -273,15 +314,16 @@ export default class CreateRoomDialog extends React.Component<IProps, IState> {
             );
         }
 
-        let title = this.state.isPublic ? _t('Create a public room') : _t('Create a private room');
+        let title = _t("Create a room");
         if (CommunityPrototypeStore.instance.getSelectedCommunityId()) {
             const name = CommunityPrototypeStore.instance.getSelectedCommunityName();
             title = _t("Create a room in %(communityName)s", { communityName: name });
+        } else if (!this.props.parentSpace) {
+            title = this.state.joinRule === JoinRule.Public ? _t('Create a public room') : _t('Create a private room');
         }
+
         return (
-            <BaseDialog className="mx_CreateRoomDialog" onFinished={this.props.onFinished}
-                title={title}
-            >
+            <BaseDialog className="mx_CreateRoomDialog" onFinished={this.props.onFinished} title={title}>
                 <form onSubmit={this.onOk} onKeyDown={this.onKeyDown}>
                     <div className="mx_Dialog_content">
                         <Field
@@ -298,11 +340,16 @@ export default class CreateRoomDialog extends React.Component<IProps, IState> {
                             value={this.state.topic}
                             className="mx_CreateRoomDialog_topic"
                         />
-                        <LabelledToggleSwitch
-                            label={_t("Make this room public")}
-                            onChange={this.onPublicChange}
-                            value={this.state.isPublic}
+
+                        <JoinRuleDropdown
+                            label={_t("Room visibility")}
+                            labelInvite={_t("Private room (invite only)")}
+                            labelPublic={_t("Public room")}
+                            labelRestricted={this.supportsRestricted ? _t("Visible to space members") : undefined}
+                            value={this.state.joinRule}
+                            onChange={this.onJoinRuleChange}
                         />
+
                         { publicPrivateLabel }
                         { e2eeSection }
                         { aliasField }
@@ -318,7 +365,7 @@ export default class CreateRoomDialog extends React.Component<IProps, IState> {
                                 onChange={this.onNoFederateChange}
                                 value={this.state.noFederate}
                             />
-                            <p>{federateLabel}</p>
+                            <p>{ federateLabel }</p>
                         </details>
                     </div>
                 </form>

src/components/views/dialogs/CreateSubspaceDialog.tsx

@@ -0,0 +1,210 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React, { useRef, useState } from "react";
+import { Room } from "matrix-js-sdk/src/models/room";
+import { JoinRule, Preset } from "matrix-js-sdk/src/@types/partials";
+import { RoomType } from "matrix-js-sdk/src/@types/event";
+
+import { _t } from '../../../languageHandler';
+import BaseDialog from "./BaseDialog";
+import AccessibleButton from "../elements/AccessibleButton";
+import MatrixClientContext from "../../../contexts/MatrixClientContext";
+import { BetaPill } from "../beta/BetaCard";
+import Field from "../elements/Field";
+import RoomAliasField from "../elements/RoomAliasField";
+import SpaceStore from "../../../stores/SpaceStore";
+import { SpaceCreateForm } from "../spaces/SpaceCreateMenu";
+import createRoom from "../../../createRoom";
+import { SubspaceSelector } from "./AddExistingToSpaceDialog";
+import JoinRuleDropdown from "../elements/JoinRuleDropdown";
+
+interface IProps {
+    space: Room;
+    onAddExistingSpaceClick(): void;
+    onFinished(added?: boolean): void;
+}
+
+const CreateSubspaceDialog: React.FC<IProps> = ({ space, onAddExistingSpaceClick, onFinished }) => {
+    const [parentSpace, setParentSpace] = useState(space);
+
+    const [busy, setBusy] = useState<boolean>(false);
+    const [name, setName] = useState("");
+    const spaceNameField = useRef<Field>();
+    const [alias, setAlias] = useState("");
+    const spaceAliasField = useRef<RoomAliasField>();
+    const [avatar, setAvatar] = useState<File>(null);
+    const [topic, setTopic] = useState<string>("");
+
+    const supportsRestricted = !!SpaceStore.instance.restrictedJoinRuleSupport?.preferred;
+
+    const spaceJoinRule = space.getJoinRule();
+    let defaultJoinRule = JoinRule.Invite;
+    if (spaceJoinRule === JoinRule.Public) {
+        defaultJoinRule = JoinRule.Public;
+    } else if (supportsRestricted) {
+        defaultJoinRule = JoinRule.Restricted;
+    }
+    const [joinRule, setJoinRule] = useState<JoinRule>(defaultJoinRule);
+
+    const onCreateSubspaceClick = async (e) => {
+        e.preventDefault();
+        if (busy) return;
+
+        setBusy(true);
+        // require & validate the space name field
+        if (!await spaceNameField.current.validate({ allowEmpty: false })) {
+            spaceNameField.current.focus();
+            spaceNameField.current.validate({ allowEmpty: false, focused: true });
+            setBusy(false);
+            return;
+        }
+        // validate the space name alias field but do not require it
+        if (joinRule === JoinRule.Public && !await spaceAliasField.current.validate({ allowEmpty: true })) {
+            spaceAliasField.current.focus();
+            spaceAliasField.current.validate({ allowEmpty: true, focused: true });
+            setBusy(false);
+            return;
+        }
+
+        try {
+            await createRoom({
+                createOpts: {
+                    preset: joinRule === JoinRule.Public ? Preset.PublicChat : Preset.PrivateChat,
+                    name,
+                    power_level_content_override: {
+                        // Only allow Admins to write to the timeline to prevent hidden sync spam
+                        events_default: 100,
+                        ...joinRule === JoinRule.Public ? { invite: 0 } : {},
+                    },
+                    room_alias_name: joinRule === JoinRule.Public && alias
+                        ? alias.substr(1, alias.indexOf(":") - 1)
+                        : undefined,
+                    topic,
+                },
+                avatar,
+                roomType: RoomType.Space,
+                parentSpace,
+                spinner: false,
+                encryption: false,
+                andView: true,
+                inlineErrors: true,
+            });
+
+            onFinished(true);
+        } catch (e) {
+            console.error(e);
+        }
+    };
+
+    let joinRuleMicrocopy: JSX.Element;
+    if (joinRule === JoinRule.Restricted) {
+        joinRuleMicrocopy = <p>
+            { _t(
+                "Anyone in <SpaceName/> will be able to find and join.", {}, {
+                    SpaceName: () => <b>{ parentSpace.name }</b>,
+                },
+            ) }
+        </p>;
+    } else if (joinRule === JoinRule.Public) {
+        joinRuleMicrocopy = <p>
+            { _t(
+                "Anyone will be able to find and join this space, not just members of <SpaceName/>.", {}, {
+                    SpaceName: () => <b>{ parentSpace.name }</b>,
+                },
+            ) }
+        </p>;
+    } else if (joinRule === JoinRule.Invite) {
+        joinRuleMicrocopy = <p>
+            { _t("Only people invited will be able to find and join this space.") }
+        </p>;
+    }
+
+    return <BaseDialog
+        title={(
+            <SubspaceSelector
+                title={_t("Create a space")}
+                space={space}
+                value={parentSpace}
+                onChange={setParentSpace}
+            />
+        )}
+        className="mx_CreateSubspaceDialog"
+        contentId="mx_CreateSubspaceDialog"
+        onFinished={onFinished}
+        fixedWidth={false}
+    >
+        <MatrixClientContext.Provider value={space.client}>
+            <div className="mx_CreateSubspaceDialog_content">
+                <div className="mx_CreateSubspaceDialog_betaNotice">
+                    <BetaPill />
+                    { _t("Add a space to a space you manage.") }
+                </div>
+
+                <SpaceCreateForm
+                    busy={busy}
+                    onSubmit={onCreateSubspaceClick}
+                    setAvatar={setAvatar}
+                    name={name}
+                    setName={setName}
+                    nameFieldRef={spaceNameField}
+                    topic={topic}
+                    setTopic={setTopic}
+                    alias={alias}
+                    setAlias={setAlias}
+                    showAliasField={joinRule === JoinRule.Public}
+                    aliasFieldRef={spaceAliasField}
+                >
+                    <JoinRuleDropdown
+                        label={_t("Space visibility")}
+                        labelInvite={_t("Private space (invite only)")}
+                        labelPublic={_t("Public space")}
+                        labelRestricted={supportsRestricted ? _t("Visible to space members") : undefined}
+                        width={478}
+                        value={joinRule}
+                        onChange={setJoinRule}
+                    />
+                    { joinRuleMicrocopy }
+                </SpaceCreateForm>
+            </div>
+
+            <div className="mx_CreateSubspaceDialog_footer">
+                <div className="mx_CreateSubspaceDialog_footer_prompt">
+                    <div>{ _t("Want to add an existing space instead?") }</div>
+                    <AccessibleButton
+                        kind="link"
+                        onClick={() => {
+                            onAddExistingSpaceClick();
+                            onFinished();
+                        }}
+                    >
+                        { _t("Add existing space") }
+                    </AccessibleButton>
+                </div>
+
+                <AccessibleButton kind="primary_outline" disabled={busy} onClick={() => onFinished(false)}>
+                    { _t("Cancel") }
+                </AccessibleButton>
+                <AccessibleButton kind="primary" disabled={busy} onClick={onCreateSubspaceClick}>
+                    { busy ? _t("Adding...") : _t("Add") }
+                </AccessibleButton>
+            </div>
+        </MatrixClientContext.Provider>
+    </BaseDialog>;
+};
+
+export default CreateSubspaceDialog;
+

