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

 Conflicts:

	src/components/structures/LoggedInView.tsx

	src/components/views/rooms/BasicMessageComposer.tsx

	src/editor/autocomplete.ts

src/components/structures/ContextMenu.tsx

@@ -22,6 +22,7 @@ import classNames from "classnames";
 
 import {Key} from "../../Keyboard";
 import {Writeable} from "../../@types/common";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 // Shamelessly ripped off Modal.js.  There's probably a better way
 // of doing reusable widgets like dialog boxes & menus where we go and
@@ -76,6 +77,7 @@ export interface IProps extends IPosition {
     hasBackground?: boolean;
     // whether this context menu should be focus managed. If false it must handle itself
     managed?: boolean;
+    wrapperClassName?: string;
 
     // Function to be called on menu close
     onFinished();
@@ -90,6 +92,7 @@ interface IState {
 // Generic ContextMenu Portal wrapper
 // all options inside the menu should be of role=menuitem/menuitemcheckbox/menuitemradiobutton and have tabIndex={-1}
 // this will allow the ContextMenu to manage its own focus using arrow keys as per the ARIA guidelines.
+@replaceableComponent("structures.ContextMenu")
 export class ContextMenu extends React.PureComponent<IProps, IState> {
     private initialFocus: HTMLElement;
 
@@ -299,7 +302,7 @@ export class ContextMenu extends React.PureComponent<IProps, IState> {
             // such that it does not leave the (padded) window.
             if (contextMenuRect) {
                 const padding = 10;
-                adjusted = Math.min(position.top, document.body.clientHeight - contextMenuRect.height + padding);
+                adjusted = Math.min(position.top, document.body.clientHeight - contextMenuRect.height - padding);
             }
 
             position.top = adjusted;
@@ -365,7 +368,7 @@ export class ContextMenu extends React.PureComponent<IProps, IState> {
 
         return (
             <div
-                className="mx_ContextualMenu_wrapper"
+                className={classNames("mx_ContextualMenu_wrapper", this.props.wrapperClassName)}
                 style={{...position, ...wrapperStyle}}
                 onKeyDown={this.onKeyDown}
                 onContextMenu={this.onContextMenuPreventBubbling}
@@ -390,7 +393,7 @@ export class ContextMenu extends React.PureComponent<IProps, IState> {
 }
 
 // Placement method for <ContextMenu /> to position context menu to right of elementRect with chevronOffset
-export const toRightOf = (elementRect: DOMRect, chevronOffset = 12) => {
+export const toRightOf = (elementRect: Pick<DOMRect, "right" | "top" | "height">, chevronOffset = 12) => {
     const left = elementRect.right + window.pageXOffset + 3;
     let top = elementRect.top + (elementRect.height / 2) + window.pageYOffset;
     top -= chevronOffset + 8; // where 8 is half the height of the chevron
@@ -466,6 +469,7 @@ export const useContextMenu = <T extends any = HTMLElement>(): ContextMenuTuple<
     return [isOpen, button, open, close, setIsOpen];
 };
 
+@replaceableComponent("structures.LegacyContextMenu")
 export default class LegacyContextMenu extends ContextMenu {
     render() {
         return this.renderMenu(false);

src/components/structures/CustomRoomTagPanel.js

@@ -21,7 +21,9 @@ import * as sdk from '../../index';
 import dis from '../../dispatcher/dispatcher';
 import classNames from 'classnames';
 import * as FormattingUtils from '../../utils/FormattingUtils';
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
+@replaceableComponent("structures.CustomRoomTagPanel")
 class CustomRoomTagPanel extends React.Component {
     constructor(props) {
         super(props);

src/components/structures/EmbeddedPage.js

@@ -16,8 +16,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-'use strict';
-
 import React from 'react';
 import PropTypes from 'prop-types';
 import request from 'browser-request';

src/components/structures/FilePanel.js

@@ -18,7 +18,7 @@ limitations under the License.
 import React from 'react';
 import PropTypes from 'prop-types';
 
-import {Filter} from 'matrix-js-sdk';
+import {Filter} from 'matrix-js-sdk/src/filter';
 import * as sdk from '../../index';
 import {MatrixClientPeg} from '../../MatrixClientPeg';
 import EventIndexPeg from "../../indexing/EventIndexPeg";
@@ -26,10 +26,12 @@ import { _t } from '../../languageHandler';
 import BaseCard from "../views/right_panel/BaseCard";
 import {RightPanelPhases} from "../../stores/RightPanelStorePhases";
 import DesktopBuildsNotice, {WarningKind} from "../views/elements/DesktopBuildsNotice";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 /*
  * Component which shows the filtered file using a TimelinePanel
  */
+@replaceableComponent("structures.FilePanel")
 class FilePanel extends React.Component {
     static propTypes = {
         roomId: PropTypes.string.isRequired,
@@ -198,10 +200,10 @@ class FilePanel extends React.Component {
                 previousPhase={RightPanelPhases.RoomSummary}
             >
                 <div className="mx_RoomView_empty">
-                { _t("You must <a>register</a> to use this functionality",
-                    {},
-                    { 'a': (sub) => <a href="#/register" key="sub">{ sub }</a> })
-                }
+                    { _t("You must <a>register</a> to use this functionality",
+                        {},
+                        { 'a': (sub) => <a href="#/register" key="sub">{ sub }</a> })
+                    }
                 </div>
             </BaseCard>;
         } else if (this.noRoom) {

src/components/structures/GenericErrorPage.js

@@ -16,7 +16,9 @@ limitations under the License.
 
 import React from 'react';
 import PropTypes from 'prop-types';
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
+@replaceableComponent("structures.GenericErrorPage")
 export default class GenericErrorPage extends React.PureComponent {
     static propTypes = {
         title: PropTypes.object.isRequired, // jsx for title

src/components/structures/GroupFilterPanel.js

@@ -30,7 +30,9 @@ import MatrixClientContext from "../../contexts/MatrixClientContext";
 import AutoHideScrollbar from "./AutoHideScrollbar";
 import SettingsStore from "../../settings/SettingsStore";
 import UserTagTile from "../views/elements/UserTagTile";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
+@replaceableComponent("structures.GroupFilterPanel")
 class GroupFilterPanel extends React.Component {
     static contextType = MatrixClientContext;
 
@@ -151,17 +153,17 @@ class GroupFilterPanel extends React.Component {
                     type="draggable-TagTile"
                 >
                     { (provided, snapshot) => (
-                            <div
-                                className="mx_GroupFilterPanel_tagTileContainer"
-                                ref={provided.innerRef}
-                            >
-                                { this.renderGlobalIcon() }
-                                { tags }
-                                <div>
-                                    {createButton}
-                                </div>
-                                { provided.placeholder }
+                        <div
+                            className="mx_GroupFilterPanel_tagTileContainer"
+                            ref={provided.innerRef}
+                        >
+                            { this.renderGlobalIcon() }
+                            { tags }
+                            <div>
+                                {createButton}
                             </div>
+                            { provided.placeholder }
+                        </div>
                     ) }
                 </Droppable>
             </AutoHideScrollbar>

src/components/structures/GroupView.js

@@ -35,13 +35,15 @@ import GroupStore from '../../stores/GroupStore';
 import FlairStore from '../../stores/FlairStore';
 import { showGroupAddRoomDialog } from '../../GroupAddressPicker';
 import {makeGroupPermalink, makeUserPermalink} from "../../utils/permalinks/Permalinks";
-import {Group} from "matrix-js-sdk";
+import {Group} from "matrix-js-sdk/src/models/group";
 import {allSettled, sleep} from "../../utils/promise";
 import RightPanelStore from "../../stores/RightPanelStore";
 import AutoHideScrollbar from "./AutoHideScrollbar";
+import {mediaFromMxc} from "../../customisations/Media";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 const LONG_DESC_PLACEHOLDER = _td(
-`<h1>HTML for your community's page</h1>
+    `<h1>HTML for your community's page</h1>
 <p>
     Use the long description to introduce new members to the community, or distribute
     some important <a href="foo">links</a>
@@ -108,14 +110,16 @@ class CategoryRoomList extends React.Component {
                     const ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
                     Modal.createTrackedDialog(
                         'Failed to add the following room to the group summary',
-                        '', ErrorDialog,
-                    {
-                        title: _t(
-                            "Failed to add the following rooms to the summary of %(groupId)s:",
-                            {groupId: this.props.groupId},
-                        ),
-                        description: errorList.join(", "),
-                    });
+                        '',
+                        ErrorDialog,
+                        {
+                            title: _t(
+                                "Failed to add the following rooms to the summary of %(groupId)s:",
+                                {groupId: this.props.groupId},
+                            ),
+                            description: errorList.join(", "),
+                        },
+                    );
                 });
             },
         }, /*className=*/null, /*isPriority=*/false, /*isStatic=*/true);
@@ -144,8 +148,8 @@ class CategoryRoomList extends React.Component {
         let catHeader = <div />;
         if (this.props.category && this.props.category.profile) {
             catHeader = <div className="mx_GroupView_featuredThings_category">
-            { this.props.category.profile.name }
-        </div>;
+                { this.props.category.profile.name }
+            </div>;
         }
         return <div className="mx_GroupView_featuredThings_container">
             { catHeader }
@@ -188,13 +192,14 @@ class FeaturedRoom extends React.Component {
             Modal.createTrackedDialog(
                 'Failed to remove room from group summary',
                 '', ErrorDialog,
-            {
-                title: _t(
-                    "Failed to remove the room from the summary of %(groupId)s",
-                    {groupId: this.props.groupId},
-                ),
-                description: _t("The room '%(roomName)s' could not be removed from the summary.", {roomName}),
-            });
+                {
+                    title: _t(
+                        "Failed to remove the room from the summary of %(groupId)s",
+                        {groupId: this.props.groupId},
+                    ),
+                    description: _t("The room '%(roomName)s' could not be removed from the summary.", {roomName}),
+                },
+            );
         });
     };
 
@@ -281,13 +286,14 @@ class RoleUserList extends React.Component {
                     Modal.createTrackedDialog(
                         'Failed to add the following users to the community summary',
                         '', ErrorDialog,
-                    {
-                        title: _t(
-                            "Failed to add the following users to the summary of %(groupId)s:",
-                            {groupId: this.props.groupId},
-                        ),
-                        description: errorList.join(", "),
-                    });
+                        {
+                            title: _t(
+                                "Failed to add the following users to the summary of %(groupId)s:",
+                                {groupId: this.props.groupId},
+                            ),
+                            description: errorList.join(", "),
+                        },
+                    );
                 });
             },
         }, /*className=*/null, /*isPriority=*/false, /*isStatic=*/true);
@@ -297,11 +303,11 @@ class RoleUserList extends React.Component {
         const TintableSvg = sdk.getComponent("elements.TintableSvg");
         const addButton = this.props.editing ?
             (<AccessibleButton className="mx_GroupView_featuredThings_addButton" onClick={this.onAddUsersClicked}>
-                 <TintableSvg src={require("../../../res/img/icons-create-room.svg")} width="64" height="64" />
-                 <div className="mx_GroupView_featuredThings_addButton_label">
-                     { _t('Add a User') }
-                 </div>
-             </AccessibleButton>) : <div />;
+                <TintableSvg src={require("../../../res/img/icons-create-room.svg")} width="64" height="64" />
+                <div className="mx_GroupView_featuredThings_addButton_label">
+                    { _t('Add a User') }
+                </div>
+            </AccessibleButton>) : <div />;
         const userNodes = this.props.users.map((u) => {
             return <FeaturedUser
                 key={u.user_id}
@@ -350,14 +356,16 @@ class FeaturedUser extends React.Component {
             const ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
             Modal.createTrackedDialog(
                 'Failed to remove user from community summary',
-                '', ErrorDialog,
-            {
-                title: _t(
-                    "Failed to remove a user from the summary of %(groupId)s",
-                    {groupId: this.props.groupId},
-                ),
-                description: _t("The user '%(displayName)s' could not be removed from the summary.", {displayName}),
-            });
+                '',
+                ErrorDialog,
+                {
+                    title: _t(
+                        "Failed to remove a user from the summary of %(groupId)s",
+                        {groupId: this.props.groupId},
+                    ),
+                    description: _t("The user '%(displayName)s' could not be removed from the summary.", {displayName}),
+                },
+            );
         });
     };
 
@@ -367,8 +375,7 @@ class FeaturedUser extends React.Component {
 
         const permalink = makeUserPermalink(this.props.summaryInfo.user_id);
         const userNameNode = <a href={permalink} onClick={this.onClick}>{ name }</a>;
-        const httpUrl = MatrixClientPeg.get()
-            .mxcUrlToHttp(this.props.summaryInfo.avatar_url, 64, 64);
+        const httpUrl = mediaFromMxc(this.props.summaryInfo.avatar_url).getSquareThumbnailHttp(64);
 
         const deleteButton = this.props.editing ?
             <img
@@ -391,6 +398,7 @@ class FeaturedUser extends React.Component {
 const GROUP_JOINPOLICY_OPEN = "open";
 const GROUP_JOINPOLICY_INVITE = "invite";
 
+@replaceableComponent("structures.GroupView")
 export default class GroupView extends React.Component {
     static propTypes = {
         groupId: PropTypes.string.isRequired,
@@ -765,8 +773,8 @@ export default class GroupView extends React.Component {
             title: _t("Leave Community"),
             description: (
                 <span>
-                { _t("Leave %(groupName)s?", {groupName: this.props.groupId}) }
-                { warnings }
+                    { _t("Leave %(groupName)s?", {groupName: this.props.groupId}) }
+                    { warnings }
                 </span>
             ),
             button: _t("Leave"),
@@ -979,10 +987,9 @@ export default class GroupView extends React.Component {
                     <Spinner />
                 </div>;
             }
-            const httpInviterAvatar = this.state.inviterProfile ?
-                this._matrixClient.mxcUrlToHttp(
-                    this.state.inviterProfile.avatarUrl, 36, 36,
-                ) : null;
+            const httpInviterAvatar = this.state.inviterProfile && this.state.inviterProfile.avatarUrl
+                ? mediaFromMxc(this.state.inviterProfile.avatarUrl).getSquareThumbnailHttp(36)
+                : null;
 
             const inviter = group.inviter || {};
             let inviterName = inviter.userId;
@@ -1054,10 +1061,11 @@ export default class GroupView extends React.Component {
             return null;
         }
 
-        const membershipButtonClasses = classnames([
-            'mx_RoomHeader_textButton',
-            'mx_GroupView_textButton',
-        ],
+        const membershipButtonClasses = classnames(
+            [
+                'mx_RoomHeader_textButton',
+                'mx_GroupView_textButton',
+            ],
             membershipButtonExtraClasses,
         );
 

src/components/structures/HostSignupAction.tsx

@@ -22,11 +22,13 @@ import {
 import { _t } from "../../languageHandler";
 import { HostSignupStore } from "../../stores/HostSignupStore";
 import SdkConfig from "../../SdkConfig";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 interface IProps {}
 
 interface IState {}
 
+@replaceableComponent("structures.HostSignupAction")
 export default class HostSignupAction extends React.PureComponent<IProps, IState> {
     private openDialog = async () => {
         await HostSignupStore.instance.setHostSignupActive(true);

src/components/structures/IndicatorScrollbar.js

@@ -17,7 +17,9 @@ limitations under the License.
 import React from "react";
 import PropTypes from "prop-types";
 import AutoHideScrollbar from "./AutoHideScrollbar";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
+@replaceableComponent("structures.IndicatorScrollbar")
 export default class IndicatorScrollbar extends React.Component {
     static propTypes = {
         // If true, the scrollbar will append mx_IndicatorScrollbar_leftOverflowIndicator

src/components/structures/InteractiveAuth.js

@@ -15,16 +15,18 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {InteractiveAuth} from "matrix-js-sdk";
+import {InteractiveAuth} from "matrix-js-sdk/src/interactive-auth";
 import React, {createRef} from 'react';
 import PropTypes from 'prop-types';
 
 import getEntryComponentForLoginType from '../views/auth/InteractiveAuthEntryComponents';
 
 import * as sdk from '../../index';
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 export const ERROR_USER_CANCELLED = new Error("User cancelled auth session");
 
+@replaceableComponent("structures.InteractiveAuthComponent")
 export default class InteractiveAuthComponent extends React.Component {
     static propTypes = {
         // matrix client to use for UI auth requests

src/components/structures/LeftPanel.tsx

@@ -16,9 +16,11 @@ limitations under the License.
 
 import * as React from "react";
 import { createRef } from "react";
+import classNames from "classnames";
+import { Room } from "matrix-js-sdk/src/models/room";
+
 import GroupFilterPanel from "./GroupFilterPanel";
 import CustomRoomTagPanel from "./CustomRoomTagPanel";
-import classNames from "classnames";
 import dis from "../../dispatcher/dispatcher";
 import { _t } from "../../languageHandler";
 import RoomList from "../views/rooms/RoomList";
@@ -32,13 +34,15 @@ import { UPDATE_EVENT } from "../../stores/AsyncStore";
 import ResizeNotifier from "../../utils/ResizeNotifier";
 import SettingsStore from "../../settings/SettingsStore";
 import RoomListStore, { LISTS_UPDATE_EVENT } from "../../stores/room-list/RoomListStore";
-import {Key} from "../../Keyboard";
 import IndicatorScrollbar from "../structures/IndicatorScrollbar";
 import AccessibleTooltipButton from "../views/elements/AccessibleTooltipButton";
 import { OwnProfileStore } from "../../stores/OwnProfileStore";
-import { MatrixClientPeg } from "../../MatrixClientPeg";
 import RoomListNumResults from "../views/rooms/RoomListNumResults";
 import LeftPanelWidget from "./LeftPanelWidget";
+import {replaceableComponent} from "../../utils/replaceableComponent";
+import {mediaFromMxc} from "../../customisations/Media";
+import SpaceStore, {UPDATE_SELECTED_SPACE} from "../../stores/SpaceStore";
+import { getKeyBindingsManager, RoomListAction } from "../../KeyBindingsManager";
 
 interface IProps {
     isMinimized: boolean;
@@ -48,6 +52,7 @@ interface IProps {
 interface IState {
     showBreadcrumbs: boolean;
     showGroupFilterPanel: boolean;
+    activeSpace?: Room;
 }
 
 // List of CSS classes which should be included in keyboard navigation within the room list
@@ -59,6 +64,7 @@ const cssClasses = [
     "mx_RoomSublist_showNButton",
 ];
 
+@replaceableComponent("structures.LeftPanel")
 export default class LeftPanel extends React.Component<IProps, IState> {
     private listContainerRef: React.RefObject<HTMLDivElement> = createRef();
     private groupFilterPanelWatcherRef: string;
@@ -72,11 +78,13 @@ export default class LeftPanel extends React.Component<IProps, IState> {
         this.state = {
             showBreadcrumbs: BreadcrumbsStore.instance.visible,
             showGroupFilterPanel: SettingsStore.getValue('TagPanel.enableTagPanel'),
+            activeSpace: SpaceStore.instance.activeSpace,
         };
 
         BreadcrumbsStore.instance.on(UPDATE_EVENT, this.onBreadcrumbsUpdate);
         RoomListStore.instance.on(LISTS_UPDATE_EVENT, this.onBreadcrumbsUpdate);
         OwnProfileStore.instance.on(UPDATE_EVENT, this.onBackgroundImageUpdate);
+        SpaceStore.instance.on(UPDATE_SELECTED_SPACE, this.updateActiveSpace);
         this.bgImageWatcherRef = SettingsStore.watchSetting(
             "RoomList.backgroundImage", null, this.onBackgroundImageUpdate);
         this.groupFilterPanelWatcherRef = SettingsStore.watchSetting("TagPanel.enableTagPanel", null, () => {
@@ -94,9 +102,14 @@ export default class LeftPanel extends React.Component<IProps, IState> {
         BreadcrumbsStore.instance.off(UPDATE_EVENT, this.onBreadcrumbsUpdate);
         RoomListStore.instance.off(LISTS_UPDATE_EVENT, this.onBreadcrumbsUpdate);
         OwnProfileStore.instance.off(UPDATE_EVENT, this.onBackgroundImageUpdate);
+        SpaceStore.instance.off(UPDATE_SELECTED_SPACE, this.updateActiveSpace);
         this.props.resizeNotifier.off("middlePanelResizedNoisy", this.onResize);
     }
 
+    private updateActiveSpace = (activeSpace: Room) => {
+        this.setState({ activeSpace });
+    };
+
     private onExplore = () => {
         dis.fire(Action.ViewRoomDirectory);
     };
@@ -118,7 +131,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
         let avatarUrl = OwnProfileStore.instance.getHttpAvatarUrl(avatarSize);
         const settingBgMxc = SettingsStore.getValue("RoomList.backgroundImage");
         if (settingBgMxc) {
-            avatarUrl = MatrixClientPeg.get().mxcUrlToHttp(settingBgMxc, avatarSize, avatarSize);
+            avatarUrl = mediaFromMxc(settingBgMxc).getSquareThumbnailHttp(avatarSize);
         }
 
         const avatarUrlProp = `url(${avatarUrl})`;
@@ -141,7 +154,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
     private doStickyHeaders(list: HTMLDivElement) {
         const topEdge = list.scrollTop;
         const bottomEdge = list.offsetHeight + list.scrollTop;
-        const sublists = list.querySelectorAll<HTMLDivElement>(".mx_RoomSublist");
+        const sublists = list.querySelectorAll<HTMLDivElement>(".mx_RoomSublist:not(.mx_RoomSublist_hidden)");
 
         const headerRightMargin = 15; // calculated from margins and widths to align with non-sticky tiles
         const headerStickyWidth = list.clientWidth - headerRightMargin;
@@ -284,17 +297,18 @@ export default class LeftPanel extends React.Component<IProps, IState> {
     private onKeyDown = (ev: React.KeyboardEvent) => {
         if (!this.focusedElement) return;
 
-        switch (ev.key) {
-            case Key.ARROW_UP:
-            case Key.ARROW_DOWN:
+        const action = getKeyBindingsManager().getRoomListAction(ev);
+        switch (action) {
+            case RoomListAction.NextRoom:
+            case RoomListAction.PrevRoom:
                 ev.stopPropagation();
                 ev.preventDefault();
-                this.onMoveFocus(ev.key === Key.ARROW_UP);
+                this.onMoveFocus(action === RoomListAction.PrevRoom);
                 break;
         }
     };
 
-    private onEnter = () => {
+    private selectRoom = () => {
         const firstRoom = this.listContainerRef.current.querySelector<HTMLDivElement>(".mx_RoomTile");
         if (firstRoom) {
             firstRoom.click();
@@ -333,7 +347,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
             if (element) {
                 classes = element.classList;
             }
-        } while (element && !cssClasses.some(c => classes.contains(c)));
+        } while (element && (!cssClasses.some(c => classes.contains(c)) || element.offsetParent === null));
 
         if (element) {
             element.focus();
@@ -375,11 +389,13 @@ export default class LeftPanel extends React.Component<IProps, IState> {
             >
                 <RoomSearch
                     isMinimized={this.props.isMinimized}
-                    onVerticalArrow={this.onKeyDown}
-                    onEnter={this.onEnter}
+                    onKeyDown={this.onKeyDown}
+                    onSelectRoom={this.selectRoom}
                 />
                 <AccessibleTooltipButton
-                    className="mx_LeftPanel_exploreButton"
+                    className={classNames("mx_LeftPanel_exploreButton", {
+                        mx_LeftPanel_exploreButton_space: !!this.state.activeSpace,
+                    })}
                     onClick={this.onExplore}
                     title={_t("Explore rooms")}
                 />
@@ -388,25 +404,28 @@ export default class LeftPanel extends React.Component<IProps, IState> {
     }
 
     public render(): React.ReactNode {
-        const groupFilterPanel = !this.state.showGroupFilterPanel ? null : (
-            <div className="mx_LeftPanel_GroupFilterPanelContainer">
-                <GroupFilterPanel />
-                {SettingsStore.getValue("feature_custom_tags") ? <CustomRoomTagPanel /> : null}
-            </div>
-        );
+        let leftLeftPanel;
+        if (this.state.showGroupFilterPanel) {
+            leftLeftPanel = (
+                <div className="mx_LeftPanel_GroupFilterPanelContainer">
+                    <GroupFilterPanel />
+                    {SettingsStore.getValue("feature_custom_tags") ? <CustomRoomTagPanel /> : null}
+                </div>
+            );
+        }
 
         const roomList = <RoomList
             onKeyDown={this.onKeyDown}
-            resizeNotifier={null}
+            resizeNotifier={this.props.resizeNotifier}
             onFocus={this.onFocus}
             onBlur={this.onBlur}
             isMinimized={this.props.isMinimized}
             onResize={this.onResize}
+            activeSpace={this.state.activeSpace}
         />;
 
         const containerClasses = classNames({
             "mx_LeftPanel": true,
-            "mx_LeftPanel_hasGroupFilterPanel": !!groupFilterPanel,
             "mx_LeftPanel_minimized": this.props.isMinimized,
         });
 
