reverted:
--- b/core/modules/contextual/src/Plugin/views/field/ContextualLinks.php
+++ a/core/modules/contextual/src/Plugin/views/field/ContextualLinks.php
@@ -87,7 +87,15 @@
   }
 
   /**
+   * Overrides \Drupal\views\Plugin\views\field\FieldPluginBase::render().
+   *
+   * Renders the contextual fields.
+   *
+   * @param \Drupal\views\ResultRow $values
+   *   The values retrieved from a single row of a view's query result.
+   *
+   * @see contextual_preprocess()
+   * @see contextual_contextual_links_view_alter()
-   * {@inheritdoc}
    */
   public function render(ResultRow $values) {
     $links = array();