src/components/views/dialogs/CryptoStoreTooNewDialog.tsx

@@ -72,7 +72,7 @@ const CryptoStoreTooNewDialog: React.FC<IProps> = (props: IProps) => {
             hasCancel={false}
             onPrimaryButtonClick={props.onFinished}
         >
-            <button onClick={_onLogoutClicked} >
+            <button onClick={_onLogoutClicked}>
                 { _t('Sign out') }
             </button>
         </DialogButtons>

src/components/views/dialogs/DeactivateAccountDialog.tsx

@@ -172,11 +172,11 @@ export default class DeactivateAccountDialog extends React.Component<IProps, ISt
             </div>;
         }
 
-        let auth = <div>{_t("Loading...")}</div>;
+        let auth = <div>{ _t("Loading...") }</div>;
         if (this.state.authData && this.state.authEnabled) {
             auth = (
                 <div>
-                    {this.state.bodyText}
+                    { this.state.bodyText }
                     <InteractiveAuth
                         matrixClient={MatrixClientPeg.get()}
                         authData={this.state.authData}
@@ -230,18 +230,18 @@ export default class DeactivateAccountDialog extends React.Component<IProps, ISt
                                 checked={this.state.shouldErase}
                                 onChange={this.onEraseFieldChange}
                             >
-                                {_t(
+                                { _t(
                                     "Please forget all messages I have sent when my account is deactivated " +
                                     "(<b>Warning:</b> this will cause future users to see an incomplete view " +
                                     "of conversations)",
                                     {},
                                     { b: (sub) => <b>{ sub }</b> },
-                                )}
+                                ) }
                             </StyledCheckbox>
                         </p>
 
-                        {error}
-                        {auth}
+                        { error }
+                        { auth }
                     </div>
 
                 </div>

src/components/views/dialogs/DevtoolsDialog.tsx

@@ -182,14 +182,23 @@ export class SendCustomEvent extends GenericEditor<ISendCustomEventProps, ISendC
 