@@ -417,7 +436,7 @@ export default class LeftPanel extends React.Component<IProps, IState> {
 
         return (
             <div className={containerClasses}>
-                {groupFilterPanel}
+                {leftLeftPanel}
                 <aside className="mx_LeftPanel_roomListContainer">
                     {this.renderHeader()}
                     {this.renderSearchExplore()}

src/components/structures/LoggedInView.tsx

@@ -21,7 +21,7 @@ import * as PropTypes from 'prop-types';
 import { MatrixClient } from 'matrix-js-sdk/src/client';
 import { DragDropContext } from 'react-beautiful-dnd';
 
-import {Key, isOnlyCtrlOrCmdKeyEvent, isOnlyCtrlOrCmdIgnoreShiftKeyEvent, isMac} from '../../Keyboard';
+import {Key} from '../../Keyboard';
 import PageTypes from '../../PageTypes';
 import CallMediaHandler from '../../CallMediaHandler';
 import { fixupColorFonts } from '../../utils/FontManager';
@@ -55,6 +55,13 @@ import { IThreepidInvite } from "../../stores/ThreepidInviteStore";
 import Modal from "../../Modal";
 import { ICollapseConfig } from "../../resizer/distributors/collapse";
 import HostSignupContainer from '../views/host_signup/HostSignupContainer';
+import { getKeyBindingsManager, NavigationAction, RoomAction } from '../../KeyBindingsManager';
+import { IOpts } from "../../createRoom";
+import SpacePanel from "../views/spaces/SpacePanel";
+import {replaceableComponent} from "../../utils/replaceableComponent";
+import CallHandler, { CallHandlerEvent } from '../../CallHandler';
+import { MatrixCall } from 'matrix-js-sdk/src/webrtc/call';
+import AudioFeedArrayForCall from '../views/voip/AudioFeedArrayForCall';
 
 // 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.
@@ -71,7 +78,6 @@ function canElementReceiveInput(el) {
 interface IProps {
     matrixClient: MatrixClient;
     onRegistered: (credentials: IMatrixClientCreds) => Promise<MatrixClient>;
-    viaServers?: string[];
     hideToSRUsers: boolean;
     resizeNotifier: ResizeNotifier;
     // eslint-disable-next-line camelcase
@@ -91,11 +97,14 @@ interface IProps {
     currentGroupId?: string;
     currentGroupIsNew?: boolean;
     justRegistered?: boolean;
+    roomJustCreatedOpts?: IOpts;
 }
 
 interface IUsageLimit {
+    // "hs_disabled" is NOT a specced string, but is used in Synapse
+    // This is tracked over at https://github.com/matrix-org/synapse/issues/9237
     // eslint-disable-next-line camelcase
-    limit_type: "monthly_active_user" | string;
+    limit_type: "monthly_active_user" | "hs_disabled" | string;
     // eslint-disable-next-line camelcase
     admin_contact?: string;
 }
@@ -103,12 +112,17 @@ interface IUsageLimit {
 interface IState {
     syncErrorData?: {
         error: {
+            // This is not specced, but used in Synapse. See
+            // https://github.com/matrix-org/synapse/issues/9237#issuecomment-768238922
             data: IUsageLimit;
             errcode: string;
         };
     };
+    usageLimitDismissed: boolean;
     usageLimitEventContent?: IUsageLimit;
+    usageLimitEventTs?: number;
     useCompactLayout: boolean;
+    activeCalls: Array<MatrixCall>;
 }
 
 /**
@@ -120,6 +134,7 @@ interface IState {
  *
  * Components mounted below us can access the matrix client via the react context.
  */
+@replaceableComponent("structures.LoggedInView")
 class LoggedInView extends React.Component<IProps, IState> {
     static displayName = 'LoggedInView';
 
@@ -132,9 +147,6 @@ class LoggedInView extends React.Component<IProps, IState> {
         // transitioned to PWLU)
         onRegistered: PropTypes.func,
 
-        // Used by the RoomView to handle joining rooms
-        viaServers: PropTypes.arrayOf(PropTypes.string),
-
         // and lots and lots of other stuff.
     };
 
@@ -151,6 +163,8 @@ class LoggedInView extends React.Component<IProps, IState> {
             syncErrorData: undefined,
             // use compact timeline view
             useCompactLayout: SettingsStore.getValue('useCompactLayout'),
+            usageLimitDismissed: false,
+            activeCalls: [],
         };
 
         // stash the MatrixClient in case we log out before we are unmounted
@@ -166,6 +180,7 @@ class LoggedInView extends React.Component<IProps, IState> {
 
     componentDidMount() {
         document.addEventListener('keydown', this._onNativeKeyDown, false);
+        CallHandler.sharedInstance().addListener(CallHandlerEvent.CallsChanged, this.onCallsChanged);
 
         this._updateServerNoticeEvents();
 
@@ -190,6 +205,7 @@ class LoggedInView extends React.Component<IProps, IState> {
 
     componentWillUnmount() {
         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);
         this._matrixClient.removeListener("RoomState.events", this.onRoomStateEvents);
@@ -197,6 +213,12 @@ class LoggedInView extends React.Component<IProps, IState> {
         this.resizer.detach();
     }
 
+    private onCallsChanged = () => {
+        this.setState({
+            activeCalls: CallHandler.sharedInstance().getAllActiveCalls(),
+        });
+    };
+
     // Child components assume that the client peg will not be null, so give them some
     // sort of assurance here by only allowing a re-render if the client is truthy.
     //
@@ -218,14 +240,15 @@ class LoggedInView extends React.Component<IProps, IState> {
         let size;
         let collapsed;
         const collapseConfig: ICollapseConfig = {
-            toggleSize: 260 - 50,
+            // 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) {
-                    dis.dispatch({action: "hide_left_panel"}, true);
+                    dis.dispatch({action: "hide_left_panel"});
                     window.localStorage.setItem("mx_lhs_size", '0');
                 } else {
-                    dis.dispatch({action: "show_left_panel"}, true);
+                    dis.dispatch({action: "show_left_panel"});
                 }
             },
             onResized: (_size) => {
@@ -239,6 +262,9 @@ class LoggedInView extends React.Component<IProps, IState> {
                 if (!collapsed) window.localStorage.setItem("mx_lhs_size", '' + size);
                 this.props.resizeNotifier.stopResizing();
             },
+            isItemCollapsed: domNode => {
+                return domNode.classList.contains("mx_LeftPanel_minimized");
+            },
         };
         const resizer = new Resizer(this._resizeContainer.current, CollapseDistributor, collapseConfig);
         resizer.setClassNames({
@@ -302,14 +328,27 @@ class LoggedInView extends React.Component<IProps, IState> {
         }
     };
 
+    private onUsageLimitDismissed = () => {
+        this.setState({
+            usageLimitDismissed: true,
+        });
+    }
+
     _calculateServerLimitToast(syncError: IState["syncErrorData"], usageLimitEventContent?: IUsageLimit) {
         const error = syncError && syncError.error && syncError.error.errcode === "M_RESOURCE_LIMIT_EXCEEDED";
         if (error) {
             usageLimitEventContent = syncError.error.data;
         }
 
-        if (usageLimitEventContent) {
-            showServerLimitToast(usageLimitEventContent.limit_type, usageLimitEventContent.admin_contact, error);
+        // usageLimitDismissed is true when the user has explicitly hidden the toast
+        // and it will be reset to false if a *new* usage alert comes in.
+        if (usageLimitEventContent && this.state.usageLimitDismissed) {
+            showServerLimitToast(
+                usageLimitEventContent.limit_type,
+                this.onUsageLimitDismissed,
+                usageLimitEventContent.admin_contact,
+                error,
+            );
         } else {
             hideServerLimitToast();
         }
@@ -320,10 +359,12 @@ class LoggedInView extends React.Component<IProps, IState> {
         if (!serverNoticeList) return [];
 
         const events = [];
+        let pinnedEventTs = 0;
         for (const room of serverNoticeList) {
             const pinStateEvent = room.currentState.getStateEvents("m.room.pinned_events", "");
 
             if (!pinStateEvent || !pinStateEvent.getContent().pinned) continue;
+            pinnedEventTs = pinStateEvent.getTs();
 
             const pinnedEventIds = pinStateEvent.getContent().pinned.slice(0, MAX_PINNED_NOTICES_PER_ROOM);
             for (const eventId of pinnedEventIds) {
@@ -333,6 +374,11 @@ class LoggedInView extends React.Component<IProps, IState> {
             }
         }
 
+        if (pinnedEventTs && this.state.usageLimitEventTs > pinnedEventTs) {
+            // We've processed a newer event than this one, so ignore it.
+            return;
+        }
+
         const usageLimitEvent = events.find((e) => {
             return (
                 e && e.getType() === 'm.room.message' &&
@@ -341,7 +387,12 @@ class LoggedInView extends React.Component<IProps, IState> {
         });
         const usageLimitEventContent = usageLimitEvent && usageLimitEvent.getContent();
         this._calculateServerLimitToast(this.state.syncErrorData, usageLimitEventContent);
-        this.setState({ usageLimitEventContent });
+        this.setState({
+            usageLimitEventContent,
+            usageLimitEventTs: pinnedEventTs,
+            // This is a fresh toast, we can show toasts again
+            usageLimitDismissed: false,
+        });
     };
 
     _onPaste = (ev) => {
@@ -399,86 +450,55 @@ class LoggedInView extends React.Component<IProps, IState> {
 
     _onKeyDown = (ev) => {
         let handled = false;
-        const ctrlCmdOnly = isOnlyCtrlOrCmdKeyEvent(ev);
-        const hasModifier = ev.altKey || ev.ctrlKey || ev.metaKey || ev.shiftKey;
-        const isModifier = ev.key === Key.ALT || ev.key === Key.CONTROL || ev.key === Key.META || ev.key === Key.SHIFT;
-        const modKey = isMac ? ev.metaKey : ev.ctrlKey;
 
-        switch (ev.key) {
-            case Key.PAGE_UP:
-            case Key.PAGE_DOWN:
-                if (!hasModifier && !isModifier) {
-                    this._onScrollKeyPressed(ev);
-                    handled = true;
-                }
+        const roomAction = getKeyBindingsManager().getRoomAction(ev);
+        switch (roomAction) {
+            case RoomAction.ScrollUp:
+            case RoomAction.RoomScrollDown:
+            case RoomAction.JumpToFirstMessage:
+            case RoomAction.JumpToLatestMessage:
+                // pass the event down to the scroll panel
+                this._onScrollKeyPressed(ev);
+                handled = true;
                 break;
+            case RoomAction.FocusSearch:
+                dis.dispatch({
+                    action: 'focus_search',
+                });
+                handled = true;
+                break;
+        }
+        if (handled) {
+            ev.stopPropagation();
+            ev.preventDefault();
+            return;
+        }
 
-            case Key.HOME:
-            case Key.END:
-                if (ev.ctrlKey && !ev.shiftKey && !ev.altKey && !ev.metaKey) {
-                    this._onScrollKeyPressed(ev);
-                    handled = true;
-                }
+        const navAction = getKeyBindingsManager().getNavigationAction(ev);
+        switch (navAction) {
+            case NavigationAction.FocusRoomSearch:
+                dis.dispatch({
+                    action: 'focus_room_filter',
+                });
+                handled = true;
                 break;
-            case Key.K:
-                if (ctrlCmdOnly) {
-                    dis.dispatch({
-                        action: 'focus_room_filter',
-                    });
-                    handled = true;
-                }
+            case NavigationAction.ToggleUserMenu:
+                dis.fire(Action.ToggleUserMenu);
+                handled = true;
                 break;
-            case Key.F:
-                if (ctrlCmdOnly && SettingsStore.getValue("ctrlFForSearch")) {
-                    dis.dispatch({
-                        action: 'focus_search',
-                    });
-                    handled = true;
-                }
+            case NavigationAction.ToggleShortCutDialog:
+                KeyboardShortcuts.toggleDialog();
+                handled = true;
                 break;
-            case Key.BACKTICK:
-                // Ideally this would be CTRL+P for "Profile", but that's
-                // taken by the print dialog. CTRL+I for "Information"
-                // was previously chosen but conflicted with italics in
-                // composer, so CTRL+` it is
-
-                if (ctrlCmdOnly) {
-                    dis.fire(Action.ToggleUserMenu);
-                    handled = true;
-                }
+            case NavigationAction.GoToHome:
+                dis.dispatch({
+                    action: 'view_home_page',
+                });
+                Modal.closeCurrentModal("homeKeyboardShortcut");
+                handled = true;
                 break;
-
-            case Key.SLASH:
-                if (isOnlyCtrlOrCmdIgnoreShiftKeyEvent(ev)) {
-                    KeyboardShortcuts.toggleDialog();
-                    handled = true;
-                }
-                break;
-
-            case Key.H:
-                if (ev.altKey && modKey) {
-                    dis.dispatch({
-                        action: 'view_home_page',
-                    });
-                    Modal.closeCurrentModal("homeKeyboardShortcut");
-                    handled = true;
-                }
-                break;
-
-            case Key.ARROW_UP:
-            case Key.ARROW_DOWN:
-                if (ev.altKey && !ev.ctrlKey && !ev.metaKey) {
-                    dis.dispatch<ViewRoomDeltaPayload>({
-                        action: Action.ViewRoomDelta,
-                        delta: ev.key === Key.ARROW_UP ? -1 : 1,
-                        unread: ev.shiftKey,
-                    });
-                    handled = true;
-                }
-                break;
-
-            case Key.PERIOD:
-                if (ctrlCmdOnly && (this.props.page_type === "room_view" || this.props.page_type === "group_view")) {
+            case NavigationAction.ToggleRoomSidePanel:
+                if (this.props.page_type === "room_view" || this.props.page_type === "group_view") {
                     dis.dispatch<ToggleRightPanelPayload>({
                         action: Action.ToggleRightPanel,
                         type: this.props.page_type === "room_view" ? "room" : "group",
@@ -486,16 +506,48 @@ class LoggedInView extends React.Component<IProps, IState> {
                     handled = true;
                 }
                 break;
-
+            case NavigationAction.SelectPrevRoom:
+                dis.dispatch<ViewRoomDeltaPayload>({
+                    action: Action.ViewRoomDelta,
+                    delta: -1,
+                    unread: false,
+                });
+                handled = true;
+                break;
+            case NavigationAction.SelectNextRoom:
+                dis.dispatch<ViewRoomDeltaPayload>({
+                    action: Action.ViewRoomDelta,
+                    delta: 1,
+                    unread: false,
+                });
+                handled = true;
+                break;
+            case NavigationAction.SelectPrevUnreadRoom:
+                dis.dispatch<ViewRoomDeltaPayload>({
+                    action: Action.ViewRoomDelta,
+                    delta: -1,
+                    unread: true,
+                });
+                break;
+            case NavigationAction.SelectNextUnreadRoom:
+                dis.dispatch<ViewRoomDeltaPayload>({
+                    action: Action.ViewRoomDelta,
+                    delta: 1,
+                    unread: true,
+                });
+                break;
             default:
                 // if we do not have a handler for it, pass it to the platform which might
                 handled = PlatformPeg.get().onKeyDown(ev);
         }
-
         if (handled) {
             ev.stopPropagation();
             ev.preventDefault();
-        } else if (!isModifier && !ev.ctrlKey && !ev.metaKey) {
+            return;
+        }
+
+        const isModifier = ev.key === Key.ALT || ev.key === Key.CONTROL || ev.key === Key.META || ev.key === Key.SHIFT;
+        if (!isModifier && !ev.ctrlKey && !ev.metaKey) {
             // The above condition is crafted to _allow_ characters with Shift
             // already pressed (but not the Shift key down itself).
             const isClickShortcut = ev.target !== document.body &&
@@ -584,13 +636,12 @@ class LoggedInView extends React.Component<IProps, IState> {
             case PageTypes.RoomView:
                 pageElement = <RoomView
                     ref={this._roomView}
-                    autoJoin={this.props.autoJoin}
                     onRegistered={this.props.onRegistered}
                     threepidInvite={this.props.threepidInvite}
                     oobData={this.props.roomOobData}
-                    viaServers={this.props.viaServers}
                     key={this.props.currentRoomId || 'roomview'}
                     resizeNotifier={this.props.resizeNotifier}
+                    justCreatedOpts={this.props.roomJustCreatedOpts}
                 />;
                 break;
 
@@ -623,12 +674,11 @@ class LoggedInView extends React.Component<IProps, IState> {
             bodyClasses += ' mx_MatrixChat_useCompactLayout';
         }
 
-        const leftPanel = (
-            <LeftPanel
-                isMinimized={this.props.collapseLhs || false}
-                resizeNotifier={this.props.resizeNotifier}
-            />
-        );
+        const audioFeedArraysForCalls = this.state.activeCalls.map((call) => {
+            return (
+                <AudioFeedArrayForCall call={call} key={call.callId} />
+            );
+        });
 
         return (
             <MatrixClientContext.Provider value={this._matrixClient}>
@@ -641,7 +691,11 @@ class LoggedInView extends React.Component<IProps, IState> {
                     <ToastContainer />
                     <DragDropContext onDragEnd={this._onDragEnd}>
                         <div ref={this._resizeContainer} className={bodyClasses}>
-                            { leftPanel }
+                            { SettingsStore.getValue("feature_spaces") ? <SpacePanel /> : null }
+                            <LeftPanel
+                                isMinimized={this.props.collapseLhs || false}
+                                resizeNotifier={this.props.resizeNotifier}
+                            />
                             <ResizeHandle />
                             { pageElement }
                         </div>
@@ -650,6 +704,7 @@ class LoggedInView extends React.Component<IProps, IState> {
                 <CallContainer />
                 <NonUrgentToastContainer />
                 <HostSignupContainer />
+                {audioFeedArraysForCalls}
             </MatrixClientContext.Provider>
         );
     }

src/components/structures/MainSplit.js

@@ -17,7 +17,9 @@ limitations under the License.
 
 import React from 'react';
 import { Resizable } from 're-resizable';
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
+@replaceableComponent("structures.MainSplit")
 export default class MainSplit extends React.Component {
     _onResizeStart = () => {
         this.props.resizeNotifier.startResizing();

src/components/structures/MatrixChat.tsx

@@ -1,8 +1,5 @@
 /*
-Copyright 2015, 2016 OpenMarket Ltd
-Copyright 2017 Vector Creations Ltd
-Copyright 2017-2019 New Vector Ltd
-Copyright 2019, 2020 The Matrix.org Foundation C.I.C.
+Copyright 2015-2021 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.
@@ -18,8 +15,7 @@ limitations under the License.
 */
 
 import React, { createRef } from 'react';
-// @ts-ignore - XXX: no idea why this import fails
-import * as Matrix from "matrix-js-sdk";
+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";
@@ -48,7 +44,7 @@ import * as Lifecycle from '../../Lifecycle';
 import '../../stores/LifecycleStore';
 import PageTypes from '../../PageTypes';
 
-import createRoom from "../../createRoom";
+import createRoom, {IOpts} from "../../createRoom";
 import {_t, _td, getCurrentLanguage} from '../../languageHandler';
 import SettingsStore from "../../settings/SettingsStore";
 import ThemeController from "../../settings/controllers/ThemeController";
@@ -82,6 +78,13 @@ import {UIFeature} from "../../settings/UIFeature";
 import { CommunityPrototypeStore } from "../../stores/CommunityPrototypeStore";
 import DialPadModal from "../views/voip/DialPadModal";
 import { showToast as showMobileGuideToast } from '../../toasts/MobileGuideToast';
+import { shouldUseLoginForWelcome } from "../../utils/pages";
+import SpaceStore from "../../stores/SpaceStore";
+import {replaceableComponent} from "../../utils/replaceableComponent";
+import RoomListStore from "../../stores/room-list/RoomListStore";
+import {RoomUpdateCause} from "../../stores/room-list/models";
+import defaultDispatcher from "../../dispatcher/dispatcher";
+import SecurityCustomisations from "../../customisations/Security";
 
 /** constants for MatrixChat.state.view */
 export enum Views {
@@ -144,6 +147,8 @@ interface IRoomInfo {
     oob_data?: object;
     via_servers?: string[];
     threepid_invite?: IThreepidInvite;
+
+    justCreatedOpts?: IOpts;
 }
 /* eslint-enable camelcase */
 
@@ -198,11 +203,12 @@ interface IState {
     ready: boolean;
     threepidInvite?: IThreepidInvite,
     roomOobData?: object;
-    viaServers?: string[];
     pendingInitialSync?: boolean;
     justRegistered?: boolean;
+    roomJustCreatedOpts?: IOpts;
 }
 
+@replaceableComponent("structures.MatrixChat")
 export default class MatrixChat extends React.PureComponent<IProps, IState> {
     static displayName = "MatrixChat";
 
@@ -390,7 +396,11 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
 
         const crossSigningIsSetUp = cli.getStoredCrossSigningForUser(cli.getUserId());
         if (crossSigningIsSetUp) {
-            this.setStateForNewView({ view: Views.COMPLETE_SECURITY });
+            if (SecurityCustomisations.SHOW_ENCRYPTION_SETUP_UI === false) {
+                this.onLoggedIn();
+            } else {
+                this.setStateForNewView({view: Views.COMPLETE_SECURITY});
+            }
         } else if (await cli.doesServerSupportUnstableFeature("org.matrix.e2e_cross_signing")) {
             this.setStateForNewView({ view: Views.E2E_SETUP });
         } else {
@@ -575,6 +585,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                 }
                 break;
             case 'logout':
+                dis.dispatch({action: "hangup_all"});
                 Lifecycle.logout();
                 break;
             case 'require_registration':
@@ -599,12 +610,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                 if (payload.screenAfterLogin) {
                     this.screenAfterLogin = payload.screenAfterLogin;
                 }
-                this.setStateForNewView({
-                    view: Views.LOGIN,
-                });
-                this.notifyNewScreen('login');
-                ThemeController.isLogin = true;
-                this.themeWatcher.recheck();
+                this.viewLogin();
                 break;
             case 'start_password_recovery':
                 this.setStateForNewView({
@@ -688,10 +694,17 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                 break;
             }
             case Action.ViewRoomDirectory: {
-                const RoomDirectory = sdk.getComponent("structures.RoomDirectory");
-                Modal.createTrackedDialog('Room directory', '', RoomDirectory, {
-                    initialText: payload.initialText,
-                }, 'mx_RoomDirectory_dialogWrapper', false, true);
+                if (SpaceStore.instance.activeSpace) {
+                    defaultDispatcher.dispatch({
+                        action: "view_room",
+                        room_id: SpaceStore.instance.activeSpace.roomId,
+                    });
+                } else {
+                    const RoomDirectory = sdk.getComponent("structures.RoomDirectory");
+                    Modal.createTrackedDialog('Room directory', '', RoomDirectory, {
+                        initialText: payload.initialText,
+                    }, 'mx_RoomDirectory_dialogWrapper', false, true);
+                }
 
                 // View the welcome or home page if we need something to look at
                 this.viewSomethingBehindModal();
@@ -920,8 +933,8 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                 page_type: PageTypes.RoomView,
                 threepidInvite: roomInfo.threepid_invite,
                 roomOobData: roomInfo.oob_data,
-                viaServers: roomInfo.via_servers,
                 ready: true,
+                roomJustCreatedOpts: roomInfo.justCreatedOpts,
             }, () => {
                 this.notifyNewScreen('room/' + presentedId, replaceLast);
             });
@@ -960,6 +973,9 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
     }
 
     private viewWelcome() {
+        if (shouldUseLoginForWelcome(SdkConfig.get())) {
+            return this.viewLogin();
+        }
         this.setStateForNewView({
             view: Views.WELCOME,
         });
@@ -968,6 +984,16 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
         this.themeWatcher.recheck();
     }
 
+    private viewLogin(otherState?: any) {
+        this.setStateForNewView({
+            view: Views.LOGIN,
+            ...otherState,
+        });
+        this.notifyNewScreen('login');
+        ThemeController.isLogin = true;
+        this.themeWatcher.recheck();
+    }
+
     private viewHome(justRegistered = false) {
         // The home page requires the "logged in" view, so we'll set that.
         this.setStateForNewView({
@@ -1068,16 +1094,33 @@ 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();
         // Show a warning if there are additional complications.
-        const joinRules = roomToLeave.currentState.getStateEvents('m.room.join_rules', '');
         const warnings = [];
+
+        const memberCount = roomToLeave.currentState.getJoinedMemberCount();
+        if (memberCount === 1) {
+            warnings.push((
+                <span className="warning" key="only_member_warning">
+                    {' '/* 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>
+            ));
+
+            return warnings;
+        }
+
+        const joinRules = roomToLeave.currentState.getStateEvents('m.room.join_rules', '');
         if (joinRules) {
             const rule = joinRules.getContent().join_rule;
             if (rule !== "public") {
                 warnings.push((
                     <span className="warning" key="non_public_warning">
                         {' '/* Whitespace, otherwise the sentences get smashed together */ }
-                        { _t("This room is not public. You will not be able to rejoin without an invite.") }
+                        { 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.") }
                     </span>
                 ));
             }
@@ -1090,11 +1133,14 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
         const roomToLeave = MatrixClientPeg.get().getRoom(roomId);
         const warnings = this.leaveRoomWarnings(roomId);
 
