FIX: Inviting a group that I am part of creates a notification.

https://meta.discourse.org/t/inviting-a-group-to-a-message-does-not-trigger-a-notification-mail/50509/10?u=tgxworld

app/models/topic.rb

@@ -765,7 +765,8 @@ SQL
       group_id = group.id
 
       group.users.where(
-        "group_users.notification_level > ?", NotificationLevels.all[:muted]
+        "group_users.notification_level > ? AND user_id != ?",
+        NotificationLevels.all[:muted], user.id
       ).find_each do |u|
 
         u.notifications.create!(

spec/models/topic_spec.rb

@@ -675,6 +675,7 @@ describe Topic do
 
             group.add(user)
             group.add(user_2)
+            group.add(topic.user)
 
             group.group_users.find_by(user: user_2).update!(
               notification_level: NotificationLevels.all[:muted]