Merge pull request #1849 from Infomaniak/fix-empty-group-notifications

Fix condition to know if the group notification for a specific mailbox is empty

app/src/main/java/com/infomaniak/mail/utils/FetchMessagesManager.kt

@@ -139,10 +139,17 @@ class FetchMessagesManager @Inject constructor(
             }
         }
 
-        // We don't need to display a group notification saying "0 new messages" so
-        // if we don't have any active notifications, we dismiss the group notification.
-        if (notificationManagerCompat.activeNotifications.isEmpty()) {
-            notificationManagerCompat.cancel(mailbox.notificationGroupId)
+        /**
+         * We don't want to display an empty group notification saying "0 new messages".
+         *
+         * If we only have 1 active notification for a specific Mailbox, it means that there is either :
+         * - 1 normal notification,
+         * - or 1 empty group notification.
+         * In case of the later, we need to cancel it.
+         */
+        with(notificationManagerCompat) {
+            val mailboxGroupNotifications = activeNotifications.filter { it.notification.group == mailbox.notificationGroupKey }
+            if (mailboxGroupNotifications.size == 1) cancel(mailbox.notificationGroupId)
         }
 
         if (threadsWithNewMessages.isEmpty()) {