Keep last level 2 selection (e. g. admin interface) for 10 minutes (maybe need to be changed later).

app/assets/javascripts/app/controllers/_application_controller_generic.coffee

@@ -419,8 +419,14 @@ class App.ControllerNavSidbar extends App.ControllerContent
 
       group.items = _.sortBy( itemsUnsorted, (item) -> return item.prio )
 
-    # set active item
+    # check last selected item
     selectedItem = undefined
+    selectedItemMeta = App.Config.get("Runtime::#{@configKey}")
+    keepLastMenuFor = 1000 * 60 * 10
+    if selectedItemMeta && selectedItemMeta.date && new Date < new Date( selectedItemMeta.date.getTime() + keepLastMenuFor )
+      selectedItem = selectedItemMeta.selectedItem
+
+    # set active item
     for group in @groupsSorted
       if group.items
         for item in group.items
@@ -441,15 +447,22 @@ class App.ControllerNavSidbar extends App.ControllerContent
         @render(selectedItem, true)
     )
 
-  render: (selectedItem, force) ->
-    if !$( '.' + @configKey )[0] || force
+  render: (selectedItem, force) =>
+
+    # remember latest selected item
+    selectedItemMeta =
+      selectedItem: selectedItem
+      date: new Date
+    App.Config.set("Runtime::#{@configKey}", selectedItemMeta)
+
+    if !$( ".#{@configKey}" )[0] || force
       @html App.view('generic/navbar_l2')(
         groups:     @groupsSorted
         className:  @configKey
       )
     if selectedItem
       @el.find('li').removeClass('active')
-      @el.find('a[href="' + selectedItem.target + '"]').parent().addClass('active')
+      @el.find("a[href=\"#{selectedItem.target}\"]").parent().addClass('active')
 
       new selectedItem.controller(
         el: @el.find('.main')