                 <br />
 
-                <Field id="evContent" label={_t("Event Content")} type="text" className="mx_DevTools_textarea"
-                    autoComplete="off" value={this.state.evContent} onChange={this.onChange} element="textarea" />
+                <Field
+                    id="evContent"
+                    label={_t("Event Content")}
+                    type="text"
+                    className="mx_DevTools_textarea"
+                    autoComplete="off"
+                    value={this.state.evContent}
+                    onChange={this.onChange}
+                    element="textarea" />
             </div>
             <div className="mx_Dialog_buttons">
                 <button onClick={this.onBack}>{ _t('Back') }</button>
                 { !this.state.message && <button onClick={this.send}>{ _t('Send') }</button> }
                 { showTglFlip && <div style={{ float: "right" }}>
-                    <input id="isStateEvent" className="mx_DevTools_tgl mx_DevTools_tgl-flip"
+                    <input
+                        id="isStateEvent"
+                        className="mx_DevTools_tgl mx_DevTools_tgl-flip"
                         type="checkbox"
                         checked={this.state.isStateEvent}
                         onChange={this.onChange}
@@ -282,14 +291,24 @@ class SendAccountData extends GenericEditor<ISendAccountDataProps, ISendAccountD
                 { this.textInput('eventType', _t('Event Type')) }
                 <br />
 
-                <Field id="evContent" label={_t("Event Content")} type="text" className="mx_DevTools_textarea"
-                    autoComplete="off" value={this.state.evContent} onChange={this.onChange} element="textarea" />
+                <Field
+                    id="evContent"
+                    label={_t("Event Content")}
+                    type="text"
+                    className="mx_DevTools_textarea"
+                    autoComplete="off"
+                    value={this.state.evContent}
+                    onChange={this.onChange}
+                    element="textarea"
+                />
             </div>
             <div className="mx_Dialog_buttons">
                 <button onClick={this.onBack}>{ _t('Back') }</button>
                 { !this.state.message && <button onClick={this.send}>{ _t('Send') }</button> }
                 { !this.state.message && <div style={{ float: "right" }}>
-                    <input id="isRoomAccountData" className="mx_DevTools_tgl mx_DevTools_tgl-flip"
+                    <input
+                        id="isRoomAccountData"
+                        className="mx_DevTools_tgl mx_DevTools_tgl-flip"
                         type="checkbox"
                         checked={this.state.isRoomAccountData}
                         disabled={this.props.forceMode}
@@ -337,7 +356,7 @@ class FilteredList extends React.PureComponent<IFilteredListProps, IFilteredList
     }
 
     // TODO: [REACT-WARNING] Replace with appropriate lifecycle event
-    UNSAFE_componentWillReceiveProps(nextProps) { // eslint-disable-line camelcase
+    UNSAFE_componentWillReceiveProps(nextProps) { // eslint-disable-line
         if (this.props.children === nextProps.children && this.props.query === nextProps.query) return;
         this.setState({
             filteredChildren: FilteredList.filterChildren(nextProps.children, nextProps.query),
@@ -371,11 +390,18 @@ class FilteredList extends React.PureComponent<IFilteredListProps, IFilteredList
 
     render() {
         return <div>
-            <Field label={_t('Filter results')} autoFocus={true} size={64}
-                type="text" autoComplete="off" value={this.props.query} onChange={this.onQuery}
+            <Field
+                label={_t('Filter results')}
+                autoFocus={true}
+                size={64}
+                type="text"
+                autoComplete="off"
+                value={this.props.query}
+                onChange={this.onQuery}
                 className="mx_TextInputDialog_input mx_DevTools_RoomStateExplorer_query"
                 // force re-render so that autoFocus is applied when this component is re-used
-                key={this.props.children[0] ? this.props.children[0].key : ''} />
+                key={this.props.children[0] ? this.props.children[0].key : ''}
+            />
 
             <TruncatedList getChildren={this.getChildren}
                 getChildCount={this.getChildCount}
@@ -459,11 +485,16 @@ class RoomStateExplorer extends React.PureComponent<IExplorerProps, IRoomStateEx
     render() {
         if (this.state.event) {
             if (this.state.editing) {
-                return <SendCustomEvent room={this.props.room} forceStateEvent={true} onBack={this.onBack} inputs={{
-                    eventType: this.state.event.getType(),
-                    evContent: JSON.stringify(this.state.event.getContent(), null, '\t'),
-                    stateKey: this.state.event.getStateKey(),
-                }} />;
+                return <SendCustomEvent
+                    room={this.props.room}
+                    forceStateEvent={true}
+                    onBack={this.onBack}
+                    inputs={{
+                        eventType: this.state.event.getType(),
+                        evContent: JSON.stringify(this.state.event.getContent(), null, '\t'),
+                        stateKey: this.state.event.getStateKey(),
+                    }}
+                />;
             }
 
             return <div className="mx_ViewSource">
@@ -494,7 +525,7 @@ class RoomStateExplorer extends React.PureComponent<IExplorerProps, IRoomStateEx
                         }
 
                         return <button className={classes} key={eventType} onClick={onClickFn}>
-                            {eventType}
+                            { eventType }
                         </button>;
                     })
                 }
@@ -594,7 +625,9 @@ class AccountDataExplorer extends React.PureComponent<IExplorerProps, IAccountDa
                     inputs={{
                         eventType: this.state.event.getType(),
                         evContent: JSON.stringify(this.state.event.getContent(), null, '\t'),
-                    }} forceMode={true} />;
+                    }}
+                    forceMode={true}
+                />;
             }
 
