Moved to own file for session taken over feature, because of non longer existing task bar widget.

app/assets/javascripts/app/controllers/widget/maintenance.js.coffee

@@ -31,4 +31,4 @@ class Message extends App.ControllerModal
       forceReload: message.reload
     )
 
-App.Config.set( 'maintenance', Widget, 'Widgets' )
+App.Config.set( 'maintenance', Widget, 'Widgets' )

app/assets/javascripts/app/controllers/widget/session_taken_over.js.coffee

@@ -0,0 +1,54 @@
+class Widget extends App.Controller
+
+  constructor: ->
+    super
+    @bind()
+
+  bind: ->
+
+    # only do take over check after spool messages are finised
+    App.Event.bind(
+      'spool:sent'
+      =>
+        @spoolSent = true
+
+        # broadcast to other browser instance
+        App.WebSocket.send(
+          action: 'broadcast'
+          event:  'session:takeover'
+          spool:  true
+          recipient:
+            user_id: [ App.Session.get( 'id' ) ]
+          data:
+            taskbar_id: App.TaskManager.TaskbarId()
+        )
+      'maintenance'
+    )
+
+    # session take over message
+    App.Event.bind(
+      'session:takeover'
+      (data) =>
+
+        # only if spool messages are already sent
+        return if !@spoolSent
+
+        # check if error message is already shown
+        if !@error
+
+          # only if new client id isnt own client id
+          if data.taskbar_id isnt App.TaskManager.TaskbarId()
+            @error = new App.SessionMessage(
+              title:       'Session'
+              message:     'Session taken over... please reload page or work with other browser window.'
+              keyboard:    false
+              backdrop:    true
+              close:       true
+              button:      'Reload application'
+              forceReload: true
+            )
+            @disconnectClient()
+      'maintenance'
+    )
+
+App.Config.set( 'session_taken_over', Widget, 'Widgets' )