* @return $this
*
* @deprecated in Drupal 8.2.x-dev and will be removed before Drupal 9.0.0.
- * Use \Drupal::config('system.theme')->set('default', $theme)->save().
+ * Use
+ * @code
+ * \Drupal::configFactory()
+ * ->getEditable('system.theme')
+ * ->set('default', $theme)
+ * ->save();
+ * @endcode
*/
public function setDefault($theme);