Disable notification triggers on group messages.

src/org/thoughtcrime/securesms/jobs/PushDecryptJob.java

@@ -988,7 +988,8 @@ public class PushDecryptJob extends BaseJob implements InjectableType {
         // Loki - Map message id to server id
         updatePublicChatMessageWithServerID(messageServerIDOrNull, insertResult);
 
-        if (threadId != null) {
+        boolean isGroupMessage = message.getGroupInfo().isPresent();
+        if (threadId != null && !isGroupMessage) {
           MessageNotifier.updateNotification(context, threadId);
         }
       }

src/org/thoughtcrime/securesms/notifications/MessageNotifier.java

@@ -388,6 +388,11 @@ public class MessageNotifier {
   }
 
   private static void sendInThreadNotification(Context context, Recipient recipient) {
+    // Keep group messages muted!
+    if (recipient.isGroupRecipient()) {
+      return;
+    }
+
     if (!TextSecurePreferences.isInThreadNotifications(context) ||
         ServiceUtil.getAudioManager(context).getRingerMode() != AudioManager.RINGER_MODE_NORMAL)
     {