Issue #2102451 by vijaycs85, sidharthap: Remove drupal_set_title() in filter module controllers.

core/modules/filter/filter.routing.yml

@@ -25,6 +25,7 @@ filter.format_add:
   path: '/admin/config/content/formats/add'
   defaults:
     _entity_form: filter_format.add
+    _title: 'Add text format'
   requirements:
     _permission: 'administer filters'
 

core/modules/filter/lib/Drupal/filter/FilterFormatAddFormController.php

@@ -16,7 +16,6 @@ class FilterFormatAddFormController extends FilterFormatFormControllerBase {
    * {@inheritdoc}
    */
   public function form(array $form, array &$form_state) {
-    drupal_set_title('Add text format');
     return parent::form($form, $form_state);
   }
 

core/modules/filter/lib/Drupal/filter/FilterFormatEditFormController.php

@@ -22,7 +22,7 @@ public function form(array $form, array &$form_state) {
       throw new NotFoundHttpException();
     }
 
-    drupal_set_title($this->entity->label());
+    $form['#title'] = $this->entity->label();
     $form = parent::form($form, $form_state);
     $form['roles']['#default_value'] = array_keys(filter_get_roles_by_format($this->entity));
     return $form;