don't add badge for messages with no mention

SignalUtilitiesKit/Messaging/OWSMessageUtils.m

@@ -73,7 +73,7 @@ NS_ASSUME_NONNULL_BEGIN
         YapDatabaseViewTransaction *unreadMessages = [transaction ext:TSUnreadDatabaseViewExtensionName];
         NSArray<NSString *> *allGroups = [unreadMessages allGroups];
         for (NSString *groupID in allGroups) {
-            TSThread *thread = [TSThread fetchObjectWithUniqueID:groupID transaction:transaction];
+            TSGroupThread *thread = [TSGroupThread fetchObjectWithUniqueID:groupID transaction:transaction];
             if (thread.isMuted) continue;
             [unreadMessages enumerateKeysAndObjectsInGroup:groupID
                                                 usingBlock:^(NSString *collection, NSString *key, id object, NSUInteger index, BOOL *stop) {
@@ -85,6 +85,10 @@ NS_ASSUME_NONNULL_BEGIN
                     NSLog(@"Found an already read message in the * unread * messages list.");
                     return;
                 }
+                TSIncomingMessage * incomingMessage = (TSIncomingMessage *)object;
+                if (incomingMessage != nil && thread.isOnlyNotifyingForMentions && !incomingMessage.isUserMentioned) {
+                    return;
+                }
                 count += 1;
             }];
         }