-        Modal.createTrackedDialog('Leave room', '', QuestionDialog, {
-            title: _t("Leave room"),
+        const isSpace = SettingsStore.getValue("feature_spaces") && roomToLeave?.isSpaceRoom();
+        Modal.createTrackedDialog(isSpace ? "Leave space" : "Leave room", '', QuestionDialog, {
+            title: isSpace ? _t("Leave space") : _t("Leave room"),
             description: (
                 <span>
-                    { _t("Are you sure you want to leave the room '%(roomName)s'?", {roomName: roomToLeave.name}) }
+                    { isSpace
+                        ? _t("Are you sure you want to leave the space '%(spaceName)s'?", {spaceName: roomToLeave.name})
+                        : _t("Are you sure you want to leave the room '%(roomName)s'?", {roomName: roomToLeave.name}) }
                     { warnings }
                 </span>
             ),
@@ -1108,17 +1154,27 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                     const modal = Modal.createDialog(Loader, null, 'mx_Dialog_spinner');
 
                     d.finally(() => modal.close());
+                    dis.dispatch({
+                        action: "after_leave_room",
+                        room_id: roomId,
+                    });
                 }
             },
         });
     }
 
     private forgetRoom(roomId: string) {
+        const room = MatrixClientPeg.get().getRoom(roomId);
         MatrixClientPeg.get().forget(roomId).then(() => {
             // Switch to home page if we're currently viewing the forgotten room
             if (this.state.currentRoomId === roomId) {
                 dis.dispatch({ action: "view_home_page" });
             }
+
+            // We have to manually update the room list because the forgotten room will not
+            // be notified to us, therefore the room list will have no other way of knowing
+            // the room is forgotten.
+            RoomListStore.instance.manualRoomUpdate(room, RoomUpdateCause.RoomRemoved);
         }).catch((err) => {
             const errCode = err.errcode || _td("unknown error code");
             Modal.createTrackedDialog("Failed to forget room", '', ErrorDialog, {
@@ -1273,17 +1329,13 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
      * Called when the session is logged out
      */
     private onLoggedOut() {
-        this.notifyNewScreen('login');
-        this.setStateForNewView({
-            view: Views.LOGIN,
+        this.viewLogin({
             ready: false,
             collapseLhs: false,
             currentRoomId: null,
         });
         this.subTitleStatus = '';
         this.setPageSubtitle();
-        ThemeController.isLogin = true;
-        this.themeWatcher.recheck();
     }
 
     /**
@@ -1521,7 +1573,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
             } else if (request.pending) {
                 ToastStore.sharedInstance().addOrReplaceToast({
                     key: 'verifreq_' + request.channel.transactionId,
-                    title: request.isSelfVerification ? _t("Self-verification request") : _t("Verification Request"),
+                    title: _t("Verification requested"),
                     icon: "verification",
                     props: {request},
                     component: sdk.getComponent("toasts.VerificationRequestToast"),
@@ -1623,7 +1675,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
             let cli = MatrixClientPeg.get();
             if (!cli) {
                 const {hsUrl, isUrl} = this.props.serverConfig;
-                cli = Matrix.createClient({
+                cli = createClient({
                     baseUrl: hsUrl,
                     idBaseUrl: isUrl,
                 });

src/components/structures/MessagePanel.js

@@ -23,7 +23,6 @@ import classNames from 'classnames';
 import shouldHideEvent from '../../shouldHideEvent';
 import {wantsDateSeparator} from '../../DateUtils';
 import * as sdk from '../../index';
-import dis from "../../dispatcher/dispatcher";
 
 import {MatrixClientPeg} from '../../MatrixClientPeg';
 import SettingsStore from '../../settings/SettingsStore';
@@ -34,6 +33,7 @@ import {textForEvent} from "../../TextForEvent";
 import IRCTimelineProfileResizer from "../views/elements/IRCTimelineProfileResizer";
 import DMRoomMap from "../../utils/DMRoomMap";
 import NewRoomIntro from "../views/rooms/NewRoomIntro";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 const CONTINUATION_MAX_INTERVAL = 5 * 60 * 1000; // 5 minutes
 const continuedTypes = ['m.sticker', 'm.room.message'];
@@ -46,6 +46,9 @@ function shouldFormContinuation(prevEvent, mxEvent) {
     // check if within the max continuation period
     if (mxEvent.getTs() - prevEvent.getTs() > CONTINUATION_MAX_INTERVAL) return false;
 
+    // As we summarise redactions, do not continue a redacted event onto a non-redacted one and vice-versa
+    if (mxEvent.isRedacted() !== prevEvent.isRedacted()) return false;
+
     // Some events should appear as continuations from previous events of different types.
     if (mxEvent.getType() !== prevEvent.getType() &&
         (!continuedTypes.includes(mxEvent.getType()) ||
@@ -66,6 +69,7 @@ const isMembershipChange = (e) => e.getType() === 'm.room.member' || e.getType()
 
 /* (almost) stateless UI component which builds the event tiles in the room timeline.
  */
+@replaceableComponent("structures.MessagePanel")
 export default class MessagePanel extends React.Component {
     static propTypes = {
         // true to give the component a 'display: none' style.
@@ -208,13 +212,11 @@ export default class MessagePanel extends React.Component {
 
     componentDidMount() {
         this._isMounted = true;
-        this.dispatcherRef = dis.register(this.onAction);
     }
 
     componentWillUnmount() {
         this._isMounted = false;
         SettingsStore.unwatchSetting(this._showTypingNotificationsWatcherRef);
-        dis.unregister(this.dispatcherRef);
     }
 
     componentDidUpdate(prevProps, prevState) {
@@ -227,14 +229,6 @@ export default class MessagePanel extends React.Component {
         }
     }
 
-    onAction = (payload) => {
-        switch (payload.action) {
-            case "scroll_to_bottom":
-                this.scrollToBottom();
-                break;
-        }
-    }
-
     onShowTypingNotificationsChange = () => {
         this.setState({
             showTypingNotifications: SettingsStore.getValue("showTypingNotifications"),
@@ -433,8 +427,10 @@ export default class MessagePanel extends React.Component {
             // we get a new DOM node (restarting the animation) when the ghost
             // moves to a different event.
             return (
-                <li key={"_readuptoghost_"+eventId}
-                      className="mx_RoomView_myReadMarker_container">
+                <li
+                    key={"_readuptoghost_"+eventId}
+                    className="mx_RoomView_myReadMarker_container"
+                >
                     { hr }
                 </li>
             );
@@ -461,6 +457,20 @@ export default class MessagePanel extends React.Component {
         });
     };
 
+    _getNextEventInfo(arr, i) {
+        const nextEvent = i < arr.length - 1
+            ? arr[i + 1]
+            : null;
+
+        // The next event with tile is used to to determine the 'last successful' flag
+        // when rendering the tile. The shouldShowEvent function is pretty quick at what
+        // it does, so this should have no significant cost even when a room is used for
+        // not-chat purposes.
+        const nextTile = arr.slice(i + 1).find(e => this._shouldShowEvent(e));
+
+        return {nextEvent, nextTile};
+    }
+
     _getEventTiles() {
         this.eventNodes = {};
 
@@ -498,6 +508,9 @@ export default class MessagePanel extends React.Component {
 
         let prevEvent = null; // the last event we showed
 
+        // Note: the EventTile might still render a "sent/sending receipt" independent of
+        // this information. When not providing read receipt information, the tile is likely
+        // to assume that sent receipts are to be shown more often.
         this._readReceiptsByEvent = {};
         if (this.props.showReadReceipts) {
             this._readReceiptsByEvent = this._getReadReceiptsByShownEvent();
@@ -509,6 +522,7 @@ export default class MessagePanel extends React.Component {
             const mxEv = this.props.events[i];
             const eventId = mxEv.getId();
             const last = (mxEv === lastShownEvent);
+            const {nextEvent, nextTile} = this._getNextEventInfo(this.props.events, i);
 
             if (grouper) {
                 if (grouper.shouldGroup(mxEv)) {
@@ -525,19 +539,18 @@ export default class MessagePanel extends React.Component {
 
             for (const Grouper of groupers) {
                 if (Grouper.canStartGroup(this, mxEv)) {
-                    grouper = new Grouper(this, mxEv, prevEvent, lastShownEvent);
+                    grouper = new Grouper(this, mxEv, prevEvent, lastShownEvent, nextEvent, nextTile);
                 }
             }
             if (!grouper) {
                 const wantTile = this._shouldShowEvent(mxEv);
+                const isGrouped = false;
                 if (wantTile) {
-                    const nextEvent = i < this.props.events.length - 1
-                        ? this.props.events[i + 1]
-                        : null;
                     // make sure we unpack the array returned by _getTilesForEvent,
                     // otherwise react will auto-generate keys and we will end up
                     // replacing all of the DOM elements every time we paginate.
-                    ret.push(...this._getTilesForEvent(prevEvent, mxEv, last, nextEvent));
+                    ret.push(...this._getTilesForEvent(prevEvent, mxEv, last, isGrouped,
+                        nextEvent, nextTile));
                     prevEvent = mxEv;
                 }
 
@@ -553,7 +566,7 @@ export default class MessagePanel extends React.Component {
         return ret;
     }
 
-    _getTilesForEvent(prevEvent, mxEv, last, nextEvent) {
+    _getTilesForEvent(prevEvent, mxEv, last, isGrouped=false, nextEvent, nextEventWithTile) {
         const TileErrorBoundary = sdk.getComponent('messages.TileErrorBoundary');
         const EventTile = sdk.getComponent('rooms.EventTile');
         const DateSeparator = sdk.getComponent('messages.DateSeparator');
@@ -573,7 +586,7 @@ export default class MessagePanel extends React.Component {
 
         // do we need a date separator since the last event?
         const wantsDateSeparator = this._wantsDateSeparator(prevEvent, eventDate);
-        if (wantsDateSeparator) {
+        if (wantsDateSeparator && !isGrouped) {
             const dateSeparator = <li key={ts1}><DateSeparator key={ts1} ts={ts1} /></li>;
             ret.push(dateSeparator);
         }
@@ -595,6 +608,30 @@ export default class MessagePanel extends React.Component {
 
         const readReceipts = this._readReceiptsByEvent[eventId];
 
+        let isLastSuccessful = false;
+        const isSentState = s => !s || s === 'sent';
+        const isSent = isSentState(mxEv.getAssociatedStatus());
+        const hasNextEvent = nextEvent && this._shouldShowEvent(nextEvent);
+        if (!hasNextEvent && isSent) {
+            isLastSuccessful = true;
+        } else if (hasNextEvent && isSent && !isSentState(nextEvent.getAssociatedStatus())) {
+            isLastSuccessful = true;
+        }
+
+        // This is a bit nuanced, but if our next event is hidden but a future event is not
+        // hidden then we're not the last successful.
+        if (
+            nextEventWithTile &&
+            nextEventWithTile !== nextEvent &&
+            isSentState(nextEventWithTile.getAssociatedStatus())
+        ) {
+            isLastSuccessful = false;
+        }
+
+        // We only want to consider "last successful" if the event is sent by us, otherwise of course
+        // it's successful: we received it.
+        isLastSuccessful = isLastSuccessful && mxEv.getSender() === MatrixClientPeg.get().getUserId();
+
         // use txnId as key if available so that we don't remount during sending
         ret.push(
             <li
@@ -620,11 +657,13 @@ export default class MessagePanel extends React.Component {
                         permalinkCreator={this.props.permalinkCreator}
                         last={last}
                         lastInSection={willWantDateSeparator}
+                        lastSuccessful={isLastSuccessful}
                         isSelectedEvent={highlight}
                         getRelationsForEvent={this.props.getRelationsForEvent}
                         showReactions={this.props.showReactions}
                         layout={this.props.layout}
                         enableFlair={this.props.enableFlair}
+                        showReadReceipts={this.props.showReadReceipts}
                     />
                 </TileErrorBoundary>
             </li>,
@@ -931,9 +970,9 @@ class CreationGrouper {
 
         const DateSeparator = sdk.getComponent('messages.DateSeparator');
         const EventListSummary = sdk.getComponent('views.elements.EventListSummary');
-
         const panel = this.panel;
         const ret = [];
+        const isGrouped = true;
         const createEvent = this.createEvent;
         const lastShownEvent = this.lastShownEvent;
 
@@ -947,12 +986,12 @@ class CreationGrouper {
         // If this m.room.create event should be shown (room upgrade) then show it before the summary
         if (panel._shouldShowEvent(createEvent)) {
             // pass in the createEvent as prevEvent as well so no extra DateSeparator is rendered
-            ret.push(...panel._getTilesForEvent(createEvent, createEvent, false));
+            ret.push(...panel._getTilesForEvent(createEvent, createEvent));
         }
 
         for (const ejected of this.ejectedEvents) {
             ret.push(...panel._getTilesForEvent(
-                createEvent, ejected, createEvent === lastShownEvent,
+                createEvent, ejected, createEvent === lastShownEvent, isGrouped,
             ));
         }
 
@@ -961,7 +1000,7 @@ class CreationGrouper {
             // of EventListSummary, render each member event as if the previous
             // one was itself. This way, the timestamp of the previous event === the
             // timestamp of the current event, and no DateSeparator is inserted.
-            return panel._getTilesForEvent(e, e, e === lastShownEvent);
+            return panel._getTilesForEvent(e, e, e === lastShownEvent, isGrouped);
         }).reduce((a, b) => a.concat(b), []);
         // Get sender profile from the latest event in the summary as the m.room.create doesn't contain one
         const ev = this.events[this.events.length - 1];
@@ -979,13 +1018,13 @@ class CreationGrouper {
 
         ret.push(
             <EventListSummary
-                 key="roomcreationsummary"
-                 events={this.events}
-                 onToggle={panel._onHeightChanged} // Update scroll state
-                 summaryMembers={[ev.sender]}
-                 summaryText={summaryText}
+                key="roomcreationsummary"
+                events={this.events}
+                onToggle={panel._onHeightChanged} // Update scroll state
+                summaryMembers={[ev.sender]}
+                summaryText={summaryText}
             >
-                 { eventTiles }
+                { eventTiles }
             </EventListSummary>,
         );
 
@@ -1001,6 +1040,104 @@ class CreationGrouper {
     }
 }
 
+class RedactionGrouper {
+    static canStartGroup = function(panel, ev) {
+        return panel._shouldShowEvent(ev) && ev.isRedacted();
+    }
+
+    constructor(panel, ev, prevEvent, lastShownEvent, nextEvent, nextEventTile) {
+        this.panel = panel;
+        this.readMarker = panel._readMarkerForEvent(
+            ev.getId(),
+            ev === lastShownEvent,
+        );
+        this.events = [ev];
+        this.prevEvent = prevEvent;
+        this.lastShownEvent = lastShownEvent;
+        this.nextEvent = nextEvent;
+        this.nextEventTile = nextEventTile;
+    }
+
+    shouldGroup(ev) {
+        // absorb hidden events so that they do not break up streams of messages & redaction events being grouped
+        if (!this.panel._shouldShowEvent(ev)) {
+            return true;
+        }
+        if (this.panel._wantsDateSeparator(this.events[0], ev.getDate())) {
+            return false;
+        }
+        return ev.isRedacted();
+    }
+
+    add(ev) {
+        this.readMarker = this.readMarker || this.panel._readMarkerForEvent(
+            ev.getId(),
+            ev === this.lastShownEvent,
+        );
+        if (!this.panel._shouldShowEvent(ev)) {
+            return;
+        }
+        this.events.push(ev);
+    }
+
+    getTiles() {
+        if (!this.events || !this.events.length) return [];
+
+        const DateSeparator = sdk.getComponent('messages.DateSeparator');
+        const EventListSummary = sdk.getComponent('views.elements.EventListSummary');
+        const isGrouped = true;
+        const panel = this.panel;
+        const ret = [];
+        const lastShownEvent = this.lastShownEvent;
+
+        if (panel._wantsDateSeparator(this.prevEvent, this.events[0].getDate())) {
+            const ts = this.events[0].getTs();
+            ret.push(
+                <li key={ts+'~'}><DateSeparator key={ts+'~'} ts={ts} /></li>,
+            );
+        }
+
+        const key = "redactioneventlistsummary-" + (
+            this.prevEvent ? this.events[0].getId() : "initial"
+        );
+
+        const senders = new Set();
+        let eventTiles = this.events.map((e, i) => {
+            senders.add(e.sender);
+            const prevEvent = i === 0 ? this.prevEvent : this.events[i - 1];
+            return panel._getTilesForEvent(
+                prevEvent, e, e === lastShownEvent, isGrouped, this.nextEvent, this.nextEventTile);
+        }).reduce((a, b) => a.concat(b), []);
+
+        if (eventTiles.length === 0) {
+            eventTiles = null;
+        }
+
+        ret.push(
+            <EventListSummary
+                key={key}
+                threshold={2}
+                events={this.events}
+                onToggle={panel._onHeightChanged} // Update scroll state
+                summaryMembers={Array.from(senders)}
+                summaryText={_t("%(count)s messages deleted.", { count: eventTiles.length })}
+            >
+                { eventTiles }
+            </EventListSummary>,
+        );
+
+        if (this.readMarker) {
+            ret.push(this.readMarker);
+        }
+
+        return ret;
+    }
+
+    getNewPrevEvent() {
+        return this.events[this.events.length - 1];
+    }
+}
+
 // Wrap consecutive member events in a ListSummary, ignore if redacted
 class MemberGrouper {
     static canStartGroup = function(panel, ev) {
@@ -1048,7 +1185,7 @@ class MemberGrouper {
 
         const DateSeparator = sdk.getComponent('messages.DateSeparator');
         const MemberEventListSummary = sdk.getComponent('views.elements.MemberEventListSummary');
-
+        const isGrouped = true;
         const panel = this.panel;
         const lastShownEvent = this.lastShownEvent;
         const ret = [];
@@ -1081,7 +1218,7 @@ class MemberGrouper {
             // of MemberEventListSummary, render each member event as if the previous
             // one was itself. This way, the timestamp of the previous event === the
             // timestamp of the current event, and no DateSeparator is inserted.
-            return panel._getTilesForEvent(e, e, e === lastShownEvent);
+            return panel._getTilesForEvent(e, e, e === lastShownEvent, isGrouped);
         }).reduce((a, b) => a.concat(b), []);
 
         if (eventTiles.length === 0) {
@@ -1090,11 +1227,11 @@ class MemberGrouper {
 
         ret.push(
             <MemberEventListSummary key={key}
-                 events={this.events}
-                 onToggle={panel._onHeightChanged} // Update scroll state
-                 startExpanded={highlightInMels}
+                events={this.events}
+                onToggle={panel._onHeightChanged} // Update scroll state
+                startExpanded={highlightInMels}
             >
-                 { eventTiles }
+                { eventTiles }
             </MemberEventListSummary>,
         );
 
@@ -1111,4 +1248,4 @@ class MemberGrouper {
 }
 
 // all the grouper classes that we use
-const groupers = [CreationGrouper, MemberGrouper];
+const groupers = [CreationGrouper, MemberGrouper, RedactionGrouper];

src/components/structures/MyGroups.js

@@ -24,7 +24,9 @@ import dis from '../../dispatcher/dispatcher';
 import AccessibleButton from '../views/elements/AccessibleButton';
 import MatrixClientContext from "../../contexts/MatrixClientContext";
 import AutoHideScrollbar from "./AutoHideScrollbar";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
+@replaceableComponent("structures.MyGroups")
 export default class MyGroups extends React.Component {
     static contextType = MatrixClientContext;
 

src/components/structures/NonUrgentToastContainer.tsx

@@ -18,6 +18,7 @@ import * as React from "react";
 import { ComponentClass } from "../../@types/common";
 import NonUrgentToastStore from "../../stores/NonUrgentToastStore";
 import { UPDATE_EVENT } from "../../stores/AsyncStore";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 interface IProps {
 }
@@ -26,6 +27,7 @@ interface IState {
     toasts: ComponentClass[],
 }
 
+@replaceableComponent("structures.NonUrgentToastContainer")
 export default class NonUrgentToastContainer extends React.PureComponent<IProps, IState> {
     public constructor(props, context) {
         super(props, context);

src/components/structures/NotificationPanel.js

@@ -23,10 +23,12 @@ import { _t } from '../../languageHandler';
 import {MatrixClientPeg} from "../../MatrixClientPeg";
 import * as sdk from "../../index";
 import BaseCard from "../views/right_panel/BaseCard";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 /*
  * Component which shows the global notification list using a TimelinePanel
  */
+@replaceableComponent("structures.NotificationPanel")
 class NotificationPanel extends React.Component {
     static propTypes = {
         onClose: PropTypes.func.isRequired,

src/components/structures/RightPanel.js

@@ -24,13 +24,20 @@ import dis from '../../dispatcher/dispatcher';
 import RateLimitedFunc from '../../ratelimitedfunc';
 import { showGroupInviteDialog, showGroupAddRoomDialog } from '../../GroupAddressPicker';
 import GroupStore from '../../stores/GroupStore';
-import {RightPanelPhases, RIGHT_PANEL_PHASES_NO_ARGS} from "../../stores/RightPanelStorePhases";
+import {
+    RightPanelPhases,
+    RIGHT_PANEL_PHASES_NO_ARGS,
+    RIGHT_PANEL_SPACE_PHASES,
+} from "../../stores/RightPanelStorePhases";
 import RightPanelStore from "../../stores/RightPanelStore";
 import MatrixClientContext from "../../contexts/MatrixClientContext";
 import {Action} from "../../dispatcher/actions";
 import RoomSummaryCard from "../views/right_panel/RoomSummaryCard";
 import WidgetCard from "../views/right_panel/WidgetCard";
+import {replaceableComponent} from "../../utils/replaceableComponent";
+import SettingsStore from "../../settings/SettingsStore";
 
+@replaceableComponent("structures.RightPanel")
 export default class RightPanel extends React.Component {
     static get propTypes() {
         return {
@@ -79,6 +86,10 @@ export default class RightPanel extends React.Component {
                 return RightPanelPhases.GroupMemberList;
             }
             return rps.groupPanelPhase;
+        } else if (SettingsStore.getValue("feature_spaces") && this.props.room?.isSpaceRoom()
+            && !RIGHT_PANEL_SPACE_PHASES.includes(rps.roomPanelPhase)
+        ) {
+            return RightPanelPhases.SpaceMemberList;
         } else if (userForPanel) {
             // XXX FIXME AAAAAARGH: What is going on with this class!? It takes some of its state
             // from its props and some from a store, except if the contents of the store changes
@@ -99,9 +110,8 @@ export default class RightPanel extends React.Component {
                 return rps.roomPanelPhase;
             }
             return RightPanelPhases.RoomMemberInfo;
-        } else {
-            return rps.roomPanelPhase;
         }
+        return rps.roomPanelPhase;
     }
 
     componentDidMount() {
@@ -181,6 +191,7 @@ export default class RightPanel extends React.Component {
                 verificationRequest: payload.verificationRequest,
                 verificationRequestPromise: payload.verificationRequestPromise,
                 widgetId: payload.widgetId,
+                space: payload.space,
             });
         }
     }
@@ -232,6 +243,13 @@ export default class RightPanel extends React.Component {
                     panel = <MemberList roomId={roomId} key={roomId} onClose={this.onClose} />;
                 }
                 break;
+            case RightPanelPhases.SpaceMemberList:
+                panel = <MemberList
+                    roomId={this.state.space ? this.state.space.roomId : roomId}
+                    key={this.state.space ? this.state.space.roomId : roomId}
+                    onClose={this.onClose}
+                />;
+                break;
 
             case RightPanelPhases.GroupMemberList:
                 if (this.props.groupId) {
@@ -244,10 +262,11 @@ export default class RightPanel extends React.Component {
                 break;
 
             case RightPanelPhases.RoomMemberInfo:
+            case RightPanelPhases.SpaceMemberInfo:
             case RightPanelPhases.EncryptionPanel:
                 panel = <UserInfo
                     user={this.state.member}
-                    room={this.props.room}
+                    room={this.state.phase === RightPanelPhases.SpaceMemberInfo ? this.state.space : this.props.room}
                     key={roomId || this.state.member.userId}
                     onClose={this.onClose}
                     phase={this.state.phase}
@@ -257,6 +276,7 @@ export default class RightPanel extends React.Component {
                 break;
 
             case RightPanelPhases.Room3pidMemberInfo:
+            case RightPanelPhases.Space3pidMemberInfo:
                 panel = <ThirdPartyMemberInfo event={this.state.event} key={roomId} />;
                 break;
 

src/components/structures/RoomDirectory.js

@@ -27,13 +27,14 @@ import { _t } from '../../languageHandler';
 import SdkConfig from '../../SdkConfig';
 import { instanceForInstanceId, protocolNameForInstanceId } from '../../utils/DirectoryUtils';
 import Analytics from '../../Analytics';
-import {getHttpUriForMxc} from "matrix-js-sdk/src/content-repo";
 import {ALL_ROOMS} from "../views/directory/NetworkDropdown";
 import SettingsStore from "../../settings/SettingsStore";
 import GroupFilterOrderStore from "../../stores/GroupFilterOrderStore";
 import GroupStore from "../../stores/GroupStore";
 import FlairStore from "../../stores/FlairStore";
 import CountlyAnalytics from "../../CountlyAnalytics";
+import {replaceableComponent} from "../../utils/replaceableComponent";
+import {mediaFromMxc} from "../../customisations/Media";
 
 const MAX_NAME_LENGTH = 80;
 const MAX_TOPIC_LENGTH = 800;
@@ -42,6 +43,7 @@ function track(action) {
     Analytics.trackEvent('RoomDirectory', action);
 }
 