             return <div className="mx_ViewSource">
@@ -631,7 +664,9 @@ class AccountDataExplorer extends React.PureComponent<IExplorerProps, IAccountDa
             <div className="mx_Dialog_buttons">
                 <button onClick={this.onBack}>{ _t('Back') }</button>
                 <div style={{ float: "right" }}>
-                    <input id="isRoomAccountData" className="mx_DevTools_tgl mx_DevTools_tgl-flip"
+                    <input
+                        id="isRoomAccountData"
+                        className="mx_DevTools_tgl mx_DevTools_tgl-flip"
                         type="checkbox"
                         checked={this.state.isRoomAccountData}
                         onChange={this.onChange}
@@ -726,17 +761,17 @@ const VerificationRequestExplorer: React.FC<{
     return (<div className="mx_DevTools_VerificationRequest">
         <dl>
             <dt>Transaction</dt>
-            <dd>{txnId}</dd>
+            <dd>{ txnId }</dd>
             <dt>Phase</dt>
-            <dd>{PHASE_MAP[request.phase] || request.phase}</dd>
+            <dd>{ PHASE_MAP[request.phase] || request.phase }</dd>
             <dt>Timeout</dt>
-            <dd>{Math.floor(timeout / 1000)}</dd>
+            <dd>{ Math.floor(timeout / 1000) }</dd>
             <dt>Methods</dt>
-            <dd>{request.methods && request.methods.join(", ")}</dd>
+            <dd>{ request.methods && request.methods.join(", ") }</dd>
             <dt>requestingUserId</dt>
-            <dd>{request.requestingUserId}</dd>
+            <dd>{ request.requestingUserId }</dd>
             <dt>observeOnly</dt>
-            <dd>{JSON.stringify(request.observeOnly)}</dd>
+            <dd>{ JSON.stringify(request.observeOnly) }</dd>
         </dl>
     </div>);
 };
@@ -771,12 +806,12 @@ class VerificationExplorer extends React.PureComponent<IExplorerProps> {
 
         return (<div>
             <div className="mx_Dialog_content">
-                {Array.from(inRoomRequests.entries()).reverse().map(([txnId, request]) =>
+                { Array.from(inRoomRequests.entries()).reverse().map(([txnId, request]) =>
                     <VerificationRequestExplorer txnId={txnId} request={request} key={txnId} />,
-                )}
+                ) }
             </div>
             <div className="mx_Dialog_buttons">
-                <button onClick={this.props.onBack}>{_t("Back")}</button>
+                <button onClick={this.props.onBack}>{ _t("Back") }</button>
             </div>
         </div>);
     }
@@ -844,9 +879,9 @@ class WidgetExplorer extends React.Component<IExplorerProps, IWidgetExplorerStat
             const stateEv = allState.find(ev => ev.getId() === editWidget.eventId);
             if (!stateEv) { // "should never happen"
                 return <div>
-                    {_t("There was an error finding this widget.")}
+                    { _t("There was an error finding this widget.") }
                     <div className="mx_Dialog_buttons">
-                        <button onClick={this.onBack}>{_t("Back")}</button>
+                        <button onClick={this.onBack}>{ _t("Back") }</button>
                     </div>
                 </div>;
             }
@@ -865,17 +900,17 @@ class WidgetExplorer extends React.Component<IExplorerProps, IWidgetExplorerStat
         return (<div>
             <div className="mx_Dialog_content">
                 <FilteredList query={this.state.query} onChange={this.onQueryChange}>
-                    {widgets.map(w => {
+                    { widgets.map(w => {
                         return <button
                             className='mx_DevTools_RoomStateExplorer_button'
                             key={w.url + w.eventId}
                             onClick={() => this.onEditWidget(w)}
-                        >{w.url}</button>;
-                    })}
+                        >{ w.url }</button>;
+                    }) }
                 </FilteredList>
             </div>
             <div className="mx_Dialog_buttons">
-                <button onClick={this.onBack}>{_t("Back")}</button>
+                <button onClick={this.onBack}>{ _t("Back") }</button>
             </div>
         </div>);
     }
@@ -1007,7 +1042,7 @@ class SettingsExplorer extends React.PureComponent<IExplorerProps, ISettingsExpl
     private renderCanEditLevel(roomId: string, level: SettingLevel): React.ReactNode {
         const canEdit = SettingsStore.canSetValue(this.state.editSetting, roomId, level);
         const className = canEdit ? 'mx_DevTools_SettingsExplorer_mutable' : 'mx_DevTools_SettingsExplorer_immutable';
-        return <td className={className}><code>{canEdit.toString()}</code></td>;
+        return <td className={className}><code>{ canEdit.toString() }</code></td>;
     }
 
     render() {
@@ -1021,46 +1056,53 @@ class SettingsExplorer extends React.PureComponent<IExplorerProps, ISettingsExpl
                 <div>
                     <div className="mx_Dialog_content mx_DevTools_SettingsExplorer">
                         <Field
-                            label={_t('Filter results')} autoFocus={true} size={64}
-                            type="text" autoComplete="off" value={this.state.query} onChange={this.onQueryChange}
+                            label={_t('Filter results')}
+                            autoFocus={true}
+                            size={64}
+                            type="text"
+                            autoComplete="off"
+                            value={this.state.query}
+                            onChange={this.onQueryChange}
                             className="mx_TextInputDialog_input mx_DevTools_RoomStateExplorer_query"
                         />
                         <table>
                             <thead>
                                 <tr>
-                                    <th>{_t("Setting ID")}</th>
-                                    <th>{_t("Value")}</th>
-                                    <th>{_t("Value in this room")}</th>
+                                    <th>{ _t("Setting ID") }</th>
+                                    <th>{ _t("Value") }</th>
+                                    <th>{ _t("Value in this room") }</th>
                                 </tr>
                             </thead>
                             <tbody>
-                                {allSettings.map(i => (
+                                { allSettings.map(i => (
                                     <tr key={i}>
                                         <td>
                                             <a href="" onClick={(e) => this.onViewClick(e, i)}>
-                                                <code>{i}</code>
+                                                <code>{ i }</code>
                                             </a>
-                                            <a href="" onClick={(e) => this.onEditClick(e, i)}
+                                            <a
+                                                href=""
+                                                onClick={(e) => this.onEditClick(e, i)}
                                                 className='mx_DevTools_SettingsExplorer_edit'
                                             >
                                             ✏
                                             </a>
                                         </td>
                                         <td>
-                                            <code>{this.renderSettingValue(SettingsStore.getValue(i))}</code>
+                                            <code>{ this.renderSettingValue(SettingsStore.getValue(i)) }</code>
                                         </td>
                                         <td>
                                             <code>
-                                                {this.renderSettingValue(SettingsStore.getValue(i, room.roomId))}
+                                                { this.renderSettingValue(SettingsStore.getValue(i, room.roomId)) }
                                             </code>
                                         </td>
                                     </tr>
-                                ))}
+                                )) }
                             </tbody>
                         </table>
                     </div>
                     <div className="mx_Dialog_buttons">
-                        <button onClick={this.onBack}>{_t("Back")}</button>
+                        <button onClick={this.onBack}>{ _t("Back") }</button>
                     </div>
                 </div>
             );
@@ -1068,62 +1110,70 @@ class SettingsExplorer extends React.PureComponent<IExplorerProps, ISettingsExpl
             return (
                 <div>
                     <div className="mx_Dialog_content mx_DevTools_SettingsExplorer">
-                        <h3>{_t("Setting:")} <code>{this.state.editSetting}</code></h3>
+                        <h3>{ _t("Setting:") } <code>{ this.state.editSetting }</code></h3>
 
