Merge pull request #4863 from matrix-org/joriks/room-list-autohide-scrollbar

Hide scrollbar without pixel jumping

src/components/structures/LeftPanel2.tsx

@@ -205,6 +205,11 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
             "mx_LeftPanel2_minimized": this.props.isMinimized,
         });
 
+        const roomListClasses = classNames(
+            "mx_LeftPanel2_actualRoomListContainer",
+            "mx_AutoHideScrollbar",
+        );
+
         return (
             <div className={containerClasses}>
                 {tagPanel}
@@ -212,7 +217,7 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
                     {this.renderHeader()}
                     {this.renderSearchExplore()}
                     <div
-                        className="mx_LeftPanel2_actualRoomListContainer"
+                        className={roomListClasses}
                         onScroll={this.onScroll}
                         ref={this.listContainerRef}
                     >{roomList}</div>