+@replaceableComponent("structures.RoomDirectory")
 export default class RoomDirectory extends React.Component {
     static propTypes = {
         initialText: PropTypes.string,
@@ -519,10 +521,9 @@ export default class RoomDirectory extends React.Component {
             topic = `${topic.substring(0, MAX_TOPIC_LENGTH)}...`;
         }
         topic = linkifyAndSanitizeHtml(topic);
-        const avatarUrl = getHttpUriForMxc(
-                                MatrixClientPeg.get().getHomeserverUrl(),
-                                room.avatar_url, 32, 32, "crop",
-                            );
+        let avatarUrl = null;
+        if (room.avatar_url) avatarUrl = mediaFromMxc(room.avatar_url).getSquareThumbnailHttp(32);
+
         return [
             <div key={ `${room.room_id}_avatar` }
                 onClick={(ev) => this.onRoomClicked(room, ev)}

src/components/structures/RoomSearch.tsx

@@ -1,5 +1,5 @@
 /*
-Copyright 2020 The Matrix.org Foundation C.I.C.
+Copyright 2020, 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.
@@ -17,26 +17,35 @@ limitations under the License.
 import * as React from "react";
 import { createRef } from "react";
 import classNames from "classnames";
+import { Room } from "matrix-js-sdk/src/models/room";
+
 import defaultDispatcher from "../../dispatcher/dispatcher";
 import { _t } from "../../languageHandler";
 import { ActionPayload } from "../../dispatcher/payloads";
-import { Key } from "../../Keyboard";
 import AccessibleButton from "../views/elements/AccessibleButton";
 import { Action } from "../../dispatcher/actions";
 import RoomListStore from "../../stores/room-list/RoomListStore";
 import { NameFilterCondition } from "../../stores/room-list/filters/NameFilterCondition";
+import { getKeyBindingsManager, RoomListAction } from "../../KeyBindingsManager";
+import { replaceableComponent } from "../../utils/replaceableComponent";
+import SpaceStore, { UPDATE_SELECTED_SPACE, UPDATE_TOP_LEVEL_SPACES } from "../../stores/SpaceStore";
 
 interface IProps {
     isMinimized: boolean;
-    onVerticalArrow(ev: React.KeyboardEvent): void;
-    onEnter(ev: React.KeyboardEvent): boolean;
+    onKeyDown(ev: React.KeyboardEvent): void;
+    /**
+     * @returns true if a room has been selected and the search field should be cleared
+     */
+    onSelectRoom(): boolean;
 }
 
 interface IState {
     query: string;
     focused: boolean;
+    inSpaces: boolean;
 }
 
+@replaceableComponent("structures.RoomSearch")
 export default class RoomSearch extends React.PureComponent<IProps, IState> {
     private dispatcherRef: string;
     private inputRef: React.RefObject<HTMLInputElement> = createRef();
@@ -48,9 +57,13 @@ export default class RoomSearch extends React.PureComponent<IProps, IState> {
         this.state = {
             query: "",
             focused: false,
+            inSpaces: false,
         };
 
         this.dispatcherRef = defaultDispatcher.register(this.onAction);
+        // clear filter when changing spaces, in future we may wish to maintain a filter per-space
+        SpaceStore.instance.on(UPDATE_SELECTED_SPACE, this.clearInput);
+        SpaceStore.instance.on(UPDATE_TOP_LEVEL_SPACES, this.onSpaces);
     }
 
     public componentDidUpdate(prevProps: Readonly<IProps>, prevState: Readonly<IState>): void {
@@ -70,8 +83,16 @@ export default class RoomSearch extends React.PureComponent<IProps, IState> {
 
     public componentWillUnmount() {
         defaultDispatcher.unregister(this.dispatcherRef);
+        SpaceStore.instance.off(UPDATE_SELECTED_SPACE, this.clearInput);
+        SpaceStore.instance.off(UPDATE_TOP_LEVEL_SPACES, this.onSpaces);
     }
 
+    private onSpaces = (spaces: Room[]) => {
+        this.setState({
+            inSpaces: spaces.length > 0,
+        });
+    };
+
     private onAction = (payload: ActionPayload) => {
         if (payload.action === 'view_room' && payload.clear_search) {
             this.clearInput();
@@ -106,18 +127,26 @@ export default class RoomSearch extends React.PureComponent<IProps, IState> {
     };
 
     private onKeyDown = (ev: React.KeyboardEvent) => {
-        if (ev.key === Key.ESCAPE) {
-            this.clearInput();
-            defaultDispatcher.fire(Action.FocusComposer);
-        } else if (ev.key === Key.ARROW_UP || ev.key === Key.ARROW_DOWN) {
-            this.props.onVerticalArrow(ev);
-        } else if (ev.key === Key.ENTER) {
-            const shouldClear = this.props.onEnter(ev);
-            if (shouldClear) {
-                // wrap in set immediate to delay it so that we don't clear the filter & then change room
-                setImmediate(() => {
-                    this.clearInput();
-                });
+        const action = getKeyBindingsManager().getRoomListAction(ev);
+        switch (action) {
+            case RoomListAction.ClearSearch:
+                this.clearInput();
+                defaultDispatcher.fire(Action.FocusComposer);
+                break;
+            case RoomListAction.NextRoom:
+            case RoomListAction.PrevRoom:
+                // we don't handle these actions here put pass the event on to the interested party (LeftPanel)
+                this.props.onKeyDown(ev);
+                break;
+            case RoomListAction.SelectRoom: {
+                const shouldClear = this.props.onSelectRoom();
+                if (shouldClear) {
+                    // wrap in set immediate to delay it so that we don't clear the filter & then change room
+                    setImmediate(() => {
+                        this.clearInput();
+                    });
+                }
+                break;
             }
         }
     };
@@ -135,6 +164,11 @@ export default class RoomSearch extends React.PureComponent<IProps, IState> {
             'mx_RoomSearch_inputExpanded': this.state.query || this.state.focused,
         });
 
+        let placeholder = _t("Filter");
+        if (this.state.inSpaces) {
+            placeholder = _t("Filter all spaces");
+        }
+
         let icon = (
             <div className='mx_RoomSearch_icon' />
         );
@@ -148,7 +182,7 @@ export default class RoomSearch extends React.PureComponent<IProps, IState> {
                 onBlur={this.onBlur}
                 onChange={this.onChange}
                 onKeyDown={this.onKeyDown}
-                placeholder={_t("Filter")}
+                placeholder={placeholder}
                 autoComplete="off"
             />
         );

src/components/structures/RoomStatusBar.js

@@ -1,5 +1,5 @@
 /*
-Copyright 2015-2020 The Matrix.org Foundation C.I.C.
+Copyright 2015-2021 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.
@@ -16,25 +16,31 @@ limitations under the License.
 
 import React from 'react';
 import PropTypes from 'prop-types';
-import Matrix from 'matrix-js-sdk';
 import { _t, _td } from '../../languageHandler';
 import {MatrixClientPeg} from '../../MatrixClientPeg';
 import Resend from '../../Resend';
 import dis from '../../dispatcher/dispatcher';
-import {messageForResourceLimitError, messageForSendError} from '../../utils/ErrorUtils';
+import {messageForResourceLimitError} from '../../utils/ErrorUtils';
 import {Action} from "../../dispatcher/actions";
+import {replaceableComponent} from "../../utils/replaceableComponent";
+import {EventStatus} from "matrix-js-sdk/src/models/event";
+import NotificationBadge from "../views/rooms/NotificationBadge";
+import {StaticNotificationState} from "../../stores/notifications/StaticNotificationState";
+import AccessibleButton from "../views/elements/AccessibleButton";
+import InlineSpinner from "../views/elements/InlineSpinner";
 
 const STATUS_BAR_HIDDEN = 0;
 const STATUS_BAR_EXPANDED = 1;
 const STATUS_BAR_EXPANDED_LARGE = 2;
 
-function getUnsentMessages(room) {
+export function getUnsentMessages(room) {
     if (!room) { return []; }
     return room.getPendingEvents().filter(function(ev) {
-        return ev.status === Matrix.EventStatus.NOT_SENT;
+        return ev.status === EventStatus.NOT_SENT;
     });
 }
 
+@replaceableComponent("structures.RoomStatusBar")
 export default class RoomStatusBar extends React.Component {
     static propTypes = {
         // the room this statusbar is representing.
@@ -74,6 +80,7 @@ export default class RoomStatusBar extends React.Component {
         syncState: MatrixClientPeg.get().getSyncState(),
         syncStateData: MatrixClientPeg.get().getSyncStateData(),
         unsentMessages: getUnsentMessages(this.props.room),
+        isResending: false,
     };
 
     componentDidMount() {
@@ -107,7 +114,10 @@ export default class RoomStatusBar extends React.Component {
     };
 
     _onResendAllClick = () => {
-        Resend.resendUnsentEvents(this.props.room);
+        Resend.resendUnsentEvents(this.props.room).then(() => {
+            this.setState({isResending: false});
+        });
+        this.setState({isResending: true});
         dis.fire(Action.FocusComposer);
     };
 
@@ -118,9 +128,10 @@ export default class RoomStatusBar extends React.Component {
 
     _onRoomLocalEchoUpdated = (event, room, oldEventId, oldStatus) => {
         if (room.roomId !== this.props.room.roomId) return;
-
+        const messages = getUnsentMessages(this.props.room);
         this.setState({
-            unsentMessages: getUnsentMessages(this.props.room),
+            unsentMessages: messages,
+            isResending: messages.length > 0 && this.state.isResending,
         });
     };
 
@@ -139,7 +150,7 @@ export default class RoomStatusBar extends React.Component {
     _getSize() {
         if (this._shouldShowConnectionError()) {
             return STATUS_BAR_EXPANDED;
-        } else if (this.state.unsentMessages.length > 0) {
+        } else if (this.state.unsentMessages.length > 0 || this.state.isResending) {
             return STATUS_BAR_EXPANDED_LARGE;
         }
         return STATUS_BAR_HIDDEN;
@@ -160,7 +171,6 @@ export default class RoomStatusBar extends React.Component {
 
     _getUnsentMessageContent() {
         const unsentMessages = this.state.unsentMessages;
-        if (!unsentMessages.length) return null;
 
         let title;
 
@@ -190,85 +200,92 @@ export default class RoomStatusBar extends React.Component {
         } else if (resourceLimitError) {
             title = messageForResourceLimitError(
                 resourceLimitError.data.limit_type,
-                resourceLimitError.data.admin_contact, {
-                'monthly_active_user': _td(
-                    "Your message wasn't sent because this homeserver has hit its Monthly Active User Limit. " +
-                    "Please <a>contact your service administrator</a> to continue using the service.",
-                ),
-                '': _td(
-                    "Your message wasn't sent because this homeserver has exceeded a resource limit. " +
-                    "Please <a>contact your service administrator</a> to continue using the service.",
-                ),
-            });
-        } else if (
-            unsentMessages.length === 1 &&
-            unsentMessages[0].error &&
-            unsentMessages[0].error.data &&
-            unsentMessages[0].error.data.error
-        ) {
-            title = messageForSendError(unsentMessages[0].error.data) || unsentMessages[0].error.data.error;
+                resourceLimitError.data.admin_contact,
+                {
+                    'monthly_active_user': _td(
+                        "Your message wasn't sent because this homeserver has hit its Monthly Active User Limit. " +
+                        "Please <a>contact your service administrator</a> to continue using the service.",
+                    ),
+                    'hs_disabled': _td(
+                        "Your message wasn't sent because this homeserver has been blocked by it's administrator. " +
+                        "Please <a>contact your service administrator</a> to continue using the service.",
+                    ),
+                    '': _td(
+                        "Your message wasn't sent because this homeserver has exceeded a resource limit. " +
+                        "Please <a>contact your service administrator</a> to continue using the service.",
+                    ),
+                },
+            );
         } else {
-            title = _t('%(count)s of your messages have not been sent.', { count: unsentMessages.length });
+            title = _t('Some of your messages have not been sent');
         }
 
-        const content = _t("%(count)s <resendText>Resend all</resendText> or <cancelText>cancel all</cancelText> " +
-            "now. You can also select individual messages to resend or cancel.",
-            { count: unsentMessages.length },
-            {
-                'resendText': (sub) =>
-                    <a className="mx_RoomStatusBar_resend_link" key="resend" onClick={this._onResendAllClick}>{ sub }</a>,
-                'cancelText': (sub) =>
-                    <a className="mx_RoomStatusBar_resend_link" key="cancel" onClick={this._onCancelAllClick}>{ sub }</a>,
-            },
-        );
+        let buttonRow = <>
+            <AccessibleButton onClick={this._onCancelAllClick} className="mx_RoomStatusBar_unsentCancelAllBtn">
+                {_t("Delete all")}
+            </AccessibleButton>
+            <AccessibleButton onClick={this._onResendAllClick} className="mx_RoomStatusBar_unsentResendAllBtn">
+                {_t("Retry all")}
+            </AccessibleButton>
+        </>;
+        if (this.state.isResending) {
+            buttonRow = <>
+                <InlineSpinner w={20} h={20} />
+                {/* span for css */}
+                <span>{_t("Sending")}</span>
+            </>;
+        }
 
-        return <div className="mx_RoomStatusBar_connectionLostBar">
-            <img src={require("../../../res/img/feather-customised/warning-triangle.svg")} width="24" height="24" title={_t("Warning")} alt="" />
-            <div>
-                <div className="mx_RoomStatusBar_connectionLostBar_title">
-                    { title }
-                </div>
-                <div className="mx_RoomStatusBar_connectionLostBar_desc">
-                    { content }
+        return <>
+            <div className="mx_RoomStatusBar mx_RoomStatusBar_unsentMessages">
+                <div role="alert">
+                    <div className="mx_RoomStatusBar_unsentBadge">
+                        <NotificationBadge
+                            notification={StaticNotificationState.RED_EXCLAMATION}
+                        />
+                    </div>
+                    <div>
+                        <div className="mx_RoomStatusBar_unsentTitle">
+                            { title }
+                        </div>
+                        <div className="mx_RoomStatusBar_unsentDescription">
+                            { _t("You can select all or individual messages to retry or delete") }
+                        </div>
+                    </div>
+                    <div className="mx_RoomStatusBar_unsentButtonBar">
+                        {buttonRow}
+                    </div>
                 </div>
             </div>
-        </div>;
+        </>;
     }
 
-    // return suitable content for the main (text) part of the status bar.
-    _getContent() {
+    render() {
         if (this._shouldShowConnectionError()) {
             return (
-                <div className="mx_RoomStatusBar_connectionLostBar">
-                    <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.') }
-                        </div>
-                        <div className="mx_RoomStatusBar_connectionLostBar_desc">
-                            { _t('Sent messages will be stored until your connection has returned.') }
+                <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="/!\ " />
+                            <div>
+                                <div className="mx_RoomStatusBar_connectionLostBar_title">
+                                    {_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.')}
+                                </div>
+                            </div>
                         </div>
                     </div>
                 </div>
             );
         }
 
-        if (this.state.unsentMessages.length > 0) {
+        if (this.state.unsentMessages.length > 0 || this.state.isResending) {
             return this._getUnsentMessageContent();
         }
 
         return null;
     }
-
-    render() {
-        const content = this._getContent();
-
-        return (
-            <div className="mx_RoomStatusBar">
-                <div role="alert">
-                    { content }
-                </div>
-            </div>
-        );
-    }
 }

src/components/structures/RoomView.tsx

@@ -34,14 +34,12 @@ import ResizeNotifier from '../../utils/ResizeNotifier';
 import ContentMessages from '../../ContentMessages';
 import Modal from '../../Modal';
 import * as sdk from '../../index';
-import CallHandler from '../../CallHandler';
+import CallHandler, { PlaceCallType } from '../../CallHandler';
 import dis from '../../dispatcher/dispatcher';
 import Tinter from '../../Tinter';
 import rateLimitedFunc from '../../ratelimitedfunc';
-import * as ObjectUtils from '../../ObjectUtils';
 import * as Rooms from '../../Rooms';
 import eventSearch, { searchPagination } from '../../Searching';
-import { isOnlyCtrlOrCmdIgnoreShiftKeyEvent, Key } from '../../Keyboard';
 import MainSplit from './MainSplit';
 import RightPanel from './RightPanel';
 import RoomViewStore from '../../stores/RoomViewStore';
@@ -80,6 +78,11 @@ import Notifier from "../../Notifier";
 import { showToast as showNotificationsToast } from "../../toasts/DesktopNotificationsToast";
 import { RoomNotificationStateStore } from "../../stores/notifications/RoomNotificationStateStore";
 import { Container, WidgetLayoutStore } from "../../stores/widgets/WidgetLayoutStore";
+import { getKeyBindingsManager, RoomAction } from '../../KeyBindingsManager';
+import { objectHasDiff } from "../../utils/objects";
+import SpaceRoomView from "./SpaceRoomView";
+import { IOpts } from "../../createRoom";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 const DEBUG = false;
 let debuglog = function(msg: string) {};
@@ -109,11 +112,8 @@ interface IProps {
         inviterName?: string;
     };
 
-    // Servers the RoomView can use to try and assist joins
-    viaServers?: string[];
-
-    autoJoin?: boolean;
     resizeNotifier: ResizeNotifier;
+    justCreatedOpts?: IOpts;
 
     // Called with the credentials of a registered user (if they were a ROU that transitioned to PWLU)
     onRegistered?(credentials: IMatrixClientCreds): void;
@@ -189,8 +189,13 @@ export interface IState {
     rejecting?: boolean;
     rejectError?: Error;
     hasPinnedWidgets?: boolean;
+    dragCounter: number;
+    // whether or not a spaces context switch brought us here,
+    // if it did we don't want the room to be marked as read as soon as it is loaded.
+    wasContextSwitch?: boolean;
 }
 
+@replaceableComponent("structures.RoomView")
 export default class RoomView extends React.Component<IProps, IState> {
     private readonly dispatcherRef: string;
     private readonly roomStoreToken: EventSubscription;
@@ -239,6 +244,7 @@ export default class RoomView extends React.Component<IProps, IState> {
             canReply: false,
             layout: SettingsStore.getValue("layout"),
             matrixClientIsReady: this.context && this.context.isInitialSyncComplete(),
+            dragCounter: 0,
         };
 
         this.dispatcherRef = dis.register(this.onAction);
@@ -323,6 +329,7 @@ export default class RoomView extends React.Component<IProps, IState> {
             shouldPeek: this.state.matrixClientIsReady && RoomViewStore.shouldPeek(),
             showingPinned: SettingsStore.getValue("PinnedEvents.isOpen", roomId),
             showReadReceipts: SettingsStore.getValue("showReadReceipts", roomId),
+            wasContextSwitch: RoomViewStore.getWasContextSwitch(),
         };
 
         if (!initial && this.state.shouldPeek && !newState.shouldPeek) {
@@ -443,9 +450,7 @@ export default class RoomView extends React.Component<IProps, IState> {
         // now not joined because the js-sdk peeking API will clobber our historical room,
         // making it impossible to indicate a newly joined room.
         if (!joining && roomId) {
-            if (this.props.autoJoin) {
-                this.onJoinButtonClicked();
-            } else if (!room && shouldPeek) {
+            if (!room && shouldPeek) {
                 console.info("Attempting to peek into room %s", roomId);
                 this.setState({
                     peekLoading: true,
@@ -523,8 +528,7 @@ export default class RoomView extends React.Component<IProps, IState> {
     }
 
     shouldComponentUpdate(nextProps, nextState) {
-        return (!ObjectUtils.shallowEqual(this.props, nextProps) ||
-                !ObjectUtils.shallowEqual(this.state, nextState));
+        return (objectHasDiff(this.props, nextProps) || objectHasDiff(this.state, nextState));
     }
 
     componentDidUpdate() {
@@ -533,8 +537,8 @@ export default class RoomView extends React.Component<IProps, IState> {
             if (!roomView.ondrop) {
                 roomView.addEventListener('drop', this.onDrop);
                 roomView.addEventListener('dragover', this.onDragOver);
-                roomView.addEventListener('dragleave', this.onDragLeaveOrEnd);
-                roomView.addEventListener('dragend', this.onDragLeaveOrEnd);
+                roomView.addEventListener('dragenter', this.onDragEnter);
+                roomView.addEventListener('dragleave', this.onDragLeave);
             }
         }
 
@@ -578,8 +582,8 @@ export default class RoomView extends React.Component<IProps, IState> {
             const roomView = this.roomView.current;
             roomView.removeEventListener('drop', this.onDrop);
             roomView.removeEventListener('dragover', this.onDragOver);
-            roomView.removeEventListener('dragleave', this.onDragLeaveOrEnd);
-            roomView.removeEventListener('dragend', this.onDragLeaveOrEnd);
+            roomView.removeEventListener('dragenter', this.onDragEnter);
+            roomView.removeEventListener('dragleave', this.onDragLeave);
         }
         dis.unregister(this.dispatcherRef);
         if (this.context) {
@@ -662,26 +666,20 @@ export default class RoomView extends React.Component<IProps, IState> {
     private onReactKeyDown = ev => {
         let handled = false;
 
-        switch (ev.key) {
-            case Key.ESCAPE:
-                if (!ev.altKey && !ev.ctrlKey && !ev.shiftKey && !ev.metaKey) {
-                    this.messagePanel.forgetReadMarker();
-                    this.jumpToLiveTimeline();
-                    handled = true;
-                }
+        const action = getKeyBindingsManager().getRoomAction(ev);
+        switch (action) {
+            case RoomAction.DismissReadMarker:
+                this.messagePanel.forgetReadMarker();
+                this.jumpToLiveTimeline();
+                handled = true;
                 break;
-            case Key.PAGE_UP:
-                if (!ev.altKey && !ev.ctrlKey && ev.shiftKey && !ev.metaKey) {
-                    this.jumpToReadMarker();
-                    handled = true;
-                }
+            case RoomAction.JumpToOldestUnread:
+                this.jumpToReadMarker();
+                handled = true;
                 break;
-            case Key.U: // Mac returns lowercase
-            case Key.U.toUpperCase():
-                if (isOnlyCtrlOrCmdIgnoreShiftKeyEvent(ev) && ev.shiftKey) {
-                    dis.dispatch({ action: "upload_file" }, true);
-                    handled = true;
-                }
+            case RoomAction.UploadFile:
+                dis.dispatch({ action: "upload_file" }, true);
+                handled = true;
                 break;
         }
 
@@ -707,9 +705,9 @@ export default class RoomView extends React.Component<IProps, IState> {
                     [payload.file], this.state.room.roomId, this.context);
                 break;
             case 'notifier_enabled':
-            case 'upload_started':
-            case 'upload_finished':
-            case 'upload_canceled':
+            case Action.UploadStarted:
+            case Action.UploadFinished:
+            case Action.UploadCanceled:
                 this.forceUpdate();
                 break;
             case 'call_state': {
@@ -1117,7 +1115,7 @@ export default class RoomView extends React.Component<IProps, IState> {
                 const signUrl = this.props.threepidInvite?.signUrl;
                 dis.dispatch({
                     action: 'join_room',
-                    opts: { inviteSignUrl: signUrl, viaServers: this.props.viaServers },
+                    opts: { inviteSignUrl: signUrl },
                     _type: "unknown", // TODO: instrumentation
                 });
                 return Promise.resolve();
@@ -1139,14 +1137,47 @@ export default class RoomView extends React.Component<IProps, IState> {
         this.updateTopUnreadMessagesBar();
     };
 
+    private onDragEnter = ev => {
+        ev.stopPropagation();
+        ev.preventDefault();
+
+        // We always increment the counter no matter the types, because dragging is
+        // still happening. If we didn't, the drag counter would get out of sync.
+        this.setState({dragCounter: this.state.dragCounter + 1});
+
+        // See:
+        // https://docs.w3cub.com/dom/datatransfer/types
+        // https://developer.mozilla.org/en-US/docs/Web/API/HTML_Drag_and_Drop_API/Recommended_drag_types#file
+        if (ev.dataTransfer.types.includes("Files") || ev.dataTransfer.types.includes("application/x-moz-file")) {
+            this.setState({draggingFile: true});
+        }
+    };
+
+    private onDragLeave = ev => {
+        ev.stopPropagation();
+        ev.preventDefault();
+
+        this.setState({
+            dragCounter: this.state.dragCounter - 1,
+        });
+
+        if (this.state.dragCounter === 0) {
+            this.setState({
+                draggingFile: false,
+            });
+        }
+    };
+
     private onDragOver = ev => {
         ev.stopPropagation();
         ev.preventDefault();
 
         ev.dataTransfer.dropEffect = 'none';
 
+        // See:
+        // https://docs.w3cub.com/dom/datatransfer/types
+        // https://developer.mozilla.org/en-US/docs/Web/API/HTML_Drag_and_Drop_API/Recommended_drag_types#file
         if (ev.dataTransfer.types.includes("Files") || ev.dataTransfer.types.includes("application/x-moz-file")) {
-            this.setState({ draggingFile: true });
             ev.dataTransfer.dropEffect = 'copy';
         }
     };
@@ -1157,14 +1188,12 @@ export default class RoomView extends React.Component<IProps, IState> {
         ContentMessages.sharedInstance().sendContentListToRoom(
             ev.dataTransfer.files, this.state.room.roomId, this.context,
         );
-        this.setState({ draggingFile: false });
         dis.fire(Action.FocusComposer);
-    };
 
-    private onDragLeaveOrEnd = ev => {
-        ev.stopPropagation();
-        ev.preventDefault();
-        this.setState({ draggingFile: false });
+        this.setState({
+            draggingFile: false,
+            dragCounter: this.state.dragCounter - 1,
+        });
     };
 
     private injectSticker(url, info, text) {
@@ -1353,6 +1382,14 @@ export default class RoomView extends React.Component<IProps, IState> {
         SettingsStore.setValue("PinnedEvents.isOpen", roomId, SettingLevel.ROOM_DEVICE, nowShowingPinned);
     };
 
+    private onCallPlaced = (type: PlaceCallType) => {
+        dis.dispatch({
+            action: 'place_call',
+            type: type,
+            room_id: this.state.room.roomId,
+        });
+    };
+
     private onSettingsClick = () => {
         dis.dispatch({ action: "open_room_settings" });
     };
@@ -1390,7 +1427,7 @@ export default class RoomView extends React.Component<IProps, IState> {
         });
     };
 
-    private onRejectButtonClicked = ev => {
+    private onRejectButtonClicked = () => {
         this.setState({
             rejecting: true,
         });
@@ -1450,7 +1487,7 @@ export default class RoomView extends React.Component<IProps, IState> {
         }
     };
 
-    private onRejectThreepidInviteButtonClicked = ev => {
+    private onRejectThreepidInviteButtonClicked = () => {
         // We can reject 3pid invites in the same way that we accept them,
         // using /leave rather than /join. In the short term though, we
         // just ignore them.
@@ -1713,7 +1750,10 @@ export default class RoomView extends React.Component<IProps, IState> {
         }
 
         const myMembership = this.state.room.getMyMembership();
-        if (myMembership == 'invite') {
+        if (myMembership === "invite"
+            // SpaceRoomView handles invites itself
+            && (!SettingsStore.getValue("feature_spaces") || !this.state.room.isSpaceRoom())
+        ) {
             if (this.state.joining || this.state.rejecting) {
                 return (
                     <ErrorBoundary>
@@ -1758,6 +1798,19 @@ export default class RoomView extends React.Component<IProps, IState> {
             }
         }
 
+        let fileDropTarget = null;
+        if (this.state.draggingFile) {
+            fileDropTarget = (
+                <div className="mx_RoomView_fileDropTarget">
+                    <img
+                        src={require("../../../res/img/upload-big.svg")}
+                        className="mx_RoomView_fileDropTarget_image"
+                    />
+                    { _t("Drop file here to upload") }
+                </div>
+            );
+        }
+
         // We have successfully loaded this room, and are not previewing.
         // Display the "normal" room view.
 
