public function saveOptionsForm(Request $request)
 {
     $this->config->save('editor.concrete.enable_filemanager', $request->request->get('enable_filemanager'));
     $this->config->save('editor.concrete.enable_sitemap', $request->request->get('enable_sitemap'));
     $plugins = array();
     $post = $request->request->get('plugin');
     $selected_hidden = $this->config->get('editor.ckeditor4.plugins.selected_hidden');
     $post = array_merge($selected_hidden, $post);
     if (is_array($post)) {
         foreach ($post as $plugin) {
             if ($this->pluginManager->isAvailable($plugin)) {
                 $plugins[] = $plugin;
             }
         }
     }
     $this->config->save('editor.ckeditor4.plugins.selected', $plugins);
 }