Display a single notification for all the fallback notifications.

When dismissed, dismiss all the fallback notifications in the model.

changelog.d/994.bugfix

@@ -0,0 +1 @@
+Group fallback notification to avoid having plenty of them displayed.

libraries/push/impl/src/main/kotlin/io/element/android/libraries/push/impl/notifications/NotificationEventQueue.kt

@@ -136,7 +136,13 @@ data class NotificationEventQueue constructor(
     }
 
     fun clearEvent(sessionId: SessionId, eventId: EventId) {
-        queue.removeAll { it.sessionId == sessionId && it.eventId == eventId }
+        val isFallback = queue.firstOrNull { it.sessionId == sessionId && it.eventId == eventId } is FallbackNotifiableEvent
+        if (isFallback) {
+            Timber.d("Removing all the fallbacks")
+            queue.removeAll { it.sessionId == sessionId && it is FallbackNotifiableEvent }
+        } else {
+            queue.removeAll { it.sessionId == sessionId && it.eventId == eventId }
+        }
     }
 
     fun clearMembershipNotificationForSession(sessionId: SessionId) {

libraries/push/impl/src/main/kotlin/io/element/android/libraries/push/impl/notifications/NotificationRenderer.kt

@@ -124,6 +124,7 @@ class NotificationRenderer @Inject constructor(
                 }
             }
 
+            /*
             fallbackNotifications.forEach { wrapper ->
                 when (wrapper) {
                     is OneShotNotification.Removed -> {
@@ -143,6 +144,23 @@ class NotificationRenderer @Inject constructor(
                     }
                 }
             }
+             */
+            val removedFallback = fallbackNotifications.filterIsInstance<OneShotNotification.Removed>()
+            val appendFallback = fallbackNotifications.filterIsInstance<OneShotNotification.Append>()
+            if (appendFallback.isEmpty() && removedFallback.isNotEmpty()) {
+                Timber.tag(loggerTag.value).d("Removing global fallback notification")
+                notificationDisplayer.cancelNotificationMessage(
+                    tag = "FALLBACK",
+                    id = notificationIdProvider.getFallbackNotificationId(currentUser.userId)
+                )
+            } else if (appendFallback.isNotEmpty()) {
+                Timber.tag(loggerTag.value).d("Showing fallback notification")
+                notificationDisplayer.showNotificationMessage(
+                    tag = "FALLBACK",
+                    id = notificationIdProvider.getFallbackNotificationId(currentUser.userId),
+                    notification = appendFallback.first().notification
+                )
+            }
 
             // Update summary last to avoid briefly displaying it before other notifications
             if (summaryNotification is SummaryNotification.Update) {