@@ -1842,7 +1895,7 @@ export default class RoomView extends React.Component<IProps, IState> {
                     room={this.state.room}
                 />
             );
-            if (!this.state.canPeek) {
+            if (!this.state.canPeek && (!SettingsStore.getValue("feature_spaces") || !this.state.room?.isSpaceRoom())) {
                 return (
                     <div className="mx_RoomView">
                         { previewBar }
@@ -1864,12 +1917,23 @@ export default class RoomView extends React.Component<IProps, IState> {
             );
         }
 
+        if (SettingsStore.getValue("feature_spaces") && this.state.room?.isSpaceRoom()) {
+            return <SpaceRoomView
+                space={this.state.room}
+                justCreatedOpts={this.props.justCreatedOpts}
+                resizeNotifier={this.props.resizeNotifier}
+                onJoinButtonClicked={this.onJoinButtonClicked}
+                onRejectButtonClicked={this.props.threepidInvite
+                    ? this.onRejectThreepidInviteButtonClicked
+                    : this.onRejectButtonClicked}
+            />;
+        }
+
         const auxPanel = (
             <AuxPanel
                 room={this.state.room}
                 fullHeight={false}
                 userId={this.context.credentials.userId}
-                draggingFile={this.state.draggingFile}
                 maxHeight={this.state.auxPanelMaxHeight}
                 showApps={this.state.showApps}
                 onResize={this.onResize}
@@ -1957,6 +2021,7 @@ export default class RoomView extends React.Component<IProps, IState> {
                 timelineSet={this.state.room.getUnfilteredTimelineSet()}
                 showReadReceipts={this.state.showReadReceipts}
                 manageReadReceipts={!this.state.isPeeking}
+                sendReadReceiptOnLoad={!this.state.wasContextSwitch}
                 manageReadMarkers={!this.state.isPeeking}
                 hidden={hideMessagePanel}
                 highlightedEventId={highlightedEventId}
@@ -2032,11 +2097,13 @@ export default class RoomView extends React.Component<IProps, IState> {
                             e2eStatus={this.state.e2eStatus}
                             onAppsClick={this.state.hasPinnedWidgets ? this.onAppsClick : null}
                             appsShown={this.state.showApps}
+                            onCallPlaced={this.onCallPlaced}
                         />
                         <MainSplit panel={rightPanel} resizeNotifier={this.props.resizeNotifier}>
                             <div className="mx_RoomView_body">
                                 {auxPanel}
                                 <div className={timelineClasses}>
+                                    {fileDropTarget}
                                     {topUnreadMessagesBar}
                                     {jumpToBottom}
                                     {messagePanel}

src/components/structures/ScrollPanel.js

@@ -16,9 +16,10 @@ limitations under the License.
 
 import React, {createRef} from "react";
 import PropTypes from 'prop-types';
-import { Key } from '../../Keyboard';
 import Timer from '../../utils/Timer';
 import AutoHideScrollbar from "./AutoHideScrollbar";
+import {replaceableComponent} from "../../utils/replaceableComponent";
+import {getKeyBindingsManager, RoomAction} from "../../KeyBindingsManager";
 
 const DEBUG_SCROLL = false;
 
@@ -83,6 +84,7 @@ if (DEBUG_SCROLL) {
  * offset as normal.
  */
 
+@replaceableComponent("structures.ScrollPanel")
 export default class ScrollPanel extends React.Component {
     static propTypes = {
         /* stickyBottom: if set to true, then once the user hits the bottom of
@@ -523,7 +525,7 @@ export default class ScrollPanel extends React.Component {
      */
     scrollRelative = mult => {
         const scrollNode = this._getScrollNode();
-        const delta = mult * scrollNode.clientHeight * 0.5;
+        const delta = mult * scrollNode.clientHeight * 0.9;
         scrollNode.scrollBy(0, delta);
         this._saveScrollState();
     };
@@ -533,29 +535,19 @@ export default class ScrollPanel extends React.Component {
      * @param {object} ev the keyboard event
      */
     handleScrollKey = ev => {
-        switch (ev.key) {
-            case Key.PAGE_UP:
-                if (!ev.ctrlKey && !ev.shiftKey && !ev.altKey && !ev.metaKey) {
-                    this.scrollRelative(-1);
-                }
+        const roomAction = getKeyBindingsManager().getRoomAction(ev);
+        switch (roomAction) {
+            case RoomAction.ScrollUp:
+                this.scrollRelative(-1);
                 break;
-
-            case Key.PAGE_DOWN:
-                if (!ev.ctrlKey && !ev.shiftKey && !ev.altKey && !ev.metaKey) {
-                    this.scrollRelative(1);
-                }
+            case RoomAction.RoomScrollDown:
+                this.scrollRelative(1);
                 break;
-
-            case Key.HOME:
-                if (ev.ctrlKey && !ev.shiftKey && !ev.altKey && !ev.metaKey) {
-                    this.scrollToTop();
-                }
+            case RoomAction.JumpToFirstMessage:
+                this.scrollToTop();
                 break;
-
-            case Key.END:
-                if (ev.ctrlKey && !ev.shiftKey && !ev.altKey && !ev.metaKey) {
-                    this.scrollToBottom();
-                }
+            case RoomAction.JumpToLatestMessage:
+                this.scrollToBottom();
                 break;
         }
     };
@@ -892,16 +884,20 @@ export default class ScrollPanel extends React.Component {
 
         // give the <ol> an explicit role=list because Safari+VoiceOver seems to think an ordered-list with
         // list-style-type: none; is no longer a list
-        return (<AutoHideScrollbar wrappedRef={this._collectScroll}
+        return (
+            <AutoHideScrollbar
+                wrappedRef={this._collectScroll}
                 onScroll={this.onScroll}
-                className={`mx_ScrollPanel ${this.props.className}`} style={this.props.style}>
-                    { this.props.fixedChildren }
-                    <div className="mx_RoomView_messageListWrapper">
-                        <ol ref={this._itemlist} className="mx_RoomView_MessageList" aria-live="polite" role="list">
-                            { this.props.children }
-                        </ol>
-                    </div>
-                </AutoHideScrollbar>
-            );
+                className={`mx_ScrollPanel ${this.props.className}`}
+                style={this.props.style}
+            >
+                { this.props.fixedChildren }
+                <div className="mx_RoomView_messageListWrapper">
+                    <ol ref={this._itemlist} className="mx_RoomView_MessageList" aria-live="polite" role="list">
+                        { this.props.children }
+                    </ol>
+                </div>
+            </AutoHideScrollbar>
+        );
     }
 }

src/components/structures/SearchBox.js

@@ -22,7 +22,9 @@ import dis from '../../dispatcher/dispatcher';
 import {throttle} from 'lodash';
 import AccessibleButton from '../../components/views/elements/AccessibleButton';
 import classNames from 'classnames';
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
+@replaceableComponent("structures.SearchBox")
 export default class SearchBox extends React.Component {
     static propTypes = {
         onSearch: PropTypes.func,
@@ -30,6 +32,8 @@ export default class SearchBox extends React.Component {
         onKeyDown: PropTypes.func,
         className: PropTypes.string,
         placeholder: PropTypes.string.isRequired,
+        autoFocus: PropTypes.bool,
+        initialValue: PropTypes.string,
 
         // If true, the search box will focus and clear itself
         // on room search focus action (it would be nicer to take
@@ -47,7 +51,7 @@ export default class SearchBox extends React.Component {
         this._search = createRef();
 
         this.state = {
-            searchTerm: "",
+            searchTerm: this.props.initialValue || "",
             blurred: true,
         };
     }
@@ -156,6 +160,7 @@ export default class SearchBox extends React.Component {
                     onBlur={this._onBlur}
                     placeholder={ placeholder }
                     autoComplete="off"
+                    autoFocus={this.props.autoFocus}
                 />
                 { clearButton }
             </div>

src/components/structures/SpaceRoomDirectory.tsx

@@ -0,0 +1,647 @@
+/*
+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, {ReactNode, useMemo, useState} 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 classNames from "classnames";
+import {sortBy} from "lodash";
+
+import {MatrixClientPeg} from "../../MatrixClientPeg";
+import dis from "../../dispatcher/dispatcher";
+import {_t} from "../../languageHandler";
+import AccessibleButton, {ButtonEvent} from "../views/elements/AccessibleButton";
+import BaseDialog from "../views/dialogs/BaseDialog";
+import Spinner from "../views/elements/Spinner";
+import SearchBox from "./SearchBox";
+import RoomAvatar from "../views/avatars/RoomAvatar";
+import RoomName from "../views/elements/RoomName";
+import {useAsyncMemo} from "../../hooks/useAsyncMemo";
+import {EnhancedMap} from "../../utils/maps";
+import StyledCheckbox from "../views/elements/StyledCheckbox";
+import AutoHideScrollbar from "./AutoHideScrollbar";
+import BaseAvatar from "../views/avatars/BaseAvatar";
+import {mediaFromMxc} from "../../customisations/Media";
+import InfoTooltip from "../views/elements/InfoTooltip";
+import TextWithTooltip from "../views/elements/TextWithTooltip";
+import {useStateToggle} from "../../hooks/useStateToggle";
+import {getOrder} from "../../stores/SpaceStore";
+import AccessibleTooltipButton from "../views/elements/AccessibleTooltipButton";
+
+interface IHierarchyProps {
+    space: Room;
+    initialText?: string;
+    refreshToken?: any;
+    additionalButtons?: ReactNode;
+    showRoom(room: ISpaceSummaryRoom, viaServers?: string[], autoJoin?: boolean): void;
+}
+
+/* eslint-disable camelcase */
+export interface ISpaceSummaryRoom {
+    canonical_alias?: string;
+    aliases: string[];
+    avatar_url?: string;
+    guest_can_join: boolean;
+    name?: string;
+    num_joined_members: number
+    room_id: string;
+    topic?: string;
+    world_readable: boolean;
+    num_refs: number;
+    room_type: string;
+}
+
+export interface ISpaceSummaryEvent {
+    room_id: string;
+    event_id: string;
+    origin_server_ts: number;
+    type: string;
+    state_key: string;
+    content: {
+        order?: string;
+        suggested?: boolean;
+        auto_join?: boolean;
+        via?: string;
+    };
+}
+/* eslint-enable camelcase */
+
+interface ITileProps {
+    room: ISpaceSummaryRoom;
+    suggested?: boolean;
+    selected?: boolean;
+    numChildRooms?: number;
+    hasPermissions?: boolean;
+    onViewRoomClick(autoJoin: boolean): void;
+    onToggleClick?(): void;
+}
+
+const Tile: React.FC<ITileProps> = ({
+    room,
+    suggested,
+    selected,
+    hasPermissions,
+    onToggleClick,
+    onViewRoomClick,
+    numChildRooms,
+    children,
+}) => {
+    const name = room.name || room.canonical_alias || room.aliases?.[0]
+        || (room.room_type === RoomType.Space ? _t("Unnamed Space") : _t("Unnamed Room"));
+
+    const [showChildren, toggleShowChildren] = useStateToggle(true);
+
+    const cli = MatrixClientPeg.get();
+    const cliRoom = cli.getRoom(room.room_id);
+    const myMembership = cliRoom?.getMyMembership();
+
+    const onPreviewClick = (ev: ButtonEvent) => {
+        ev.preventDefault();
+        ev.stopPropagation();
+        onViewRoomClick(false);
+    }
+    const onJoinClick = (ev: ButtonEvent) => {
+        ev.preventDefault();
+        ev.stopPropagation();
+        onViewRoomClick(true);
+    }
+
+    let button;
+    if (myMembership === "join") {
+        button = <AccessibleButton onClick={onPreviewClick} kind="primary_outline">
+            { _t("View") }
+        </AccessibleButton>;
+    } else if (onJoinClick) {
+        button = <AccessibleButton onClick={onJoinClick} kind="primary">
+            { _t("Join") }
+        </AccessibleButton>;
+    }
+
+    let checkbox;
+    if (onToggleClick) {
+        if (hasPermissions) {
+            checkbox = <StyledCheckbox checked={!!selected} onChange={onToggleClick} />;
+        } else {
+            checkbox = <TextWithTooltip
+                tooltip={_t("You don't have permission")}
+                onClick={ev => { ev.stopPropagation() }}
+            >
+                <StyledCheckbox disabled={true} />
+            </TextWithTooltip>;
+        }
+    }
+
+    let url: string;
+    if (room.avatar_url) {
+        url = mediaFromMxc(room.avatar_url).getSquareThumbnailHttp(20);
+    }
+
+    let description = _t("%(count)s members", { count: room.num_joined_members });
+    if (numChildRooms) {
+        description += " · " + _t("%(count)s rooms", { count: numChildRooms });
+    }
+    if (room.topic) {
+        description += " · " + room.topic;
+    }
+
+    let suggestedSection;
+    if (suggested) {
+        suggestedSection = <InfoTooltip tooltip={_t("This room is suggested as a good one to join")}>
+            { _t("Suggested") }
+        </InfoTooltip>;
+    }
+
+    const content = <React.Fragment>
+        <BaseAvatar name={name} idName={room.room_id} url={url} width={20} height={20} />
+        <div className="mx_SpaceRoomDirectory_roomTile_name">
+            { name }
+            { suggestedSection }
+        </div>
+
+        <div className="mx_SpaceRoomDirectory_roomTile_info">
+            { description }
+        </div>
+        <div className="mx_SpaceRoomDirectory_actions">
+            { button }
+            { checkbox }
+        </div>
+    </React.Fragment>;
+
+    let childToggle;
+    let childSection;
+    if (children) {
+        // the chevron is purposefully a div rather than a button as it should be ignored for a11y
+        childToggle = <div
+            className={classNames("mx_SpaceRoomDirectory_subspace_toggle", {
+                mx_SpaceRoomDirectory_subspace_toggle_shown: showChildren,
+            })}
+            onClick={ev => {
+                ev.stopPropagation();
+                toggleShowChildren();
+            }}
+        />;
+        if (showChildren) {
+            childSection = <div className="mx_SpaceRoomDirectory_subspace_children">
+                { children }
+            </div>;
+        }
+    }
+
+    return <>
+        <AccessibleButton
+            className={classNames("mx_SpaceRoomDirectory_roomTile", {
+                mx_SpaceRoomDirectory_subspace: room.room_type === RoomType.Space,
+            })}
+            onClick={(hasPermissions && onToggleClick) ? onToggleClick : onPreviewClick}
+        >
+            { content }
+            { childToggle }
+        </AccessibleButton>
+        { childSection }
+    </>;
+};
+
+export const showRoom = (room: ISpaceSummaryRoom, viaServers?: string[], autoJoin = false) => {
+    // Don't let the user view a room they won't be able to either peek or join:
+    // fail earlier so they don't have to click back to the directory.
+    if (MatrixClientPeg.get().isGuest()) {
+        if (!room.world_readable && !room.guest_can_join) {
+            dis.dispatch({ action: "require_registration" });
+            return;
+        }
+    }
+
+    const roomAlias = getDisplayAliasForRoom(room) || undefined;
+    dis.dispatch({
+        action: "view_room",
+        auto_join: autoJoin,
+        should_peek: true,
+        _type: "room_directory", // instrumentation
+        room_alias: roomAlias,
+        room_id: room.room_id,
+        via_servers: viaServers,
+        oob_data: {
+            avatarUrl: room.avatar_url,
+            // XXX: This logic is duplicated from the JS SDK which would normally decide what the name is.
+            name: room.name || roomAlias || _t("Unnamed room"),
+        },
+    });
+};
+
+interface IHierarchyLevelProps {
+    spaceId: string;
+    rooms: Map<string, ISpaceSummaryRoom>;
+    relations: Map<string, Map<string, ISpaceSummaryEvent>>;
+    parents: Set<string>;
+    selectedMap?: Map<string, Set<string>>;
+    onViewRoomClick(roomId: string, autoJoin: boolean): void;
+    onToggleClick?(parentId: string, childId: string): void;
+}
+
+export const HierarchyLevel = ({
+    spaceId,
+    rooms,
+    relations,
+    parents,
+    selectedMap,
+    onViewRoomClick,
+    onToggleClick,
+}: IHierarchyLevelProps) => {
+    const cli = MatrixClientPeg.get();
+    const space = cli.getRoom(spaceId);
+    const hasPermissions = space?.currentState.maySendStateEvent(EventType.SpaceChild, cli.getUserId());
+
+    const children = Array.from(relations.get(spaceId)?.values() || []);
+    const sortedChildren = sortBy(children, ev => {
+        // XXX: Space Summary API doesn't give the child origin_server_ts but once it does we should use it for sorting
+        return getOrder(ev.content.order, null, ev.state_key);
+    });
+    const [subspaces, childRooms] = sortedChildren.reduce((result, ev: ISpaceSummaryEvent) => {
+        const roomId = ev.state_key;
+        if (!rooms.has(roomId)) return result;
+        result[rooms.get(roomId).room_type === RoomType.Space ? 0 : 1].push(roomId);
+        return result;
+    }, [[], []]) || [[], []];
+
+    const newParents = new Set(parents).add(spaceId);
+    return <React.Fragment>
+        {
+            childRooms.map(roomId => (
+                <Tile
+                    key={roomId}
+                    room={rooms.get(roomId)}
+                    suggested={relations.get(spaceId)?.get(roomId)?.content.suggested}
+                    selected={selectedMap?.get(spaceId)?.has(roomId)}
+                    onViewRoomClick={(autoJoin) => {
+                        onViewRoomClick(roomId, autoJoin);
+                    }}
+                    hasPermissions={hasPermissions}
+                    onToggleClick={onToggleClick ? () => onToggleClick(spaceId, roomId) : undefined}
+                />
+            ))
+        }
+
+        {
+            subspaces.filter(roomId => !newParents.has(roomId)).map(roomId => (
+                <Tile
+                    key={roomId}
+                    room={rooms.get(roomId)}
+                    numChildRooms={Array.from(relations.get(roomId)?.values() || [])
+                        .filter(ev => rooms.get(ev.state_key)?.room_type !== RoomType.Space).length}
+                    suggested={relations.get(spaceId)?.get(roomId)?.content.suggested}
+                    selected={selectedMap?.get(spaceId)?.has(roomId)}
+                    onViewRoomClick={(autoJoin) => {
+                        onViewRoomClick(roomId, autoJoin);
+                    }}
+                    hasPermissions={hasPermissions}
+                    onToggleClick={onToggleClick ? () => onToggleClick(spaceId, roomId) : undefined}
+                >
+                    <HierarchyLevel
+                        spaceId={roomId}
+                        rooms={rooms}
+                        relations={relations}
+                        parents={newParents}
+                        selectedMap={selectedMap}
+                        onViewRoomClick={onViewRoomClick}
+                        onToggleClick={onToggleClick}
+                    />
+                </Tile>
+            ))
+        }
+    </React.Fragment>
+};
+
+// mutate argument refreshToken to force a reload
+export const useSpaceSummary = (cli: MatrixClient, space: Room, refreshToken?: any): [
+    null,
+    ISpaceSummaryRoom[],
+    Map<string, Map<string, ISpaceSummaryEvent>>?,
+    Map<string, Set<string>>?,
+    Map<string, Set<string>>?,
+] | [Error] => {
+    // TODO pagination
+    return useAsyncMemo(async () => {
+        try {
+            const data = await cli.getSpaceSummary(space.roomId);
+
+            const parentChildRelations = new EnhancedMap<string, Map<string, ISpaceSummaryEvent>>();
+            const childParentRelations = new EnhancedMap<string, Set<string>>();
+            const viaMap = new EnhancedMap<string, Set<string>>();
+            data.events.map((ev: ISpaceSummaryEvent) => {
+                if (ev.type === EventType.SpaceChild) {
+                    parentChildRelations.getOrCreate(ev.room_id, new Map()).set(ev.state_key, ev);
+                    childParentRelations.getOrCreate(ev.state_key, new Set()).add(ev.room_id);
+                }
+                if (Array.isArray(ev.content["via"])) {
+                    const set = viaMap.getOrCreate(ev.state_key, new Set());
+                    ev.content["via"].forEach(via => set.add(via));
+                }
+            });
+
+            return [null, data.rooms as ISpaceSummaryRoom[], parentChildRelations, viaMap, childParentRelations];
+        } catch (e) {
+            console.error(e); // TODO
+            return [e];
+        }
+    }, [space, refreshToken], [undefined]);
+};
+
+export const SpaceHierarchy: React.FC<IHierarchyProps> = ({
+    space,
+    initialText = "",
+    showRoom,
+    refreshToken,
+    additionalButtons,
+    children,
+}) => {
+    const cli = MatrixClientPeg.get();
+    const userId = cli.getUserId();
+    const [query, setQuery] = useState(initialText);
+
+    const [selected, setSelected] = useState(new Map<string, Set<string>>()); // Map<parentId, Set<childId>>
+
+    const [summaryError, rooms, parentChildMap, viaMap, childParentMap] = useSpaceSummary(cli, space, refreshToken);
+
+    const roomsMap = useMemo(() => {
+        if (!rooms) return null;
+        const lcQuery = query.toLowerCase().trim();
+
+        const roomsMap = new Map<string, ISpaceSummaryRoom>(rooms.map(r => [r.room_id, r]));
+        if (!lcQuery) return roomsMap;
+
+        const directMatches = rooms.filter(r => {
+            return r.name?.toLowerCase().includes(lcQuery) || r.topic?.toLowerCase().includes(lcQuery);
+        });
+
+        // Walk back up the tree to find all parents of the direct matches to show their place in the hierarchy
+        const visited = new Set<string>();
+        const queue = [...directMatches.map(r => r.room_id)];
+        while (queue.length) {
+            const roomId = queue.pop();
+            visited.add(roomId);
+            childParentMap.get(roomId)?.forEach(parentId => {
+                if (!visited.has(parentId)) {
+                    queue.push(parentId);
+                }
+            });
+        }
+
+        // Remove any mappings for rooms which were not visited in the walk
+        Array.from(roomsMap.keys()).forEach(roomId => {
+            if (!visited.has(roomId)) {
+                roomsMap.delete(roomId);
+            }
+        });
+        return roomsMap;
+    }, [rooms, childParentMap, query]);
+
+    const [error, setError] = useState("");
+    const [removing, setRemoving] = useState(false);
+    const [saving, setSaving] = useState(false);
+
+    if (summaryError) {
+        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 !== RoomType.Space).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 });
+        }
+
+        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).get(childId).content = {};
+                                parentChildMap.set(parentId, new Map(parentChildMap.get(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);
+                    }}
+                    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 description") }
+            onSearch={setQuery}
+            autoFocus={true}
+            initialValue={initialText}
+        />
+
+        { content }
+    </>;
+};
+
+interface IProps {
+    space: Room;
+    initialText?: string;
+    onFinished(): void;
+}
+
+const SpaceRoomDirectory: React.FC<IProps> = ({ space, onFinished, initialText }) => {
+    const onCreateRoomClick = () => {
+        dis.dispatch({
+            action: 'view_create_room',
+            public: true,
+        });
+        onFinished();
+    };
+
+    const title = <React.Fragment>
+        <RoomAvatar room={space} height={32} width={32} />
+        <div>
+            <h1>{ _t("Explore rooms") }</h1>
+            <div><RoomName room={space} /></div>
+        </div>
+    </React.Fragment>;
+
+    return (
+        <BaseDialog className="mx_SpaceRoomDirectory" hasCancel={true} onFinished={onFinished} title={title}>
+            <div className="mx_Dialog_content">
+                { _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>;
+                    }},
+                ) }
+
+                <SpaceHierarchy
+                    space={space}
+                    showRoom={(room: ISpaceSummaryRoom, viaServers?: string[], autoJoin = false) => {
+                        showRoom(room, viaServers, autoJoin);
+                        onFinished();
+                    }}
+                    initialText={initialText}
+                >
+                    <AccessibleButton
+                        onClick={onCreateRoomClick}
+                        kind="primary"
+                        className="mx_SpaceRoomDirectory_createRoom"
+                    >
+                        { _t("Create room") }
+                    </AccessibleButton>
+                </SpaceHierarchy>
+            </div>
+        </BaseDialog>
+    );
+};
+
+export default SpaceRoomDirectory;
+
+// Similar to matrix-react-sdk's MatrixTools.getDisplayAliasForRoom
+// but works with the objects we get from the public room list
+function getDisplayAliasForRoom(room: ISpaceSummaryRoom) {
+    return room.canonical_alias || (room.aliases ? room.aliases[0] : "");
+}