                         <div className='mx_DevTools_SettingsExplorer_warning'>
-                            <b>{_t("Caution:")}</b> {_t(
+                            <b>{ _t("Caution:") }</b> { _t(
                                 "This UI does NOT check the types of the values. Use at your own risk.",
-                            )}
+                            ) }
                         </div>
 
                         <div>
-                            {_t("Setting definition:")}
-                            <pre><code>{JSON.stringify(SETTINGS[this.state.editSetting], null, 4)}</code></pre>
+                            { _t("Setting definition:") }
+                            <pre><code>{ JSON.stringify(SETTINGS[this.state.editSetting], null, 4) }</code></pre>
                         </div>
 
                         <div>
                             <table>
                                 <thead>
                                     <tr>
-                                        <th>{_t("Level")}</th>
-                                        <th>{_t("Settable at global")}</th>
-                                        <th>{_t("Settable at room")}</th>
+                                        <th>{ _t("Level") }</th>
+                                        <th>{ _t("Settable at global") }</th>
+                                        <th>{ _t("Settable at room") }</th>
                                     </tr>
                                 </thead>
                                 <tbody>
-                                    {LEVEL_ORDER.map(lvl => (
+                                    { LEVEL_ORDER.map(lvl => (
                                         <tr key={lvl}>
-                                            <td><code>{lvl}</code></td>
-                                            {this.renderCanEditLevel(null, lvl)}
-                                            {this.renderCanEditLevel(room.roomId, lvl)}
+                                            <td><code>{ lvl }</code></td>
+                                            { this.renderCanEditLevel(null, lvl) }
+                                            { this.renderCanEditLevel(room.roomId, lvl) }
                                         </tr>
-                                    ))}
+                                    )) }
                                 </tbody>
                             </table>
                         </div>
 
                         <div>
                             <Field
-                                id="valExpl" label={_t("Values at explicit levels")} type="text"
-                                className="mx_DevTools_textarea" element="textarea"
-                                autoComplete="off" value={this.state.explicitValues}
+                                id="valExpl"
+                                label={_t("Values at explicit levels")}
+                                type="text"
+                                className="mx_DevTools_textarea"
+                                element="textarea"
+                                autoComplete="off"
+                                value={this.state.explicitValues}
                                 onChange={this.onExplValuesEdit}
                             />
                         </div>
 
                         <div>
                             <Field
-                                id="valExpl" label={_t("Values at explicit levels in this room")} type="text"
-                                className="mx_DevTools_textarea" element="textarea"
-                                autoComplete="off" value={this.state.explicitRoomValues}
+                                id="valExpl"
+                                label={_t("Values at explicit levels in this room")}
+                                type="text"
+                                className="mx_DevTools_textarea"
+                                element="textarea"
+                                autoComplete="off"
+                                value={this.state.explicitRoomValues}
                                 onChange={this.onExplRoomValuesEdit}
                             />
                         </div>
 
                     </div>
                     <div className="mx_Dialog_buttons">
-                        <button onClick={this.onSaveClick}>{_t("Save setting values")}</button>
-                        <button onClick={this.onBack}>{_t("Back")}</button>
+                        <button onClick={this.onSaveClick}>{ _t("Save setting values") }</button>
+                        <button onClick={this.onBack}>{ _t("Back") }</button>
                     </div>
                 </div>
             );
@@ -1131,39 +1181,39 @@ class SettingsExplorer extends React.PureComponent<IExplorerProps, ISettingsExpl
             return (
                 <div>
                     <div className="mx_Dialog_content mx_DevTools_SettingsExplorer">
-                        <h3>{_t("Setting:")} <code>{this.state.viewSetting}</code></h3>
+                        <h3>{ _t("Setting:") } <code>{ this.state.viewSetting }</code></h3>
 
                         <div>
-                            {_t("Setting definition:")}
-                            <pre><code>{JSON.stringify(SETTINGS[this.state.viewSetting], null, 4)}</code></pre>
+                            { _t("Setting definition:") }
+                            <pre><code>{ JSON.stringify(SETTINGS[this.state.viewSetting], null, 4) }</code></pre>
                         </div>
 
                         <div>
-                            {_t("Value:")}&nbsp;
-                            <code>{this.renderSettingValue(
+                            { _t("Value:") }&nbsp;
+                            <code>{ this.renderSettingValue(
                                 SettingsStore.getValue(this.state.viewSetting),
-                            )}</code>
+                            ) }</code>
                         </div>
 
                         <div>
-                            {_t("Value in this room:")}&nbsp;
-                            <code>{this.renderSettingValue(
+                            { _t("Value in this room:") }&nbsp;
+                            <code>{ this.renderSettingValue(
                                 SettingsStore.getValue(this.state.viewSetting, room.roomId),
-                            )}</code>
+                            ) }</code>
                         </div>
 
