Fix notification panel not loading (#2283)

Author: Germain

src/client.ts

@@ -5434,10 +5434,10 @@ export class MatrixClient extends TypedEventEmitter<EmittedEvents, ClientEventHa
                     matrixEvents[i] = event;
                 }
 
+                // No need to partition events for threads here, everything lives
+                // in the notification timeline set
                 const timelineSet = eventTimeline.getTimelineSet();
-                const [timelineEvents, threadedEvents] = timelineSet.room.partitionThreadedEvents(matrixEvents);
-                timelineSet.addEventsToTimeline(timelineEvents, backwards, eventTimeline, token);
-                await this.processThreadEvents(timelineSet.room, threadedEvents, backwards);
+                timelineSet.addEventsToTimeline(matrixEvents, backwards, eventTimeline, token);
 
                 // if we've hit the end of the timeline, we need to stop trying to
                 // paginate. We need to keep the 'forwards' token though, to make sure