src/components/structures/SpaceRoomView.tsx

@@ -0,0 +1,827 @@
+/*
+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, {RefObject, useContext, useRef, useState} from "react";
+import {EventType} from "matrix-js-sdk/src/@types/event";
+import {Room} from "matrix-js-sdk/src/models/room";
+import {EventSubscription} from "fbemitter";
+
+import MatrixClientContext from "../../contexts/MatrixClientContext";
+import RoomAvatar from "../views/avatars/RoomAvatar";
+import {_t} from "../../languageHandler";
+import AccessibleButton from "../views/elements/AccessibleButton";
+import RoomName from "../views/elements/RoomName";
+import RoomTopic from "../views/elements/RoomTopic";
+import InlineSpinner from "../views/elements/InlineSpinner";
+import {inviteMultipleToRoom, showRoomInviteDialog} from "../../RoomInvite";
+import {useRoomMembers} from "../../hooks/useRoomMembers";
+import createRoom, {IOpts, Preset} from "../../createRoom";
+import Field from "../views/elements/Field";
+import {useEventEmitter} from "../../hooks/useEventEmitter";
+import withValidation from "../views/elements/Validation";
+import * as Email from "../../email";
+import defaultDispatcher from "../../dispatcher/dispatcher";
+import {Action} from "../../dispatcher/actions";
+import ResizeNotifier from "../../utils/ResizeNotifier"
+import MainSplit from './MainSplit';
+import ErrorBoundary from "../views/elements/ErrorBoundary";
+import {ActionPayload} from "../../dispatcher/payloads";
+import RightPanel from "./RightPanel";
+import RightPanelStore from "../../stores/RightPanelStore";
+import {RightPanelPhases} from "../../stores/RightPanelStorePhases";
+import {SetRightPanelPhasePayload} from "../../dispatcher/payloads/SetRightPanelPhasePayload";
+import {useStateArray} from "../../hooks/useStateArray";
+import SpacePublicShare from "../views/spaces/SpacePublicShare";
+import {showAddExistingRooms, showCreateNewRoom, shouldShowSpaceSettings, 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 {sleep} from "../../utils/promise";
+import {calculateRoomVia} from "../../utils/permalinks/Permalinks";
+import {ChevronFace, ContextMenuButton, useContextMenu} from "./ContextMenu";
+import IconizedContextMenu, {
+    IconizedContextMenuOption,
+    IconizedContextMenuOptionList,
+} from "../views/context_menus/IconizedContextMenu";
+import AccessibleTooltipButton from "../views/elements/AccessibleTooltipButton";
+
+interface IProps {
+    space: Room;
+    justCreatedOpts?: IOpts;
+    resizeNotifier: ResizeNotifier;
+    onJoinButtonClicked(): void;
+    onRejectButtonClicked(): void;
+}
+
+interface IState {
+    phase: Phase;
+    showRightPanel: boolean;
+    myMembership: string;
+}
+
+enum Phase {
+    Landing,
+    PublicCreateRooms,
+    PublicShare,
+    PrivateScope,
+    PrivateInvite,
+    PrivateCreateRooms,
+    PrivateExistingRooms,
+}
+
+const RoomMemberCount = ({ room, children }) => {
+    const members = useRoomMembers(room);
+    const count = members.length;
+
+    if (children) return children(count);
+    return count;
+};
+
+const useMyRoomMembership = (room: Room) => {
+    const [membership, setMembership] = useState(room.getMyMembership());
+    useEventEmitter(room, "Room.myMembership", () => {
+        setMembership(room.getMyMembership());
+    });
+    return membership;
+};
+
+const SpaceInfo = ({ space }) => {
+    const joinRule = space.getJoinRule();
+
+    let visibilitySection;
+    if (joinRule === "public") {
+        visibilitySection = <span className="mx_SpaceRoomView_info_public">
+            { _t("Public space") }
+        </span>;
+    } else {
+        visibilitySection = <span className="mx_SpaceRoomView_info_private">
+            { _t("Private space") }
+        </span>;
+    }
+
+    return <div className="mx_SpaceRoomView_info">
+        { visibilitySection }
+        { joinRule === "public" && <RoomMemberCount room={space}>
+            {(count) => count > 0 ? (
+                <AccessibleButton
+                    kind="link"
+                    onClick={() => {
+                        defaultDispatcher.dispatch<SetRightPanelPhasePayload>({
+                            action: Action.SetRightPanelPhase,
+                            phase: RightPanelPhases.RoomMemberList,
+                            refireParams: { space },
+                        });
+                    }}
+                >
+                    { _t("%(count)s members", { count }) }
+                </AccessibleButton>
+            ) : null}
+        </RoomMemberCount> }
+    </div>
+};
+
+const SpacePreview = ({ space, onJoinButtonClicked, onRejectButtonClicked }) => {
+    const cli = useContext(MatrixClientContext);
+    const myMembership = useMyRoomMembership(space);
+
+    const [busy, setBusy] = useState(false);
+
+    let inviterSection;
+    let joinButtons;
+    if (myMembership === "invite") {
+        const inviteSender = space.getMember(cli.getUserId())?.events.member?.getSender();
+        const inviter = inviteSender && space.getMember(inviteSender);
+
+        if (inviteSender) {
+            inviterSection = <div className="mx_SpaceRoomView_preview_inviter">
+                <MemberAvatar member={inviter} width={32} height={32} />
+                <div>
+                    <div className="mx_SpaceRoomView_preview_inviter_name">
+                        { _t("<inviter/> invites you", {}, {
+                            inviter: () => <b>{ inviter.name || inviteSender }</b>,
+                        }) }
+                    </div>
+                    { inviter ? <div className="mx_SpaceRoomView_preview_inviter_mxid">
+                        { inviteSender }
+                    </div> : null }
+                </div>
+            </div>;
+        }
+
+        joinButtons = <>
+            <AccessibleButton
+                kind="secondary"
+                onClick={() => {
+                    setBusy(true);
+                    onRejectButtonClicked();
+                }}
+            >
+                { _t("Reject") }
+            </AccessibleButton>
+            <AccessibleButton
+                kind="primary"
+                onClick={() => {
+                    setBusy(true);
+                    onJoinButtonClicked();
+                }}
+            >
+                { _t("Accept") }
+            </AccessibleButton>
+        </>;
+    } else {
+        joinButtons = (
+            <AccessibleButton
+                kind="primary"
+                onClick={() => {
+                    setBusy(true);
+                    onJoinButtonClicked();
+                }}
+            >
+                { _t("Join") }
+            </AccessibleButton>
+        )
+    }
+
+    if (busy) {
+        joinButtons = <InlineSpinner />;
+    }
+
+    return <div className="mx_SpaceRoomView_preview">
+        { inviterSection }
+        <RoomAvatar room={space} height={80} width={80} viewAvatarOnClick={true} />
+        <h1 className="mx_SpaceRoomView_preview_name">
+            <RoomName room={space} />
+        </h1>
+        <SpaceInfo space={space} />
+        <RoomTopic room={space}>
+            {(topic, ref) =>
+                <div className="mx_SpaceRoomView_preview_topic" ref={ref}>
+                    { topic }
+                </div>
+            }
+        </RoomTopic>
+        { space.getJoinRule() === "public" && <FacePile room={space} /> }
+        <div className="mx_SpaceRoomView_preview_joinButtons">
+            { joinButtons }
+        </div>
+    </div>;
+};
+
+const SpaceLandingAddButton = ({ space, onNewRoomAdded }) => {
+    const cli = useContext(MatrixClientContext);
+    const [menuDisplayed, handle, openMenu, closeMenu] = useContextMenu();
+
+    let contextMenu;
+    if (menuDisplayed) {
+        const rect = handle.current.getBoundingClientRect();
+        contextMenu = <IconizedContextMenu
+            left={rect.left + window.pageXOffset + 0}
+            top={rect.bottom + window.pageYOffset + 8}
+            chevronFace={ChevronFace.None}
+            onFinished={closeMenu}
+            className="mx_RoomTile_contextMenu"
+            compact
+        >
+            <IconizedContextMenuOptionList first>
+                <IconizedContextMenuOption
+                    label={_t("Create new room")}
+                    iconClassName="mx_RoomList_iconPlus"
+                    onClick={async (e) => {
+                        e.preventDefault();
+                        e.stopPropagation();
+                        closeMenu();
+
+                        if (await showCreateNewRoom(cli, space)) {
+                            onNewRoomAdded();
+                        }
+                    }}
+                />
+                <IconizedContextMenuOption
+                    label={_t("Add existing room")}
+                    iconClassName="mx_RoomList_iconHash"
+                    onClick={async (e) => {
+                        e.preventDefault();
+                        e.stopPropagation();
+                        closeMenu();
+
+                        const [added] = await showAddExistingRooms(cli, space);
+                        if (added) {
+                            onNewRoomAdded();
+                        }
+                    }}
+                />
+            </IconizedContextMenuOptionList>
+        </IconizedContextMenu>;
+    }
+
+    return <>
+        <ContextMenuButton
+            kind="primary"
+            inputRef={handle}
+            onClick={openMenu}
+            isExpanded={menuDisplayed}
+            label={_t("Add")}
+        >
+            { _t("Add") }
+        </ContextMenuButton>
+        { contextMenu }
+    </>;
+};
+
+const SpaceLanding = ({ space }) => {
+    const cli = useContext(MatrixClientContext);
+    const myMembership = useMyRoomMembership(space);
+    const userId = cli.getUserId();
+
+    let inviteButton;
+    if (myMembership === "join" && space.canInvite(userId)) {
+        inviteButton = (
+            <AccessibleButton
+                kind="primary"
+                className="mx_SpaceRoomView_landing_inviteButton"
+                onClick={() => {
+                    showRoomInviteDialog(space.roomId);
+                }}
+            >
+                { _t("Invite") }
+            </AccessibleButton>
+        );
+    }
+
+    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} />;
+    }
+
+    let settingsButton;
+    if (shouldShowSpaceSettings(cli, space)) {
+        settingsButton = <AccessibleTooltipButton
+            className="mx_SpaceRoomView_landing_settingsButton"
+            onClick={() => {
+                showSpaceSettings(cli, space);
+            }}
+            title={_t("Settings")}
+        />;
+    }
+
+    const onMembersClick = () => {
+        defaultDispatcher.dispatch<SetRightPanelPhasePayload>({
+            action: Action.SetRightPanelPhase,
+            phase: RightPanelPhases.RoomMemberList,
+            refireParams: { space },
+        });
+    };
+
+    return <div className="mx_SpaceRoomView_landing">
+        <RoomAvatar room={space} height={80} width={80} viewAvatarOnClick={true} />
+        <div className="mx_SpaceRoomView_landing_name">
+            <RoomName room={space}>
+                {(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">
+            <SpaceInfo space={space} />
+            <FacePile room={space} onlyKnownUsers={false} numShown={7} onClick={onMembersClick} />
+            { inviteButton }
+            { settingsButton }
+        </div>
+        <div className="mx_SpaceRoomView_landing_topic">
+            <RoomTopic room={space} />
+        </div>
+        <hr />
+
+        <SpaceHierarchy
+            space={space}
+            showRoom={showRoom}
+            refreshToken={refreshToken}
+            additionalButtons={addRoomButton}
+        />
+    </div>;
+};
+
+const SpaceSetupFirstRooms = ({ space, title, description, onFinished }) => {
+    const [busy, setBusy] = useState(false);
+    const [error, setError] = useState("");
+    const numFields = 3;
+    const placeholders = [_t("General"), _t("Random"), _t("Support")];
+    // TODO vary default prefills for "Just Me" spaces
+    const [roomNames, setRoomName] = useStateArray(numFields, [_t("General"), _t("Random"), ""]);
+    const fields = new Array(numFields).fill(0).map((_, i) => {
+        const name = "roomName" + i;
+        return <Field
+            key={name}
+            name={name}
+            type="text"
+            label={_t("Room name")}
+            placeholder={placeholders[i]}
+            value={roomNames[i]}
+            onChange={ev => setRoomName(i, ev.target.value)}
+            autoFocus={i === 2}
+        />;
+    });
+
+    const onNextClick = async () => {
+        setError("");
+        setBusy(true);
+        try {
+            await Promise.all(roomNames.map(name => name.trim()).filter(Boolean).map(name => {
+                return createRoom({
+                    createOpts: {
+                        preset: space.getJoinRule() === "public" ? Preset.PublicChat : Preset.PrivateChat,
+                        name,
+                    },
+                    spinner: false,
+                    encryption: false,
+                    andView: false,
+                    inlineErrors: true,
+                    parentSpace: space,
+                });
+            }));
+            onFinished();
+        } catch (e) {
+            console.error("Failed to create initial space rooms", e);
+            setError(_t("Failed to create initial space rooms"));
+        }
+        setBusy(false);
+    };
+
+    let onClick = onFinished;
+    let buttonLabel = _t("Skip for now");
+    if (roomNames.some(name => name.trim())) {
+        onClick = onNextClick;
+        buttonLabel = busy ? _t("Creating rooms...") : _t("Continue");
+    }
+
+    return <div>
+        <h1>{ title }</h1>
+        <div className="mx_SpaceRoomView_description">{ description }</div>
+
+        { error && <div className="mx_SpaceRoomView_errorText">{ error }</div> }
+        { fields }
+
+        <div className="mx_SpaceRoomView_buttons">
+            <AccessibleButton
+                kind="primary"
+                disabled={busy}
+                onClick={onClick}
+            >
+                { buttonLabel }
+            </AccessibleButton>
+        </div>
+    </div>;
+};
+
+const SpaceAddExistingRooms = ({ space, onFinished }) => {
+    const [selectedToAdd, setSelectedToAdd] = useState(new Set<Room>());
+
+    const [busy, setBusy] = useState(false);
+    const [error, setError] = useState("");
+
+    let onClick = onFinished;
+    let buttonLabel = _t("Skip for now");
+    if (selectedToAdd.size > 0) {
+        onClick = async () => {
+            setBusy(true);
+
+            for (const room of selectedToAdd) {
+                const via = calculateRoomVia(room);
+                try {
+                    await SpaceStore.instance.addRoomToSpace(space, room.roomId, via).catch(async e => {
+                        if (e.errcode === "M_LIMIT_EXCEEDED") {
+                            await sleep(e.data.retry_after_ms);
+                            return SpaceStore.instance.addRoomToSpace(space, room.roomId, via); // retry
+                        }
+
+                        throw e;
+                    });
+                } catch (e) {
+                    console.error("Failed to add rooms to space", e);
+                    setError(_t("Failed to add rooms to space"));
+                    break;
+                }
+            }
+            setBusy(false);
+        };
+        buttonLabel = busy ? _t("Adding...") : _t("Add");
+    }
+
+    return <div>
+        <h1>{ _t("What do you want to organise?") }</h1>
+        <div className="mx_SpaceRoomView_description">
+            { _t("Pick rooms or conversations to add. This is just a space for you, " +
+                "no one will be informed. You can add more later.") }
+        </div>
+
+        { error && <div className="mx_SpaceRoomView_errorText">{ error }</div> }
+
+        <AddExistingToSpace
+            space={space}
+            selected={selectedToAdd}
+            onChange={(checked, room) => {
+                if (checked) {
+                    selectedToAdd.add(room);
+                } else {
+                    selectedToAdd.delete(room);
+                }
+                setSelectedToAdd(new Set(selectedToAdd));
+            }}
+        />
+
+        <div className="mx_SpaceRoomView_buttons">
+            <AccessibleButton
+                kind="primary"
+                disabled={busy}
+                onClick={onClick}
+            >
+                { buttonLabel }
+            </AccessibleButton>
+        </div>
+    </div>;
+};
+
+const SpaceSetupPublicShare = ({ space, onFinished }) => {
+    return <div className="mx_SpaceRoomView_publicShare">
+        <h1>{ _t("Share %(name)s", { name: space.name }) }</h1>
+        <div className="mx_SpaceRoomView_description">
+            { _t("It's just you at the moment, it will be even better with others.") }
+        </div>
+
+        <SpacePublicShare space={space} />
+
+        <div className="mx_SpaceRoomView_buttons">
+            <AccessibleButton kind="primary" onClick={onFinished}>
+                { _t("Go to my first room") }
+            </AccessibleButton>
+        </div>
+    </div>;
+};
+
+const SpaceSetupPrivateScope = ({ space, onFinished }) => {
+    return <div className="mx_SpaceRoomView_privateScope">
+        <h1>{ _t("Who are you working with?") }</h1>
+        <div className="mx_SpaceRoomView_description">
+            { _t("Make sure the right people have access to %(name)s", { name: space.name }) }
+        </div>
+
+        <AccessibleButton
+            className="mx_SpaceRoomView_privateScope_justMeButton"
+            onClick={() => { onFinished(false) }}
+        >
+            <h3>{ _t("Just me") }</h3>
+            <div>{ _t("A private space to organise your rooms") }</div>
+        </AccessibleButton>
+        <AccessibleButton
+            className="mx_SpaceRoomView_privateScope_meAndMyTeammatesButton"
+            onClick={() => { onFinished(true) }}
+        >
+            <h3>{ _t("Me and my teammates") }</h3>
+            <div>{ _t("A private space for you and your teammates") }</div>
+        </AccessibleButton>
+    </div>;
+};
+
+const validateEmailRules = withValidation({
+    rules: [{
+        key: "email",
+        test: ({ value }) => !value || Email.looksValid(value),
+        invalid: () => _t("Doesn't look like a valid email address"),
+    }],
+});
+
+const SpaceSetupPrivateInvite = ({ space, onFinished }) => {
+    const [busy, setBusy] = useState(false);
+    const [error, setError] = useState("");
+    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 name = "emailAddress" + i;
+        return <Field
+            key={name}
+            name={name}
+            type="text"
+            label={_t("Email address")}
+            placeholder={_t("Email")}
+            value={emailAddresses[i]}
+            onChange={ev => setEmailAddress(i, ev.target.value)}
+            ref={fieldRefs[i]}
+            onValidate={validateEmailRules}
+            autoFocus={i === 0}
+        />;
+    });
+
+    const onNextClick = async () => {
+        setError("");
+        for (let i = 0; i < fieldRefs.length; i++) {
+            const fieldRef = fieldRefs[i];
+            const valid = await fieldRef.current.validate({ allowEmpty: true });
+
+            if (valid === false) { // true/null are allowed
+                fieldRef.current.focus();
+                fieldRef.current.validate({ allowEmpty: true, focused: true });
+                return;
+            }
+        }
+
+        setBusy(true);
+        const targetIds = emailAddresses.map(name => name.trim()).filter(Boolean);
+        try {
+            const result = await inviteMultipleToRoom(space.roomId, targetIds);
+
+            const failedUsers = Object.keys(result.states).filter(a => result.states[a] === "error");
+            if (failedUsers.length > 0) {
+                console.log("Failed to invite users to space: ", result);
+                setError(_t("Failed to invite the following users to your space: %(csvUsers)s", {
+                    csvUsers: failedUsers.join(", "),
+                }));
+            } else {
+                onFinished();
+            }
+        } catch (err) {
+            console.error("Failed to invite users to space: ", err);
+            setError(_t("We couldn't invite those users. Please check the users you want to invite and try again."));
+        }
+        setBusy(false);
+    };
+
+    let onClick = onFinished;
+    let buttonLabel = _t("Skip for now");
+    if (emailAddresses.some(name => name.trim())) {
+        onClick = onNextClick;
+        buttonLabel = busy ? _t("Inviting...") : _t("Continue")
+    }
+
+    return <div className="mx_SpaceRoomView_inviteTeammates">
+        <h1>{ _t("Invite your teammates") }</h1>
+        <div className="mx_SpaceRoomView_description">
+            { _t("Make sure the right people have access. You can invite more later.") }
+        </div>
+
+        { error && <div className="mx_SpaceRoomView_errorText">{ error }</div> }
+        { fields }
+
+        <div className="mx_SpaceRoomView_inviteTeammates_buttons">
+            <AccessibleButton
+                className="mx_SpaceRoomView_inviteTeammates_inviteDialogButton"
+                onClick={() => showRoomInviteDialog(space.roomId)}
+            >
+                { _t("Invite by username") }
+            </AccessibleButton>
+        </div>
+
+        <div className="mx_SpaceRoomView_buttons">
+            <AccessibleButton kind="primary" disabled={busy} onClick={onClick}>
+                { buttonLabel }
+            </AccessibleButton>
+        </div>
+    </div>;
+};
+
+export default class SpaceRoomView extends React.PureComponent<IProps, IState> {
+    static contextType = MatrixClientContext;
+
+    private readonly creator: string;
+    private readonly dispatcherRef: string;
+    private readonly rightPanelStoreToken: EventSubscription;
+
+    constructor(props, context) {
+        super(props, context);
+
+        let phase = Phase.Landing;
+
+        this.creator = this.props.space.currentState.getStateEvents(EventType.RoomCreate, "")?.getSender();
+        const showSetup = this.props.justCreatedOpts && this.context.getUserId() === this.creator;
+
+        if (showSetup) {
+            phase = this.props.justCreatedOpts.createOpts.preset === Preset.PublicChat
+                ? Phase.PublicCreateRooms : Phase.PrivateScope;
+        }
+
+        this.state = {
+            phase,
+            showRightPanel: RightPanelStore.getSharedInstance().isOpenForRoom,
+            myMembership: this.props.space.getMyMembership(),
+        };
+
+        this.dispatcherRef = defaultDispatcher.register(this.onAction);
+        this.rightPanelStoreToken = RightPanelStore.getSharedInstance().addListener(this.onRightPanelStoreUpdate);
+        this.context.on("Room.myMembership", this.onMyMembership);
+    }
+
+    componentWillUnmount() {
+        defaultDispatcher.unregister(this.dispatcherRef);
+        this.rightPanelStoreToken.remove();
+        this.context.off("Room.myMembership", this.onMyMembership);
+    }
+
+    private onMyMembership = (room: Room, myMembership: string) => {
+        if (room.roomId === this.props.space.roomId) {
+            this.setState({ myMembership });
+        }
+    };
+
+    private onRightPanelStoreUpdate = () => {
+        this.setState({
+            showRightPanel: RightPanelStore.getSharedInstance().isOpenForRoom,
+        });
+    };
+
+    private onAction = (payload: ActionPayload) => {
+        if (payload.action !== Action.ViewUser && payload.action !== "view_3pid_invite") return;
+
+        if (payload.action === Action.ViewUser && payload.member) {
+            defaultDispatcher.dispatch<SetRightPanelPhasePayload>({
+                action: Action.SetRightPanelPhase,
+                phase: RightPanelPhases.SpaceMemberInfo,
+                refireParams: {
+                    space: this.props.space,
+                    member: payload.member,
+                },
+            });
+        } else if (payload.action === "view_3pid_invite" && payload.event) {
+            defaultDispatcher.dispatch<SetRightPanelPhasePayload>({
+                action: Action.SetRightPanelPhase,
+                phase: RightPanelPhases.Space3pidMemberInfo,
+                refireParams: {
+                    space: this.props.space,
+                    event: payload.event,
+                },
+            });
+        } else {
+            defaultDispatcher.dispatch<SetRightPanelPhasePayload>({
+                action: Action.SetRightPanelPhase,
+                phase: RightPanelPhases.SpaceMemberList,
+                refireParams: { space: this.props.space },
+            });
+        }
+    };
+
+    private goToFirstRoom = async () => {
+        // TODO actually go to the first room
+
+        const childRooms = SpaceStore.instance.getChildRooms(this.props.space.roomId);
+        if (childRooms.length) {
+            const room = childRooms[0];
+            defaultDispatcher.dispatch({
+                action: "view_room",
+                room_id: room.roomId,
+            });
+            return;
+        }
+
+        let suggestedRooms = SpaceStore.instance.suggestedRooms;
+        if (SpaceStore.instance.activeSpace !== this.props.space) {
+            // the space store has the suggested rooms loaded for a different space, fetch the right ones
+            suggestedRooms = (await SpaceStore.instance.fetchSuggestedRooms(this.props.space, 1)).rooms;
+        }
+
+        if (suggestedRooms.length) {
+            const room = suggestedRooms[0];
+            defaultDispatcher.dispatch({
+                action: "view_room",
+                room_id: room.room_id,
+                oobData: {
+                    avatarUrl: room.avatar_url,
+                    name: room.name || room.canonical_alias || room.aliases.pop() || _t("Empty room"),
+                },
+            });
+            return;
+        }
+
+        this.setState({ phase: Phase.Landing });
+    };
+
+    private renderBody() {
+        switch (this.state.phase) {
+            case Phase.Landing:
+                if (this.state.myMembership === "join") {
+                    return <SpaceLanding space={this.props.space} />;
+                } else {
+                    return <SpacePreview
+                        space={this.props.space}
+                        onJoinButtonClicked={this.props.onJoinButtonClicked}
+                        onRejectButtonClicked={this.props.onRejectButtonClicked}
+                    />;
+                }
+            case Phase.PublicCreateRooms:
+                return <SpaceSetupFirstRooms
+                    space={this.props.space}
+                    title={_t("What are some things you want to discuss in %(spaceName)s?", {
+                        spaceName: this.props.space.name,
+                    })}
+                    description={
+                        _t("Let's create a room for each of them.") + "\n" +
+                        _t("You can add more later too, including already existing ones.")
+                    }
+                    onFinished={() => this.setState({ phase: Phase.PublicShare })}
+                />;
+            case Phase.PublicShare:
+                return <SpaceSetupPublicShare space={this.props.space} onFinished={this.goToFirstRoom} />;
+
+            case Phase.PrivateScope:
+                return <SpaceSetupPrivateScope
+                    space={this.props.space}
+                    onFinished={(invite: boolean) => {
+                        this.setState({ phase: invite ? Phase.PrivateInvite : Phase.PrivateExistingRooms });
+                    }}
+                />;
+            case Phase.PrivateInvite:
+                return <SpaceSetupPrivateInvite
+                    space={this.props.space}
+                    onFinished={() => this.setState({ phase: Phase.PrivateCreateRooms })}
+                />;
+            case Phase.PrivateCreateRooms:
+                return <SpaceSetupFirstRooms
+                    space={this.props.space}
+                    title={_t("What projects are you working on?")}
+                    description={_t("We'll create rooms for each of them. " +
+                        "You can add more later too, including already existing ones.")}
+                    onFinished={() => this.setState({ phase: Phase.Landing })}
+                />;
+            case Phase.PrivateExistingRooms:
+                return <SpaceAddExistingRooms
+                    space={this.props.space}
+                    onFinished={() => this.setState({ phase: Phase.Landing })}
+                />;
+        }
+    }
+
+    render() {
+        const rightPanel = this.state.showRightPanel && this.state.phase === Phase.Landing
+            ? <RightPanel room={this.props.space} resizeNotifier={this.props.resizeNotifier} />
+            : null;
+
+        return <main className="mx_SpaceRoomView">
+            <ErrorBoundary>
+                <MainSplit panel={rightPanel} resizeNotifier={this.props.resizeNotifier}>
+                    { this.renderBody() }
+                </MainSplit>
+            </ErrorBoundary>
+        </main>;
+    }
+}