                         <div>
-                            {_t("Values at explicit levels:")}
-                            <pre><code>{this.renderExplicitSettingValues(
+                            { _t("Values at explicit levels:") }
+                            <pre><code>{ this.renderExplicitSettingValues(
                                 this.state.viewSetting, null,
-                            )}</code></pre>
+                            ) }</code></pre>
                         </div>
 
                         <div>
-                            {_t("Values at explicit levels in this room:")}
-                            <pre><code>{this.renderExplicitSettingValues(
+                            { _t("Values at explicit levels in this room:") }
+                            <pre><code>{ this.renderExplicitSettingValues(
                                 this.state.viewSetting, room.roomId,
-                            )}</code></pre>
+                            ) }</code></pre>
                         </div>
 
                     </div>
@@ -1171,7 +1221,7 @@ class SettingsExplorer extends React.PureComponent<IExplorerProps, ISettingsExpl
                         <button onClick={(e) => this.onEditClick(e, this.state.viewSetting)}>{
                             _t("Edit Values")
                         }</button>
-                        <button onClick={this.onBack}>{_t("Back")}</button>
+                        <button onClick={this.onBack}>{ _t("Back") }</button>
                     </div>
                 </div>
             );
@@ -1232,12 +1282,12 @@ export default class DevtoolsDialog extends React.PureComponent<IProps, IState>
 
         if (this.state.mode) {
             body = <MatrixClientContext.Consumer>
-                {(cli) => <React.Fragment>
+                { (cli) => <React.Fragment>
                     <div className="mx_DevTools_label_left">{ this.state.mode.getLabel() }</div>
                     <div className="mx_DevTools_label_right">Room ID: { this.props.roomId }</div>
                     <div className="mx_DevTools_label_bottom" />
                     <this.state.mode onBack={this.onBack} room={cli.getRoom(this.props.roomId)} />
-                </React.Fragment>}
+                </React.Fragment> }
             </MatrixClientContext.Consumer>;
         } else {
             const classes = "mx_DevTools_RoomStateExplorer_button";

src/components/views/dialogs/EditCommunityPrototypeDialog.tsx

@@ -144,23 +144,25 @@ export default class EditCommunityPrototypeDialog extends React.PureComponent<IP
                         </div>
                         <div className="mx_EditCommunityPrototypeDialog_rowAvatar">
                             <input
-                                type="file" style={{ display: "none" }}
-                                ref={this.avatarUploadRef} accept="image/*"
+                                type="file"
+                                style={{ display: "none" }}
+                                ref={this.avatarUploadRef}
+                                accept="image/*"
                                 onChange={this.onAvatarChanged}
                             />
                             <AccessibleButton
                                 onClick={this.onChangeAvatar}
                                 className="mx_EditCommunityPrototypeDialog_avatarContainer"
-                            >{preview}</AccessibleButton>
+                            >{ preview }</AccessibleButton>
                             <div className="mx_EditCommunityPrototypeDialog_tip">
-                                <b>{_t("Add image (optional)")}</b>
+                                <b>{ _t("Add image (optional)") }</b>
                                 <span>
-                                    {_t("An image will help people identify your community.")}
+                                    { _t("An image will help people identify your community.") }
                                 </span>
                             </div>
                         </div>
                         <AccessibleButton kind="primary" onClick={this.onSubmit} disabled={this.state.busy}>
-                            {_t("Save")}
+                            { _t("Save") }
                         </AccessibleButton>
                     </div>
                 </form>

src/components/views/dialogs/FeedbackDialog.js

@@ -58,10 +58,10 @@ export default (props) => {
         countlyFeedbackSection = <React.Fragment>
             <hr />
             <div className="mx_FeedbackDialog_section mx_FeedbackDialog_rateApp">
-                <h3>{_t("Rate %(brand)s", { brand })}</h3>
+                <h3>{ _t("Rate %(brand)s", { brand }) }</h3>
 
-                <p>{_t("Tell us below how you feel about %(brand)s so far.", { brand })}</p>
-                <p>{_t("Please go into as much detail as you like, so we can track down the problem.")}</p>
+                <p>{ _t("Tell us below how you feel about %(brand)s so far.", { brand }) }</p>
+                <p>{ _t("Please go into as much detail as you like, so we can track down the problem.") }</p>
 
                 <StyledRadioGroup
                     name="feedbackRating"
@@ -95,7 +95,7 @@ export default (props) => {
     let subheading;
     if (hasFeedback) {
         subheading = (
-            <h2>{_t("There are two ways you can provide feedback and help us improve %(brand)s.", { brand })}</h2>
+            <h2>{ _t("There are two ways you can provide feedback and help us improve %(brand)s.", { brand }) }</h2>
         );
     }
 
@@ -106,7 +106,7 @@ export default (props) => {
                 _t("PRO TIP: If you start a bug, please submit <debugLogsLink>debug logs</debugLogsLink> " +
                     "to help us track down the problem.", {}, {
                     debugLogsLink: sub => (
-                        <AccessibleButton kind="link" onClick={onDebugLogsLinkClick}>{sub}</AccessibleButton>
+                        <AccessibleButton kind="link" onClick={onDebugLogsLinkClick}>{ sub }</AccessibleButton>
                     ),
                 })
             }</p>
@@ -121,7 +121,7 @@ export default (props) => {
             { subheading }
 
             <div className="mx_FeedbackDialog_section mx_FeedbackDialog_reportBug">
-                <h3>{_t("Report a bug")}</h3>
+                <h3>{ _t("Report a bug") }</h3>
                 <p>{
                     _t("Please view <existingIssuesLink>existing bugs on Github</existingIssuesLink> first. " +
                         "No match? <newIssueLink>Start a new one</newIssueLink>.", {}, {
@@ -133,7 +133,7 @@ export default (props) => {
                         },
                     })
                 }</p>
-                {bugReports}
+                { bugReports }
             </div>
             { countlyFeedbackSection }
         </React.Fragment>}

src/components/views/dialogs/ForwardDialog.tsx

@@ -43,6 +43,7 @@ import QueryMatcher from "../../../autocomplete/QueryMatcher";
 import TruncatedList from "../elements/TruncatedList";
 import EntityTile from "../rooms/EntityTile";
 import BaseAvatar from "../avatars/BaseAvatar";
+import SpaceStore from "../../../stores/SpaceStore";
 
 const AVATAR_SIZE = 30;
 
