message: Fix notif panel exception around accessing roomId of undefined
diff: @@ -798,7 +798,7 @@ class TimelinePanel extends React.Component<IProps, IState> {
  if (this.unmounted) return;
  // ignore events for other rooms
  - if (replacedEvent.getRoomId() !== this.props.timelineSet.room.roomId) return;
  + if (replacedEvent.getRoomId() !== this.props.timelineSet.room?.roomId) return;
  // we could skip an update if the event isn't in our timeline,
  // but that's probably an early optimisation.
  