src/components/structures/TabbedView.tsx

@@ -20,6 +20,7 @@ import * as React from "react";
 import {_t} from '../../languageHandler';
 import * as sdk from "../../index";
 import AutoHideScrollbar from './AutoHideScrollbar';
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 /**
  * Represents a tab for the TabbedView.
@@ -45,6 +46,7 @@ interface IState {
     activeTabIndex: number;
 }
 
+@replaceableComponent("structures.TabbedView")
 export default class TabbedView extends React.Component<IProps, IState> {
     constructor(props: IProps) {
         super(props);

src/components/structures/TimelinePanel.js

@@ -22,11 +22,10 @@ import {LayoutPropType} from "../../settings/Layout";
 import React, {createRef} from 'react';
 import ReactDOM from "react-dom";
 import PropTypes from 'prop-types';
-import {EventTimeline} from "matrix-js-sdk";
-import * as Matrix from "matrix-js-sdk";
+import {EventTimeline} from "matrix-js-sdk/src/models/event-timeline";
+import {TimelineWindow} from "matrix-js-sdk/src/timeline-window";
 import { _t } from '../../languageHandler';
 import {MatrixClientPeg} from "../../MatrixClientPeg";
-import * as ObjectUtils from "../../ObjectUtils";
 import UserActivity from "../../UserActivity";
 import Modal from "../../Modal";
 import dis from "../../dispatcher/dispatcher";
@@ -37,6 +36,8 @@ import shouldHideEvent from '../../shouldHideEvent';
 import EditorStateTransfer from '../../utils/EditorStateTransfer';
 import {haveTileForEvent} from "../views/rooms/EventTile";
 import {UIFeature} from "../../settings/UIFeature";
+import {objectHasDiff} from "../../utils/objects";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 const PAGINATE_SIZE = 20;
 const INITIAL_SIZE = 20;
@@ -55,6 +56,7 @@ if (DEBUG) {
  *
  * Also responsible for handling and sending read receipts.
  */
+@replaceableComponent("structures.TimelinePanel")
 class TimelinePanel extends React.Component {
     static propTypes = {
         // The js-sdk EventTimelineSet object for the timeline sequence we are
@@ -66,6 +68,7 @@ class TimelinePanel extends React.Component {
         showReadReceipts: PropTypes.bool,
         // Enable managing RRs and RMs. These require the timelineSet to have a room.
         manageReadReceipts: PropTypes.bool,
+        sendReadReceiptOnLoad: PropTypes.bool,
         manageReadMarkers: PropTypes.bool,
 
         // true to give the component a 'display: none' style.
@@ -124,6 +127,7 @@ class TimelinePanel extends React.Component {
         // event tile heights. (See _unpaginateEvents)
         timelineCap: Number.MAX_VALUE,
         className: 'mx_RoomView_messagePanel',
+        sendReadReceiptOnLoad: true,
     };
 
     constructor(props) {
@@ -261,7 +265,7 @@ class TimelinePanel extends React.Component {
     }
 
     shouldComponentUpdate(nextProps, nextState) {
-        if (!ObjectUtils.shallowEqual(this.props, nextProps)) {
+        if (objectHasDiff(this.props, nextProps)) {
             if (DEBUG) {
                 console.group("Timeline.shouldComponentUpdate: props change");
                 console.log("props before:", this.props);
@@ -271,7 +275,7 @@ class TimelinePanel extends React.Component {
             return true;
         }
 
-        if (!ObjectUtils.shallowEqual(this.state, nextState)) {
+        if (objectHasDiff(this.state, nextState)) {
             if (DEBUG) {
                 console.group("Timeline.shouldComponentUpdate: state change");
                 console.log("state before:", this.state);
@@ -461,6 +465,9 @@ class TimelinePanel extends React.Component {
                 }
             });
         }
+        if (payload.action === "scroll_to_bottom") {
+            this.jumpToLiveTimeline();
+        }
     };
 
     onRoomTimeline = (ev, room, toStartOfTimeline, removed, data) => {
@@ -780,8 +787,10 @@ class TimelinePanel extends React.Component {
             return;
         }
         const lastDisplayedEvent = this.state.events[lastDisplayedIndex];
-        this._setReadMarker(lastDisplayedEvent.getId(),
-                            lastDisplayedEvent.getTs());
+        this._setReadMarker(
+            lastDisplayedEvent.getId(),
+            lastDisplayedEvent.getTs(),
+        );
 
         // the read-marker should become invisible, so that if the user scrolls
         // down, they don't see it.
@@ -867,7 +876,7 @@ class TimelinePanel extends React.Component {
             // The messagepanel knows where the RM is, so we must have loaded
             // the relevant event.
             this._messagePanel.current.scrollToEvent(this.state.readMarkerEventId,
-                                                 0, 1/3);
+                0, 1/3);
             return;
         }
 
@@ -1005,7 +1014,7 @@ class TimelinePanel extends React.Component {
      * returns a promise which will resolve when the load completes.
      */
     _loadTimeline(eventId, pixelOffset, offsetBase) {
-        this._timelineWindow = new Matrix.TimelineWindow(
+        this._timelineWindow = new TimelineWindow(
             MatrixClientPeg.get(), this.props.timelineSet,
             {windowLimit: this.props.timelineCap});
 
@@ -1039,12 +1048,14 @@ class TimelinePanel extends React.Component {
                 }
                 if (eventId) {
                     this._messagePanel.current.scrollToEvent(eventId, pixelOffset,
-                                                         offsetBase);
+                        offsetBase);
                 } else {
                     this._messagePanel.current.scrollToBottom();
                 }
 
-                this.sendReadReceipt();
+                if (this.props.sendReadReceiptOnLoad) {
+                    this.sendReadReceipt();
+                }
             });
         };
 
@@ -1413,8 +1424,8 @@ class TimelinePanel extends React.Component {
             ['PREPARED', 'CATCHUP'].includes(this.state.clientSyncState)
         );
         const events = this.state.firstVisibleEventIndex
-              ? this.state.events.slice(this.state.firstVisibleEventIndex)
-              : this.state.events;
+            ? this.state.events.slice(this.state.firstVisibleEventIndex)
+            : this.state.events;
         return (
             <MessagePanel
                 ref={this._messagePanel}

src/components/structures/ToastContainer.tsx

@@ -17,12 +17,14 @@ limitations under the License.
 import * as React from "react";
 import ToastStore, {IToast} from "../../stores/ToastStore";
 import classNames from "classnames";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 interface IState {
     toasts: IToast<any>[];
     countSeen: number;
 }
 
+@replaceableComponent("structures.ToastContainer")
 export default class ToastContainer extends React.Component<{}, IState> {
     constructor(props, context) {
         super(props, context);

src/components/structures/UploadBar.js

@@ -1,109 +0,0 @@
-/*
-Copyright 2015, 2016 OpenMarket Ltd
-Copyright 2019 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 from 'react';
-import PropTypes from 'prop-types';
-import ContentMessages from '../../ContentMessages';
-import dis from "../../dispatcher/dispatcher";
-import filesize from "filesize";
-import { _t } from '../../languageHandler';
-
-export default class UploadBar extends React.Component {
-    static propTypes = {
-        room: PropTypes.object,
-    };
-
-    componentDidMount() {
-        this.dispatcherRef = dis.register(this.onAction);
-        this.mounted = true;
-    }
-
-    componentWillUnmount() {
-        this.mounted = false;
-        dis.unregister(this.dispatcherRef);
-    }
-
-    onAction = payload => {
-        switch (payload.action) {
-            case 'upload_progress':
-            case 'upload_finished':
-            case 'upload_canceled':
-            case 'upload_failed':
-                if (this.mounted) this.forceUpdate();
-                break;
-        }
-    };
-
-    render() {
-        const uploads = ContentMessages.sharedInstance().getCurrentUploads();
-
-        // for testing UI... - also fix up the ContentMessages.getCurrentUploads().length
-        // check in RoomView
-        //
-        // uploads = [{
-        //     roomId: this.props.room.roomId,
-        //     loaded: 123493,
-        //     total: 347534,
-        //     fileName: "testing_fooble.jpg",
-        // }];
-
-        if (uploads.length == 0) {
-            return <div />;
-        }
-
-        let upload;
-        for (let i = 0; i < uploads.length; ++i) {
-            if (uploads[i].roomId == this.props.room.roomId) {
-                upload = uploads[i];
-                break;
-            }
-        }
-        if (!upload) {
-            return <div />;
-        }
-
-        const innerProgressStyle = {
-            width: ((upload.loaded / (upload.total || 1)) * 100) + '%',
-        };
-        let uploadedSize = filesize(upload.loaded);
-        const totalSize = filesize(upload.total);
-        if (uploadedSize.replace(/^.* /, '') === totalSize.replace(/^.* /, '')) {
-            uploadedSize = uploadedSize.replace(/ .*/, '');
-        }
-
-        // MUST use var name 'count' for pluralization to kick in
-        const uploadText = _t(
-            "Uploading %(filename)s and %(count)s others", {filename: upload.fileName, count: (uploads.length - 1)},
-        );
-
-        return (
-            <div className="mx_UploadBar">
-                <div className="mx_UploadBar_uploadProgressOuter">
-                    <div className="mx_UploadBar_uploadProgressInner" style={innerProgressStyle}></div>
-                </div>
-                <img className="mx_UploadBar_uploadIcon mx_filterFlipColor" src={require("../../../res/img/fileicon.png")} width="17" height="22" />
-                <img className="mx_UploadBar_uploadCancel mx_filterFlipColor" src={require("../../../res/img/cancel.svg")} width="18" height="18"
-                    onClick={function() { ContentMessages.sharedInstance().cancelUpload(upload.promise); }}
-                />
-                <div className="mx_UploadBar_uploadBytes">
-                    { uploadedSize } / { totalSize }
-                </div>
-                <div className="mx_UploadBar_uploadFilename">{ uploadText }</div>
-            </div>
-        );
-    }
-}

src/components/structures/UploadBar.tsx

@@ -0,0 +1,110 @@
+/*
+Copyright 2015, 2016, 2019, 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 from 'react';
+import { Room } from "matrix-js-sdk/src/models/room";
+import ContentMessages from '../../ContentMessages';
+import dis from "../../dispatcher/dispatcher";
+import filesize from "filesize";
+import { _t } from '../../languageHandler';
+import { ActionPayload } from "../../dispatcher/payloads";
+import { Action } from "../../dispatcher/actions";
+import ProgressBar from "../views/elements/ProgressBar";
+import AccessibleButton from "../views/elements/AccessibleButton";
+import { IUpload } from "../../models/IUpload";
+import {replaceableComponent} from "../../utils/replaceableComponent";
+
+interface IProps {
+    room: Room;
+}
+
+interface IState {
+    currentUpload?: IUpload;
+    uploadsHere: IUpload[];
+}
+
+@replaceableComponent("structures.UploadBar")
+export default class UploadBar extends React.Component<IProps, IState> {
+    private dispatcherRef: string;
+    private mounted: boolean;
+
+    constructor(props) {
+        super(props);
+
+        // Set initial state to any available upload in this room - we might be mounting
+        // earlier than the first progress event, so should show something relevant.
+        const uploadsHere = this.getUploadsInRoom();
+        this.state = {currentUpload: uploadsHere[0], uploadsHere};
+    }
+
+    componentDidMount() {
+        this.dispatcherRef = dis.register(this.onAction);
+        this.mounted = true;
+    }
+
+    componentWillUnmount() {
+        this.mounted = false;
+        dis.unregister(this.dispatcherRef);
+    }
+
+    private getUploadsInRoom(): IUpload[] {
+        const uploads = ContentMessages.sharedInstance().getCurrentUploads();
+        return uploads.filter(u => u.roomId === this.props.room.roomId);
+    }
+
+    private onAction = (payload: ActionPayload) => {
+        switch (payload.action) {
+            case Action.UploadStarted:
+            case Action.UploadProgress:
+            case Action.UploadFinished:
+            case Action.UploadCanceled:
+            case Action.UploadFailed: {
+                if (!this.mounted) return;
+                const uploadsHere = this.getUploadsInRoom();
+                this.setState({currentUpload: uploadsHere[0], uploadsHere});
+                break;
+            }
+        }
+    };
+
+    private onCancelClick = (ev) => {
+        ev.preventDefault();
+        ContentMessages.sharedInstance().cancelUpload(this.state.currentUpload.promise);
+    };
+
+    render() {
+        if (!this.state.currentUpload) {
+            return null;
+        }
+
+        // MUST use var name 'count' for pluralization to kick in
+        const uploadText = _t(
+            "Uploading %(filename)s and %(count)s others", {
+                filename: this.state.currentUpload.fileName,
+                count: this.state.uploadsHere.length - 1,
+            },
+        );
+
+        const uploadSize = filesize(this.state.currentUpload.total);
+        return (
+            <div className="mx_UploadBar">
+                <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

@@ -15,13 +15,18 @@ limitations under the License.
 */
 
 import React, { createRef } from "react";
+import { Room } from "matrix-js-sdk/src/models/room";
+import classNames from "classnames";
+import * as fbEmitter from "fbemitter";
+
 import { MatrixClientPeg } from "../../MatrixClientPeg";
 import defaultDispatcher from "../../dispatcher/dispatcher";
+import dis from "../../dispatcher/dispatcher";
 import { ActionPayload } from "../../dispatcher/payloads";
 import { Action } from "../../dispatcher/actions";
 import { _t } from "../../languageHandler";
 import { ContextMenuButton } from "./ContextMenu";
-import {USER_NOTIFICATIONS_TAB, USER_SECURITY_TAB} from "../views/dialogs/UserSettingsDialog";
+import { USER_NOTIFICATIONS_TAB, USER_SECURITY_TAB } from "../views/dialogs/UserSettingsDialog";
 import { OpenToTabPayload } from "../../dispatcher/payloads/OpenToTabPayload";
 import FeedbackDialog from "../views/dialogs/FeedbackDialog";
 import Modal from "../../Modal";
@@ -30,11 +35,10 @@ import SettingsStore from "../../settings/SettingsStore";
 import {getCustomTheme} from "../../theme";
 import AccessibleButton, {ButtonEvent} from "../views/elements/AccessibleButton";
 import SdkConfig from "../../SdkConfig";
-import {getHomePageUrl} from "../../utils/pages";
+import { getHomePageUrl } from "../../utils/pages";
 import { OwnProfileStore } from "../../stores/OwnProfileStore";
 import { UPDATE_EVENT } from "../../stores/AsyncStore";
 import BaseAvatar from '../views/avatars/BaseAvatar';
-import classNames from "classnames";
 import AccessibleTooltipButton from "../views/elements/AccessibleTooltipButton";
 import { SettingLevel } from "../../settings/SettingLevel";
 import IconizedContextMenu, {
@@ -42,16 +46,17 @@ import IconizedContextMenu, {
     IconizedContextMenuOptionList,
 } from "../views/context_menus/IconizedContextMenu";
 import { CommunityPrototypeStore } from "../../stores/CommunityPrototypeStore";
-import * as fbEmitter from "fbemitter";
 import GroupFilterOrderStore from "../../stores/GroupFilterOrderStore";
 import { showCommunityInviteDialog } from "../../RoomInvite";
-import dis from "../../dispatcher/dispatcher";
 import { RightPanelPhases } from "../../stores/RightPanelStorePhases";
 import ErrorDialog from "../views/dialogs/ErrorDialog";
 import EditCommunityPrototypeDialog from "../views/dialogs/EditCommunityPrototypeDialog";
-import {UIFeature} from "../../settings/UIFeature";
+import { UIFeature } from "../../settings/UIFeature";
 import HostSignupAction from "./HostSignupAction";
-import {IHostSignupConfig} from "../views/dialogs/HostSignupDialogTypes";
+import { IHostSignupConfig } from "../views/dialogs/HostSignupDialogTypes";
+import SpaceStore, { UPDATE_SELECTED_SPACE } from "../../stores/SpaceStore";
+import RoomName from "../views/elements/RoomName";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 interface IProps {
     isMinimized: boolean;
@@ -62,11 +67,14 @@ type PartialDOMRect = Pick<DOMRect, "width" | "left" | "top" | "height">;
 interface IState {
     contextMenuPosition: PartialDOMRect;
     isDarkTheme: boolean;
+    selectedSpace?: Room;
 }
 
+@replaceableComponent("structures.UserMenu")
 export default class UserMenu extends React.Component<IProps, IState> {
     private dispatcherRef: string;
     private themeWatcherRef: string;
+    private dndWatcherRef: string;
     private buttonRef: React.RefObject<HTMLButtonElement> = createRef();
     private tagStoreRef: fbEmitter.EventSubscription;
 
@@ -79,6 +87,12 @@ export default class UserMenu extends React.Component<IProps, IState> {
         };
 
         OwnProfileStore.instance.on(UPDATE_EVENT, this.onProfileUpdate);
+        if (SettingsStore.getValue("feature_spaces")) {
+            SpaceStore.instance.on(UPDATE_SELECTED_SPACE, this.onSelectedSpaceUpdate);
+        }
+
+        // Force update is the easiest way to trigger the UI update (we don't store state for this)
+        this.dndWatcherRef = SettingsStore.watchSetting("doNotDisturb", null, () => this.forceUpdate());
     }
 
     private get hasHomePage(): boolean {
@@ -93,9 +107,13 @@ export default class UserMenu extends React.Component<IProps, IState> {
 
     public componentWillUnmount() {
         if (this.themeWatcherRef) SettingsStore.unwatchSetting(this.themeWatcherRef);
+        if (this.dndWatcherRef) SettingsStore.unwatchSetting(this.dndWatcherRef);
         if (this.dispatcherRef) defaultDispatcher.unregister(this.dispatcherRef);
         OwnProfileStore.instance.off(UPDATE_EVENT, this.onProfileUpdate);
         this.tagStoreRef.remove();
+        if (SettingsStore.getValue("feature_spaces")) {
+            SpaceStore.instance.off(UPDATE_SELECTED_SPACE, this.onSelectedSpaceUpdate);
+        }
     }
 
     private onTagStoreUpdate = () => {
@@ -103,11 +121,15 @@ export default class UserMenu extends React.Component<IProps, IState> {
     };
 
     private isUserOnDarkTheme(): boolean {
-        const theme = SettingsStore.getValue("theme");
-        if (theme.startsWith("custom-")) {
-            return getCustomTheme(theme.substring("custom-".length)).is_dark;
+        if (SettingsStore.getValue("use_system_theme")) {
+            return window.matchMedia("(prefers-color-scheme: dark)").matches;
+        } else {
+            const theme = SettingsStore.getValue("theme");
+            if (theme.startsWith("custom-")) {
+                return getCustomTheme(theme.substring("custom-".length)).is_dark;
+            }
+            return theme === "dark";
         }
-        return theme === "dark";
     }
 
     private onProfileUpdate = async () => {
@@ -116,6 +138,10 @@ export default class UserMenu extends React.Component<IProps, IState> {
         this.forceUpdate();
     };
 
+    private onSelectedSpaceUpdate = async (selectedSpace?: Room) => {
+        this.setState({ selectedSpace });
+    };
+
     private onThemeChanged = () => {
         this.setState({isDarkTheme: this.isUserOnDarkTheme()});
     };
@@ -267,6 +293,12 @@ export default class UserMenu extends React.Component<IProps, IState> {
         this.setState({contextMenuPosition: null}); // also close the menu
     };
 
+    private onDndToggle = (ev) => {
+        ev.stopPropagation();
+        const current = SettingsStore.getValue("doNotDisturb");
+        SettingsStore.setValue("doNotDisturb", null, SettingLevel.DEVICE, !current);
+    };
+
     private renderContextMenu = (): React.ReactNode => {
         if (!this.state.contextMenuPosition) return null;
 
@@ -513,7 +545,17 @@ export default class UserMenu extends React.Component<IProps, IState> {
                 {/* masked image in CSS */}
             </span>
         );
-        if (prototypeCommunityName) {
+        let dnd;
+        if (this.state.selectedSpace) {
+            name = (
+                <div className="mx_UserMenu_doubleName">
+                    <span className="mx_UserMenu_userName">{displayName}</span>
+                    <RoomName room={this.state.selectedSpace}>
+                        {(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>
@@ -530,6 +572,16 @@ export default class UserMenu extends React.Component<IProps, IState> {
                 </div>
             );
             isPrototype = true;
+        } else if (SettingsStore.getValue("feature_dnd")) {
+            const isDnd = SettingsStore.getValue("doNotDisturb");
+            dnd = <AccessibleButton
+                onClick={this.onDndToggle}
+                className={classNames({
+                    "mx_UserMenu_dnd": true,
+                    "mx_UserMenu_dnd_noisy": !isDnd,
+                    "mx_UserMenu_dnd_muted": isDnd,
+                })}
+            />;
         }
         if (this.props.isMinimized) {
             name = null;
@@ -565,6 +617,7 @@ export default class UserMenu extends React.Component<IProps, IState> {
                             />
                         </span>
                         {name}
+                        {dnd}
                         {buttons}
                     </div>
                 </ContextMenuButton>

src/components/structures/UserView.js

@@ -17,13 +17,16 @@ limitations under the License.
 
 import React from "react";
 import PropTypes from "prop-types";
-import Matrix from "matrix-js-sdk";
 import {MatrixClientPeg} from "../../MatrixClientPeg";
 import * as sdk from "../../index";
 import Modal from '../../Modal';
 import { _t } from '../../languageHandler';
 import HomePage from "./HomePage";
+import {replaceableComponent} from "../../utils/replaceableComponent";
+import {MatrixEvent} from "matrix-js-sdk/src/models/event";
+import {RoomMember} from "matrix-js-sdk/src/models/room-member";
 
