Merge branch 'develop' of github.com:matrix-org/matrix-react-sdk into t3chguy/fix/17686

 Conflicts:

	src/SlashCommands.tsx

	src/components/views/settings/tabs/room/SecurityRoomSettingsTab.tsx

	src/createRoom.ts

res/css/_components.scss

@@ -202,6 +202,7 @@
 @import "./views/rooms/_GroupLayout.scss";
 @import "./views/rooms/_IRCLayout.scss";
 @import "./views/rooms/_JumpToBottomButton.scss";
+@import "./views/rooms/_LinkPreviewGroup.scss";
 @import "./views/rooms/_LinkPreviewWidget.scss";
 @import "./views/rooms/_MemberInfo.scss";
 @import "./views/rooms/_MemberList.scss";

res/css/views/rooms/_EventTile.scss

@@ -477,8 +477,7 @@ $hover-select-border: 4px;
 
     pre, code {
         font-family: $monospace-font-family !important;
-        // deliberate constants as we're behind an invert filter
-        color: #333;
+        background-color: $header-panel-bg-color;
     }
 
     pre {
@@ -488,11 +487,6 @@ $hover-select-border: 4px;
         overflow-x: overlay;
         overflow-y: visible;
     }
-
-    code {
-        // deliberate constants as we're behind an invert filter
-        background-color: #f8f8f8;
-    }
 }
 
 .mx_EventTile_lineNumbers {

res/css/views/rooms/_LinkPreviewGroup.scss

@@ -0,0 +1,38 @@
+/*
+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.
+*/
+
+.mx_LinkPreviewGroup {
+    .mx_LinkPreviewGroup_hide {
+        cursor: pointer;
+        width: 18px;
+        height: 18px;
+
+        img {
+            flex: 0 0 40px;
+            visibility: hidden;
+        }
+    }
+
+    &:hover .mx_LinkPreviewGroup_hide img,
+    .mx_LinkPreviewGroup_hide.focus-visible:focus img {
+        visibility: visible;
+    }
+
+    > .mx_AccessibleButton {
+        color: $accent-color;
+        text-align: center;
+    }
+}

res/css/views/rooms/_LinkPreviewWidget.scss

@@ -33,12 +33,16 @@ limitations under the License.
 .mx_LinkPreviewWidget_caption {
     margin-left: 15px;
     flex: 1 1 auto;
+    overflow-x: hidden; // cause it to wrap rather than clip
 }
 
 .mx_LinkPreviewWidget_title {
-    display: inline;
     font-weight: bold;
     white-space: normal;
+    display: -webkit-box;
+    -webkit-line-clamp: 2;
+    -webkit-box-orient: vertical;
+    overflow: hidden;
 }
 
 .mx_LinkPreviewWidget_siteName {
@@ -49,22 +53,9 @@ limitations under the License.
     margin-top: 8px;
     white-space: normal;
     word-wrap: break-word;
-}
-
-.mx_LinkPreviewWidget_cancel {
-    cursor: pointer;
-    width: 18px;
-    height: 18px;
-
-    img {
-        flex: 0 0 40px;
-        visibility: hidden;
-    }
-}
-
-.mx_LinkPreviewWidget:hover .mx_LinkPreviewWidget_cancel img,
-.mx_LinkPreviewWidget_cancel.focus-visible:focus img {
-    visibility: visible;
+    display: -webkit-box;
+    -webkit-line-clamp: 3;
+    -webkit-box-orient: vertical;
 }
 
 .mx_MatrixChat_useCompactLayout {