@@ -105,12 +106,12 @@ const Entry: React.FC<IEntryProps> = ({ room, event, matrixClient: cli, onFinish
         className = "mx_ForwardList_sending";
         disabled = true;
         title = _t("Sending");
-        icon = <div className="mx_ForwardList_sendIcon" aria-label={title}></div>;
+        icon = <div className="mx_ForwardList_sendIcon" aria-label={title} />;
     } else if (sendState === SendState.Sent) {
         className = "mx_ForwardList_sent";
         disabled = true;
         title = _t("Sent");
-        icon = <div className="mx_ForwardList_sendIcon" aria-label={title}></div>;
+        icon = <div className="mx_ForwardList_sendIcon" aria-label={title} />;
     } else {
         className = "mx_ForwardList_sendFailed";
         disabled = true;
@@ -180,7 +181,7 @@ const ForwardDialog: React.FC<IProps> = ({ matrixClient: cli, event, permalinkCr
     const [query, setQuery] = useState("");
     const lcQuery = query.toLowerCase();
 
-    const spacesEnabled = useFeatureEnabled("feature_spaces");
+    const spacesEnabled = SpaceStore.spacesEnabled;
     const flairEnabled = useFeatureEnabled(UIFeature.Flair);
     const previewLayout = useSettingValue<Layout>("layout");
 
@@ -203,10 +204,16 @@ const ForwardDialog: React.FC<IProps> = ({ matrixClient: cli, event, permalinkCr
     function overflowTile(overflowCount, totalCount) {
         const text = _t("and %(count)s others...", { count: overflowCount });
         return (
-            <EntityTile className="mx_EntityTile_ellipsis" avatarJsx={
-                <BaseAvatar url={require("../../../../res/img/ellipsis.svg")} name="..." width={36} height={36} />
-            } name={text} presenceState="online" suppressOnHover={true}
-            onClick={() => setTruncateAt(totalCount)} />
+            <EntityTile
+                className="mx_EntityTile_ellipsis"
+                avatarJsx={
+                    <BaseAvatar url={require("../../../../res/img/ellipsis.svg")} name="..." width={36} height={36} />
+                }
+                name={text}
+                presenceState="online"
+                suppressOnHover={true}
+                onClick={() => setTruncateAt(totalCount)}
+            />
         );
     }
 

src/components/views/dialogs/GenericFeatureFeedbackDialog.tsx

@@ -0,0 +1,101 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React, { useState } from "react";
+
+import QuestionDialog from './QuestionDialog';
+import { _t } from '../../../languageHandler';
+import Field from "../elements/Field";
+import SdkConfig from "../../../SdkConfig";
+import { IDialogProps } from "./IDialogProps";
+import { submitFeedback } from "../../../rageshake/submit-rageshake";
+import StyledCheckbox from "../elements/StyledCheckbox";
+import Modal from "../../../Modal";
+import InfoDialog from "./InfoDialog";
+
+interface IProps extends IDialogProps {
+    title: string;
+    subheading: string;
+    rageshakeLabel: string;
+    rageshakeData?: Record<string, string>;
+}
+
+const GenericFeatureFeedbackDialog: React.FC<IProps> = ({
+    title,
+    subheading,
+    children,
+    rageshakeLabel,
+    rageshakeData = {},
+    onFinished,
+}) => {
+    const [comment, setComment] = useState("");
+    const [canContact, setCanContact] = useState(false);
+
+    const sendFeedback = async (ok: boolean) => {
+        if (!ok) return onFinished(false);
+
+        submitFeedback(SdkConfig.get().bug_report_endpoint_url, rageshakeLabel, comment, canContact, rageshakeData);
+        onFinished(true);
+
+        Modal.createTrackedDialog("Feedback Sent", rageshakeLabel, InfoDialog, {
+            title,
+            description: _t("Thank you for your feedback, we really appreciate it."),
+            button: _t("Done"),
+            hasCloseButton: false,
+            fixedWidth: false,
+        });
+    };
+
+    return (<QuestionDialog
+        className="mx_GenericFeatureFeedbackDialog"
+        hasCancelButton={true}
+        title={title}
+        description={<React.Fragment>
+            <div className="mx_GenericFeatureFeedbackDialog_subheading">
+                { subheading }
+                &nbsp;
+                { _t("Your platform and username will be noted to help us use your feedback as much as we can.") }
+
+                { children }
+            </div>
+
+            <Field
+                id="feedbackComment"
+                label={_t("Feedback")}
+                type="text"
+                autoComplete="off"
+                value={comment}
+                element="textarea"
+                onChange={(ev) => {
+                    setComment(ev.target.value);
+                }}
+                autoFocus={true}
+            />
+
+            <StyledCheckbox
+                checked={canContact}
+                onChange={e => setCanContact((e.target as HTMLInputElement).checked)}
+            >
+                { _t("You may contact me if you have any follow up questions") }
+            </StyledCheckbox>
+        </React.Fragment>}
+        button={_t("Send feedback")}
+        buttonDisabled={!comment}
+        onFinished={sendFeedback}
+    />);
+};
+
+export default GenericFeatureFeedbackDialog;