+@replaceableComponent("structures.UserView")
 export default class UserView extends React.Component {
     static get propTypes() {
         return {
@@ -66,8 +69,8 @@ export default class UserView extends React.Component {
             this.setState({loading: false});
             return;
         }
-        const fakeEvent = new Matrix.MatrixEvent({type: "m.room.member", content: profileInfo});
-        const member = new Matrix.RoomMember(null, this.props.userId);
+        const fakeEvent = new MatrixEvent({type: "m.room.member", content: profileInfo});
+        const member = new RoomMember(null, this.props.userId);
         member.setMembershipEvent(fakeEvent);
         this.setState({member, loading: false});
     }

src/components/structures/ViewSource.js

@@ -16,34 +16,176 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import React from 'react';
-import PropTypes from 'prop-types';
-import SyntaxHighlight from '../views/elements/SyntaxHighlight';
-import {_t} from "../../languageHandler";
+import React from "react";
+import PropTypes from "prop-types";
+import SyntaxHighlight from "../views/elements/SyntaxHighlight";
+import { _t } from "../../languageHandler";
 import * as sdk from "../../index";
+import MatrixClientContext from "../../contexts/MatrixClientContext";
+import { SendCustomEvent } from "../views/dialogs/DevtoolsDialog";
+import { canEditContent } from "../../utils/EventUtils";
+import { MatrixClientPeg } from '../../MatrixClientPeg';
+import { replaceableComponent } from "../../utils/replaceableComponent";
 
-
+@replaceableComponent("structures.ViewSource")
 export default class ViewSource extends React.Component {
     static propTypes = {
-        content: PropTypes.object.isRequired,
         onFinished: PropTypes.func.isRequired,
-        roomId: PropTypes.string.isRequired,
-        eventId: PropTypes.string.isRequired,
+        mxEvent: PropTypes.object.isRequired, // the MatrixEvent associated with the context menu
     };
 
-    render() {
-        const BaseDialog = sdk.getComponent('views.dialogs.BaseDialog');
-        return (
-            <BaseDialog className="mx_ViewSource" onFinished={this.props.onFinished} title={_t('View Source')}>
-                <div className="mx_ViewSource_label_left">Room ID: { this.props.roomId }</div>
-                <div className="mx_ViewSource_label_right">Event ID: { this.props.eventId }</div>
-                <div className="mx_ViewSource_label_bottom" />
+    constructor(props) {
+        super(props);
 
-                <div className="mx_Dialog_content">
-                    <SyntaxHighlight className="json">
-                        { JSON.stringify(this.props.content, null, 2) }
-                    </SyntaxHighlight>
+        this.state = {
+            isEditing: false,
+        };
+    }
+
+    onBack() {
+        // TODO: refresh the "Event ID:" modal header
+        this.setState({ isEditing: false });
+    }
+
+    onEdit() {
+        this.setState({ isEditing: true });
+    }
+
+    // returns the dialog body for viewing the event source
+    viewSourceContent() {
+        const mxEvent = this.props.mxEvent.replacingEvent() || this.props.mxEvent; // show the replacing event, not the original, if it is an edit
+        const isEncrypted = mxEvent.isEncrypted();
+        const decryptedEventSource = mxEvent._clearEvent; // FIXME: _clearEvent is private
+        const originalEventSource = mxEvent.event;
+
+        if (isEncrypted) {
+            return (
+                <>
+                    <details open className="mx_ViewSource_details">
+                        <summary>
+                            <span className="mx_ViewSource_heading">{_t("Decrypted event source")}</span>
+                        </summary>
+                        <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>
+                        </summary>
+                        <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>
+                </>
+            );
+        }
+    }
+
+    // returns the id of the initial message, not the id of the previous edit
+    getBaseEventId() {
+        const mxEvent = this.props.mxEvent.replacingEvent() || this.props.mxEvent; // show the replacing event, not the original, if it is an edit
+        const isEncrypted = mxEvent.isEncrypted();
+        const baseMxEvent = this.props.mxEvent;
+
+        if (isEncrypted) {
+            // `relates_to` field is inside the encrypted event
+            return mxEvent.event.content["m.relates_to"]?.event_id ?? baseMxEvent.getId();
+        } else {
+            return mxEvent.getContent()["m.relates_to"]?.event_id ?? baseMxEvent.getId();
+        }
+    }
+
+    // returns the SendCustomEvent component prefilled with the correct details
+    editSourceContent() {
+        const mxEvent = this.props.mxEvent.replacingEvent() || this.props.mxEvent; // show the replacing event, not the original, if it is an edit
+
+        const isStateEvent = mxEvent.isState();
+        const roomId = mxEvent.getRoomId();
+        const originalContent = mxEvent.getContent();
+
+        if (isStateEvent) {
+            return (
+                <MatrixClientContext.Consumer>
+                    {(cli) => (
+                        <SendCustomEvent
+                            room={cli.getRoom(roomId)}
+                            forceStateEvent={true}
+                            onBack={() => this.onBack()}
+                            inputs={{
+                                eventType: mxEvent.getType(),
+                                evContent: JSON.stringify(originalContent, null, "\t"),
+                                stateKey: mxEvent.getStateKey(),
+                            }}
+                        />
+                    )}
+                </MatrixClientContext.Consumer>
+            );
+        } else {
+            // prefill an edit-message event
+            // keep only the `body` and `msgtype` fields of originalContent
+            const bodyToStartFrom = originalContent["m.new_content"]?.body ?? originalContent.body; // prefill the last edit body, to start editing from there
+            const newContent = {
+                "body": ` * ${bodyToStartFrom}`,
+                "msgtype": originalContent.msgtype,
+                "m.new_content": {
+                    body: bodyToStartFrom,
+                    msgtype: originalContent.msgtype,
+                },
+                "m.relates_to": {
+                    rel_type: "m.replace",
+                    event_id: this.getBaseEventId(),
+                },
+            };
+            return (
+                <MatrixClientContext.Consumer>
+                    {(cli) => (
+                        <SendCustomEvent
+                            room={cli.getRoom(roomId)}
+                            forceStateEvent={false}
+                            forceGeneralEvent={true}
+                            onBack={() => this.onBack()}
+                            inputs={{
+                                eventType: mxEvent.getType(),
+                                evContent: JSON.stringify(newContent, null, "\t"),
+                            }}
+                        />
+                    )}
+                </MatrixClientContext.Consumer>
+            );
+        }
+    }
+
+    canSendStateEvent(mxEvent) {
+        const cli = MatrixClientPeg.get();
+        const room = cli.getRoom(mxEvent.getRoomId());
+        return room.currentState.mayClientSendStateEvent(mxEvent.getType(), cli);
+    }
+
+    render() {
+        const BaseDialog = sdk.getComponent("views.dialogs.BaseDialog");
+        const mxEvent = this.props.mxEvent.replacingEvent() || this.props.mxEvent; // show the replacing event, not the original, if it is an edit
+
+        const isEditing = this.state.isEditing;
+        const roomId = mxEvent.getRoomId();
+        const eventId = mxEvent.getId();
+        const canEdit = mxEvent.isState() ? this.canSendStateEvent(mxEvent) : canEditContent(this.props.mxEvent);
+        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 className="mx_ViewSource_separator" />
+                    {isEditing ? this.editSourceContent() : this.viewSourceContent()}
                 </div>
+                {!isEditing && canEdit && (
+                    <div className="mx_Dialog_buttons">
+                        <button onClick={() => this.onEdit()}>{_t("Edit")}</button>
+                    </div>
+                )}
             </BaseDialog>
         );
     }

src/components/structures/auth/CompleteSecurity.js

@@ -20,13 +20,16 @@ import { _t } from '../../../languageHandler';
 import * as sdk from '../../../index';
 import {
     SetupEncryptionStore,
+    PHASE_LOADING,
     PHASE_INTRO,
     PHASE_BUSY,
     PHASE_DONE,
     PHASE_CONFIRM_SKIP,
 } from '../../../stores/SetupEncryptionStore';
 import SetupEncryptionBody from "./SetupEncryptionBody";
+import {replaceableComponent} from "../../../utils/replaceableComponent";
 
+@replaceableComponent("structures.auth.CompleteSecurity")
 export default class CompleteSecurity extends React.Component {
     static propTypes = {
         onFinished: PropTypes.func.isRequired,
@@ -58,7 +61,9 @@ export default class CompleteSecurity extends React.Component {
         let icon;
         let title;
 
-        if (phase === PHASE_INTRO) {
+        if (phase === PHASE_LOADING) {
+            return null;
+        } else if (phase === PHASE_INTRO) {
             icon = <span className="mx_CompleteSecurity_headerIcon mx_E2EIcon_warning" />;
             title = _t("Verify this login");
         } else if (phase === PHASE_DONE) {

src/components/structures/auth/E2eSetup.js

@@ -19,7 +19,9 @@ import PropTypes from 'prop-types';
 import AuthPage from '../../views/auth/AuthPage';
 import CompleteSecurityBody from '../../views/auth/CompleteSecurityBody';
 import CreateCrossSigningDialog from '../../views/dialogs/security/CreateCrossSigningDialog';
+import {replaceableComponent} from "../../../utils/replaceableComponent";
 
+@replaceableComponent("structures.auth.E2eSetup")
 export default class E2eSetup extends React.Component {
     static propTypes = {
         onFinished: PropTypes.func.isRequired,

src/components/structures/auth/ForgotPassword.js

@@ -18,7 +18,7 @@ limitations under the License.
 
 import React from 'react';
 import PropTypes from 'prop-types';
-import { _t } from '../../../languageHandler';
+import { _t, _td } from '../../../languageHandler';
 import * as sdk from '../../../index';
 import Modal from "../../../Modal";
 import PasswordReset from "../../../PasswordReset";
@@ -27,6 +27,9 @@ import classNames from 'classnames';
 import AuthPage from "../../views/auth/AuthPage";
 import CountlyAnalytics from "../../../CountlyAnalytics";
 import ServerPicker from "../../views/elements/ServerPicker";
+import PassphraseField from '../../views/auth/PassphraseField';
+import {replaceableComponent} from "../../../utils/replaceableComponent";
+import { PASSWORD_MIN_SCORE } from '../../views/auth/RegistrationForm';
 
 // Phases
 // Show the forgot password inputs
@@ -38,6 +41,7 @@ const PHASE_EMAIL_SENT = 3;
 // User has clicked the link in email and completed reset
 const PHASE_DONE = 4;
 
+@replaceableComponent("structures.auth.ForgotPassword")
 export default class ForgotPassword extends React.Component {
     static propTypes = {
         serverConfig: PropTypes.instanceOf(ValidatedServerConfig).isRequired,
@@ -135,10 +139,14 @@ export default class ForgotPassword extends React.Component {
         // refresh the server errors, just in case the server came back online
         await this._checkServerLiveliness(this.props.serverConfig);
 
+        await this['password_field'].validate({ allowEmpty: false });
+
         if (!this.state.email) {
             this.showErrorDialog(_t('The email address linked to your account must be entered.'));
         } else if (!this.state.password || !this.state.password2) {
             this.showErrorDialog(_t('A new password must be entered.'));
+        } else if (!this.state.passwordFieldValid) {
+            this.showErrorDialog(_t('Please choose a strong password'));
         } else if (this.state.password !== this.state.password2) {
             this.showErrorDialog(_t('New passwords must match each other.'));
         } else {
@@ -184,6 +192,12 @@ export default class ForgotPassword extends React.Component {
         });
     }
 
+    onPasswordValidate(result) {
+        this.setState({
+            passwordFieldValid: result.valid,
+        });
+    }
+
     renderForgot() {
         const Field = sdk.getComponent('elements.Field');
 
@@ -228,12 +242,15 @@ export default class ForgotPassword extends React.Component {
                     />
                 </div>
                 <div className="mx_AuthBody_fieldRow">
-                    <Field
+                    <PassphraseField
                         name="reset_password"
                         type="password"
-                        label={_t('New Password')}
+                        label={_td('New Password')}
                         value={this.state.password}
+                        minScore={PASSWORD_MIN_SCORE}
                         onChange={this.onInputChanged.bind(this, "password")}
+                        fieldRef={field => this['password_field'] = field}
+                        onValidate={(result) => this.onPasswordValidate(result)}
                         onFocus={() => CountlyAnalytics.instance.track("onboarding_forgot_password_newPassword_focus")}
                         onBlur={() => CountlyAnalytics.instance.track("onboarding_forgot_password_newPassword_blur")}
                         autoComplete="new-password"

src/components/structures/auth/Login.tsx

@@ -1,5 +1,5 @@
 /*
-Copyright 2015, 2016, 2017, 2018, 2019 The Matrix.org Foundation C.I.C.
+Copyright 2015-2021 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.
@@ -35,6 +35,7 @@ import InlineSpinner from "../../views/elements/InlineSpinner";
 import Spinner from "../../views/elements/Spinner";
 import SSOButtons from "../../views/elements/SSOButtons";
 import ServerPicker from "../../views/elements/ServerPicker";
+import {replaceableComponent} from "../../../utils/replaceableComponent";
 
 // These are used in several places, and come from the js-sdk's autodiscovery
 // stuff. We define them here so that they'll be picked up by i18n.
@@ -93,12 +94,13 @@ interface IState {
     // be seeing.
     serverIsAlive: boolean;
     serverErrorIsFatal: boolean;
-    serverDeadError: string;
+    serverDeadError?: ReactNode;
 }
 
 /*
  * A wire component which glues together login UI components and Login logic
  */
+@replaceableComponent("structures.auth.LoginComponent")
 export default class LoginComponent extends React.PureComponent<IProps, IState> {
     private unmounted = false;
     private loginLogic: Login;
@@ -218,6 +220,9 @@ export default class LoginComponent extends React.PureComponent<IProps, IState>
                         'monthly_active_user': _td(
                             "This homeserver has hit its Monthly Active User limit.",
                         ),
+                        'hs_blocked': _td(
+                            "This homeserver has been blocked by it's administrator.",
+                        ),
                         '': _td(
                             "This homeserver has exceeded one of its resource limits.",
                         ),

src/components/structures/auth/Registration.tsx

@@ -1,5 +1,5 @@
 /*
-Copyright 2015, 2016, 2017, 2018, 2019, 2020 The Matrix.org Foundation C.I.C.
+Copyright 2015-2021 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.
@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import Matrix from 'matrix-js-sdk';
+import {createClient} from 'matrix-js-sdk/src/matrix';
 import React, {ReactNode} from 'react';
 import {MatrixClient} from "matrix-js-sdk/src/client";
 
@@ -30,6 +30,7 @@ import Login, {ISSOFlow} from "../../../Login";
 import dis from "../../../dispatcher/dispatcher";
 import SSOButtons from "../../views/elements/SSOButtons";
 import ServerPicker from '../../views/elements/ServerPicker';
+import {replaceableComponent} from "../../../utils/replaceableComponent";
 
 interface IProps {
     serverConfig: ValidatedServerConfig;
@@ -94,7 +95,7 @@ interface IState {
     // be seeing.
     serverIsAlive: boolean;
     serverErrorIsFatal: boolean;
-    serverDeadError: string;
+    serverDeadError?: ReactNode;
 
     // Our matrix client - part of state because we can't render the UI auth
     // component without it.
@@ -109,6 +110,7 @@ interface IState {
     ssoFlow?: ISSOFlow;
 }
 
+@replaceableComponent("structures.auth.Registration")
 export default class Registration extends React.Component<IProps, IState> {
     loginLogic: Login;
 
@@ -179,7 +181,7 @@ export default class Registration extends React.Component<IProps, IState> {
         }
 
         const {hsUrl, isUrl} = serverConfig;
-        const cli = Matrix.createClient({
+        const cli = createClient({
             baseUrl: hsUrl,
             idBaseUrl: isUrl,
         });
@@ -276,6 +278,7 @@ export default class Registration extends React.Component<IProps, IState> {
                     response.data.admin_contact,
                     {
                         'monthly_active_user': _td("This homeserver has hit its Monthly Active User limit."),
+                        'hs_blocked': _td("This homeserver has been blocked by it's administrator."),
                         '': _td("This homeserver has exceeded one of its resource limits."),
                     },
                 );
@@ -433,6 +436,8 @@ export default class Registration extends React.Component<IProps, IState> {
             // ok fine, there's still no session: really go to the login page
             this.props.onLoginClick();
         }
+
+        return sessionLoaded;
     };
 
     private renderRegisterComponent() {
@@ -554,7 +559,12 @@ export default class Registration extends React.Component<IProps, IState> {
                             loggedInUserId: this.state.differentLoggedInUserId,
                         },
                     )}</p>
-                    <p><AccessibleButton element="span" className="mx_linkButton" onClick={this.onLoginClickWithCheck}>
+                    <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>;

src/components/structures/auth/SetupEncryptionBody.js

@@ -17,17 +17,20 @@ limitations under the License.
 import React from 'react';
 import PropTypes from 'prop-types';
 import { _t } from '../../../languageHandler';
-import SdkConfig from '../../../SdkConfig';
 import { MatrixClientPeg } from '../../../MatrixClientPeg';
+import Modal from '../../../Modal';
+import VerificationRequestDialog from '../../views/dialogs/VerificationRequestDialog';
 import * as sdk from '../../../index';
 import {
     SetupEncryptionStore,
+    PHASE_LOADING,
     PHASE_INTRO,
     PHASE_BUSY,
     PHASE_DONE,
     PHASE_CONFIRM_SKIP,
     PHASE_FINISHED,
 } from '../../../stores/SetupEncryptionStore';
+import {replaceableComponent} from "../../../utils/replaceableComponent";
 
 function keyHasPassphrase(keyInfo) {
     return (
@@ -37,6 +40,7 @@ function keyHasPassphrase(keyInfo) {
     );
 }
 
+@replaceableComponent("structures.auth.SetupEncryptionBody")
 export default class SetupEncryptionBody extends React.Component {
     static propTypes = {
         onFinished: PropTypes.func.isRequired,
@@ -81,6 +85,22 @@ export default class SetupEncryptionBody extends React.Component {
         store.usePassPhrase();
     }
 
+    _onVerifyClick = () => {
+        const cli = MatrixClientPeg.get();
+        const userId = cli.getUserId();
+        const requestPromise = cli.requestVerification(userId);
+
+        this.props.onFinished(true);
+        Modal.createTrackedDialog('New Session Verification', 'Starting dialog', VerificationRequestDialog, {
+            verificationRequestPromise: requestPromise,
+            member: cli.getUser(userId),
+            onFinished: async () => {
+                const request = await requestPromise;
+                request.cancel();
+            },
+        });
+    }
+
     onSkipClick = () => {
         const store = SetupEncryptionStore.sharedInstance();
         store.skip();
@@ -132,32 +152,21 @@ export default class SetupEncryptionBody extends React.Component {
                 </AccessibleButton>;
             }
 
-            const brand = SdkConfig.get().brand;
+            let verifyButton;
+            if (store.hasDevicesToVerifyAgainst) {
+                verifyButton = <AccessibleButton kind="primary" onClick={this._onVerifyClick}>
+                    { _t("Use another login") }
+                </AccessibleButton>;
+            }
 
             return (
                 <div>
                     <p>{_t(
-                        "Confirm your identity by verifying this login from one of your other sessions, " +
-                        "granting it access to encrypted messages.",
+                        "Verify your identity to access encrypted messages and prove your identity to others.",
                     )}</p>
-                    <p>{_t(
-                        "This requires the latest %(brand)s on your other devices:",
-                        { brand },
-                    )}</p>
-
-                    <div className="mx_CompleteSecurity_clients">
-                        <div className="mx_CompleteSecurity_clients_desktop">
-                            <div>{_t("%(brand)s Web", { brand })}</div>
-                            <div>{_t("%(brand)s Desktop", { brand })}</div>
-                        </div>
-                        <div className="mx_CompleteSecurity_clients_mobile">
-                            <div>{_t("%(brand)s iOS", { brand })}</div>
-                            <div>{_t("%(brand)s Android", { brand })}</div>
-                        </div>
-                        <p>{_t("or another cross-signing capable Matrix client")}</p>
-                    </div>
 
                     <div className="mx_CompleteSecurity_actionRow">
+                        {verifyButton}
                         {useRecoveryKeyButton}
                         <AccessibleButton kind="danger" onClick={this.onSkipClick}>
                             {_t("Skip")}
@@ -195,8 +204,8 @@ export default class SetupEncryptionBody extends React.Component {
             return (
                 <div>
                     <p>{_t(
-                        "Without completing security on this session, it won’t have " +
-                        "access to encrypted messages.",
+                        "Without verifying, you won’t have access to all your messages " +
+                        "and may appear as untrusted to others.",
                     )}</p>
                     <div className="mx_CompleteSecurity_actionRow">
                         <AccessibleButton
@@ -215,7 +224,7 @@ export default class SetupEncryptionBody extends React.Component {
                     </div>
                 </div>
             );
-        } else if (phase === PHASE_BUSY) {
+        } else if (phase === PHASE_BUSY || phase === PHASE_LOADING) {
             const Spinner = sdk.getComponent('views.elements.Spinner');
             return <Spinner />;
         } else {

src/components/structures/auth/SoftLogout.tsx

@@ -1,5 +1,5 @@
 /*
-Copyright 2019 The Matrix.org Foundation C.I.C.
+Copyright 2019-2021 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.
@@ -15,17 +15,17 @@ limitations under the License.
 */
 
 import React from 'react';
-import PropTypes from 'prop-types';
 import {_t} from '../../../languageHandler';
 import * as sdk from '../../../index';
 import dis from '../../../dispatcher/dispatcher';
 import * as Lifecycle from '../../../Lifecycle';
 import Modal from '../../../Modal';
 import {MatrixClientPeg} from "../../../MatrixClientPeg";
-import {sendLoginRequest} from "../../../Login";
+import {ISSOFlow, LoginFlow, sendLoginRequest} from "../../../Login";
 import AuthPage from "../../views/auth/AuthPage";
 import {SSO_HOMESERVER_URL_KEY, SSO_ID_SERVER_URL_KEY} from "../../../BasePlatform";
 import SSOButtons from "../../views/elements/SSOButtons";
+import {replaceableComponent} from "../../../utils/replaceableComponent";
 
 const LOGIN_VIEW = {
     LOADING: 1,
@@ -41,25 +41,38 @@ const FLOWS_TO_VIEWS = {
     "m.login.sso": LOGIN_VIEW.SSO,
 };
 
-export default class SoftLogout extends React.Component {
-    static propTypes = {
-        // Query parameters from MatrixChat
-        realQueryParams: PropTypes.object, // {loginToken}
-
-        // Called when the SSO login completes
-        onTokenLoginCompleted: PropTypes.func,
+interface IProps {
+    // Query parameters from MatrixChat
+    realQueryParams: {
+        loginToken?: string;
     };
+    fragmentAfterLogin?: string;
 
-    constructor() {
-        super();
+    // Called when the SSO login completes
+    onTokenLoginCompleted: () => void,
+}
+
+interface IState {
+    loginView: number;
+    keyBackupNeeded: boolean;
+    busy: boolean;
+    password: string;
+    errorText: string;
+    flows: LoginFlow[];
+}
+
+@replaceableComponent("structures.auth.SoftLogout")
+export default class SoftLogout extends React.Component<IProps, IState> {
+    constructor(props) {
+        super(props);
 
         this.state = {
             loginView: LOGIN_VIEW.LOADING,
             keyBackupNeeded: true, // assume we do while we figure it out (see componentDidMount)
-
             busy: false,
             password: "",
             errorText: "",
+            flows: [],
         };
     }
 
@@ -70,7 +83,7 @@ export default class SoftLogout extends React.Component {
             return;
         }
 
-        this._initLogin();
+        this.initLogin();
 
         const cli = MatrixClientPeg.get();
         if (cli.isCryptoEnabled()) {
@@ -92,7 +105,7 @@ export default class SoftLogout extends React.Component {
         });
     };
 
-    async _initLogin() {
+    private async initLogin() {
         const queryParams = this.props.realQueryParams;
         const hasAllParams = queryParams && queryParams['loginToken'];
         if (hasAllParams) {
@@ -187,7 +200,7 @@ export default class SoftLogout extends React.Component {
         });
     }
 
-    _renderSignInSection() {
+    private renderSignInSection() {
         if (this.state.loginView === LOGIN_VIEW.LOADING) {
             const Spinner = sdk.getComponent("elements.Spinner");
             return <Spinner />;
@@ -245,7 +258,7 @@ export default class SoftLogout extends React.Component {
             } // else we already have a message and should use it (key backup warning)
 
             const loginType = this.state.loginView === LOGIN_VIEW.CAS ? "cas" : "sso";
-            const flow = this.state.flows.find(flow => flow.type === "m.login." + loginType);
+            const flow = this.state.flows.find(flow => flow.type === "m.login." + loginType) as ISSOFlow;
 
             return (
                 <div>
@@ -287,7 +300,7 @@ export default class SoftLogout extends React.Component {
 
                     <h3>{_t("Sign in")}</h3>
                     <div>
-                        {this._renderSignInSection()}
+                        {this.renderSignInSection()}
                     </div>
 
                     <h3>{_t("Clear personal data")}</h3>