message: Don't double-add events to threads in tests
diff: @@ -137,7 +137,6 @@ export const mkThread = ({
  const thread = room.createThread(rootEvent.getId(), rootEvent, events, true);
  // So that we do not have to mock the thread loading
  thread.initialEventsFetched = true;
  - thread.addEvents(events, false);
  return { thread, rootEvent, events };
  };
  