Add dialog to navigate long room topics (#8517)

src/components/structures/SpaceRoomView.tsx

@@ -267,13 +267,7 @@ const SpaceLanding = ({ space }: { space: Room }) => {
                 { settingsButton }
             </div>
         </div>
-        <RoomTopic room={space}>
-            { (topic, ref) => (
-                <div className="mx_SpaceRoomView_landing_topic" ref={ref}>
-                    { topic }
-                </div>
-            ) }
-        </RoomTopic>
+        <RoomTopic room={space} className="mx_SpaceRoomView_landing_topic" />
 
         <SpaceHierarchy space={space} showRoom={showRoom} additionalButtons={addRoomButton} />
     </div>;