UserController: Add tab for the list action

refs #8826

application/controllers/UserController.php

@@ -11,6 +11,14 @@ use Icinga\Web\Widget;
 
 class UserController extends Controller
 {
+    /**
+     * Initialize this controller
+     */
+    public function init()
+    {
+        $this->createTabs();
+    }
+
     /**
      * Redirect to this controller's list action
      */
@@ -45,6 +53,7 @@ class UserController extends Controller
         $query->applyFilter($filterEditor->getFilter());
         $this->setupFilterControl($filterEditor);
 
+        $this->getTabs()->activate('user/list');
         $this->view->backend = $backend;
         $this->view->users = $query->paginate();
 
@@ -99,4 +108,21 @@ class UserController extends Controller
 
         return $backend;
     }
+
+    /**
+     * Create the tabs
+     */
+    protected function createTabs()
+    {
+        $tabs = $this->getTabs();
+        $tabs->add(
+            'user/list',
+            array(
+                'title'     => $this->translate('List users of authentication backends'),
+                'label'     => $this->translate('Users'),
+                'icon'      => 'users',
+                'url'       => 'user/list'
+            )
+        );
+    }
 }