Fix / Day separator flickering in timeline

Sending events were not filtered, so sending events like reactions would make the day separator appear

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/timeline/DefaultTimeline.kt

@@ -289,7 +289,9 @@ internal class DefaultTimeline(
     private fun buildSendingEvents(): List<TimelineEvent> {
         val sendingEvents = ArrayList<TimelineEvent>()
         if (hasReachedEnd(Timeline.Direction.FORWARDS)) {
-            roomEntity?.sendingTimelineEvents?.forEach {
+            roomEntity?.sendingTimelineEvents
+                    ?.filter { allowedTypes?.contains(it.type) ?: false }
+                    ?.forEach {
                         val timelineEvent = timelineEventFactory.create(it)
                         sendingEvents.add(timelineEvent)
                     }