fix for janky scrolling when tapping reply with SuperSliverView

I don't like this but it does work.

lib/widgets/room_chat/room_chat.dart

@@ -95,10 +95,11 @@ final class const RoomChat({
     Future<void> jumpToId(String eventId) async {
       highlightedEvent.value = eventId;
 
-      await scroll.jumpToId(eventId);
+      final jump = scroll.jumpToId(eventId);
       await Future.delayed(.new(seconds: 1), () {
         if (highlightedEvent.value == eventId) highlightedEvent.value = null;
       });
+      await jump;
     }
 
     IList<PopupMenuEntry> getEventOptions(Event event) =>