stop listening timeline collection changes when app is not resumed (#7734)

changelog.d/7643.bugfix

@@ -0,0 +1 @@
+[Notifications] Fixed a bug when push notification was automatically dismissed while app is on background

vector/src/main/java/im/vector/app/features/home/room/detail/TimelineFragment.kt

@@ -975,6 +975,7 @@ class TimelineFragment :
         notificationDrawerManager.setCurrentThread(timelineArgs.threadTimelineArgs?.rootThreadEventId)
         roomDetailPendingActionStore.data?.let { handlePendingAction(it) }
         roomDetailPendingActionStore.data = null
+        views.timelineRecyclerView.adapter = timelineEventController.adapter
     }
 
     private fun handlePendingAction(roomDetailPendingAction: RoomDetailPendingAction) {
@@ -993,6 +994,7 @@ class TimelineFragment :
         super.onPause()
         notificationDrawerManager.setCurrentRoom(null)
         notificationDrawerManager.setCurrentThread(null)
+        views.timelineRecyclerView.adapter = null
     }
 
     private val emojiActivityResultLauncher = registerStartForActivityResult { activityResult ->
@@ -1058,7 +1060,6 @@ class TimelineFragment :
             it.dispatchTo(scrollOnHighlightedEventCallback)
         }
         timelineEventController.addModelBuildListener(modelBuildListener)
-        views.timelineRecyclerView.adapter = timelineEventController.adapter
 
         if (vectorPreferences.swipeToReplyIsEnabled()) {
             val quickReplyHandler = object : RoomMessageTouchHelperCallback.QuickReplayHandler {