/**
  * Returns the allowed Entity Embed Display plugins given an embed button and
  * an entity.
  *
  * @param \Drupal\embed\EmbedButtonInterface $embed_button
  *   The embed button.
  * @param \Drupal\Core\Entity\EntityInterface $entity
  *   The entity.
  *
  * @return array
  *   List of allowed Entity Embed Display plugins.
  */
 public function getDisplayPluginOptions(EmbedButtonInterface $embed_button, EntityInterface $entity)
 {
     $plugins = $this->displayPluginManager->getDefinitionOptionsForEntity($entity);
     if ($allowed_plugins = $embed_button->getTypeSetting('display_plugins')) {
         $plugins = array_intersect_key($plugins, array_flip($allowed_plugins));
     }
     natsort($plugins);
     return $plugins;
 }