src/components/views/dialogs/HostSignupDialog.tsx

@@ -177,32 +177,32 @@ export default class HostSignupDialog extends React.PureComponent<IProps, IState
         const textComponent = (
             <>
                 <p>
-                    {_t("Continuing temporarily allows the %(hostSignupBrand)s setup process to access your " +
+                    { _t("Continuing temporarily allows the %(hostSignupBrand)s setup process to access your " +
                         "account to fetch verified email addresses. This data is not stored.", {
                         hostSignupBrand: this.config.brand,
-                    })}
+                    }) }
                 </p>
                 <p>
-                    {_t("Learn more in our <privacyPolicyLink />, <termsOfServiceLink /> and <cookiePolicyLink />.",
+                    { _t("Learn more in our <privacyPolicyLink />, <termsOfServiceLink /> and <cookiePolicyLink />.",
                         {},
                         {
                             cookiePolicyLink: () => (
                                 <a href={this.config.cookiePolicyUrl} target="_blank" rel="noreferrer noopener">
-                                    {_t("Cookie Policy")}
+                                    { _t("Cookie Policy") }
                                 </a>
                             ),
                             privacyPolicyLink: () => (
                                 <a href={this.config.privacyPolicyUrl} target="_blank" rel="noreferrer noopener">
-                                    {_t("Privacy Policy")}
+                                    { _t("Privacy Policy") }
                                 </a>
                             ),
                             termsOfServiceLink: () => (
                                 <a href={this.config.termsOfServiceUrl} target="_blank" rel="noreferrer noopener">
-                                    {_t("Terms of Service")}
+                                    { _t("Terms of Service") }
                                 </a>
                             ),
                         },
-                    )}
+                    ) }
                 </p>
             </>
         );
@@ -241,12 +241,12 @@ export default class HostSignupDialog extends React.PureComponent<IProps, IState
                                 },
                             )}
                         >
-                            {this.state.minimized &&
+                            { this.state.minimized &&
                                 <div className="mx_Dialog_header mx_Dialog_headerWithButton">
                                     <div className="mx_Dialog_title">
-                                        {_t("%(hostSignupBrand)s Setup", {
+                                        { _t("%(hostSignupBrand)s Setup", {
                                             hostSignupBrand: this.config.brand,
-                                        })}
+                                        }) }
                                     </div>
                                     <AccessibleButton
                                         className="mx_HostSignup_maximize_button"
@@ -256,7 +256,7 @@ export default class HostSignupDialog extends React.PureComponent<IProps, IState
                                     />
                                 </div>
                             }
-                            {!this.state.minimized &&
+                            { !this.state.minimized &&
                                 <div className="mx_Dialog_header mx_Dialog_headerWithCancel">
                                     <AccessibleButton
                                         onClick={this.minimizeDialog}
@@ -272,12 +272,12 @@ export default class HostSignupDialog extends React.PureComponent<IProps, IState
                                     />
                                 </div>
                             }
-                            {this.state.error &&
+                            { this.state.error &&
                                 <div>
-                                    {this.state.error}
+                                    { this.state.error }
                                 </div>
                             }
-                            {!this.state.error &&
+                            { !this.state.error &&
                                 <iframe
                                     src={this.config.url}
                                     ref={this.iframeRef}

src/components/views/dialogs/IncomingSasDialog.js

@@ -133,55 +133,60 @@ export default class IncomingSasDialog extends React.Component {
                 ? mediaFromMxc(oppProfile.avatar_url).getSquareThumbnailHttp(48)
                 : null;
             profile = <div className="mx_IncomingSasDialog_opponentProfile">
-                <BaseAvatar name={oppProfile.displayname}
+                <BaseAvatar
+                    name={oppProfile.displayname}
                     idName={this.props.verifier.userId}
                     url={url}
-                    width={48} height={48} resizeMethod='crop'
+                    width={48}
+                    height={48}
+                    resizeMethod='crop'
                 />
-                <h2>{oppProfile.displayname}</h2>
+                <h2>{ oppProfile.displayname }</h2>
             </div>;
         } else if (this.state.opponentProfileError) {
             profile = <div>
-                <BaseAvatar name={this.props.verifier.userId.slice(1)}
+                <BaseAvatar
+                    name={this.props.verifier.userId.slice(1)}
                     idName={this.props.verifier.userId}
-                    width={48} height={48}
+                    width={48}
+                    height={48}
                 />
-                <h2>{this.props.verifier.userId}</h2>
+                <h2>{ this.props.verifier.userId }</h2>
             </div>;
         } else {
             profile = <Spinner />;
         }
 
         const userDetailText = [
-            <p key="p1">{_t(
+            <p key="p1">{ _t(
                 "Verify this user to mark them as trusted. " +
                 "Trusting users gives you extra peace of mind when using " +
                 "end-to-end encrypted messages.",
-            )}</p>,
-            <p key="p2">{_t(
+            ) }</p>,
+            <p key="p2">{ _t(
                 // NB. Below wording adjusted to singular 'session' until we have
                 // cross-signing
                 "Verifying this user will mark their session as trusted, and " +
                 "also mark your session as trusted to them.",
-            )}</p>,
+            ) }</p>,
         ];
 
         const selfDetailText = [
-            <p key="p1">{_t(
+            <p key="p1">{ _t(
                 "Verify this device to mark it as trusted. " +
                 "Trusting this device gives you and other users extra peace of mind when using " +
                 "end-to-end encrypted messages.",
-            )}</p>,
-            <p key="p2">{_t(
+            ) }</p>,
+            <p key="p2">{ _t(
                 "Verifying this device will mark it as trusted, and users who have verified with " +
                 "you will trust this device.",
-            )}</p>,
+            ) }</p>,
         ];
 
         return (
             <div>
-                {profile}
-                {isSelf ? selfDetailText : userDetailText}
+                { profile }
+                { isSelf ? selfDetailText : userDetailText }
                 <DialogButtons
                     primaryButton={_t('Continue')}
                     hasCancel={true}
@@ -209,7 +214,7 @@ export default class IncomingSasDialog extends React.Component {
         return (
             <div>
                 <Spinner />
-                <p>{_t("Waiting for partner to confirm...")}</p>
+                <p>{ _t("Waiting for partner to confirm...") }</p>
             </div>
         );
     }
@@ -251,7 +256,7 @@ export default class IncomingSasDialog extends React.Component {
                 onFinished={this._onFinished}
                 fixedWidth={false}
             >
-                {body}
+                { body }
             </BaseDialog>
         );
     }