BUGFIX: not updating tracking state after entering a topic

Occurs in 2 cases:

1. Change "Regular" to "Tracking" other browsers do not update
2. If you are set to track all new topics on enter.

app/models/topic_user.rb

@@ -112,6 +112,13 @@ class TopicUser < ActiveRecord::Base
           observe_after_save_callbacks_for topic_id, user_id
         end
       end
+
+      if attrs[:notification_level]
+        MessageBus.publish("/topic/#{topic_id}",
+                         {notification_level_change: attrs[:notification_level]}, user_ids: [user_id])
+      end
+
+
     rescue ActiveRecord::RecordNotUnique
       # In case of a race condition to insert, do nothing
     end
@@ -210,6 +217,8 @@ class TopicUser < ActiveRecord::Base
                                    FROM topic_users AS ftu
                                    WHERE ftu.user_id = :user_id and ftu.topic_id = :topic_id)",
                   args)
+
+        MessageBus.publish("/topic/#{topic_id}", {notification_level_change: args[:new_status]}, user_ids: [user.id])
       end
     end