Results

    case 'theme':
      system_rebuild_theme_data();
      drupal_theme_rebuild();
      break;
  }
}

/**
 * Preprocesses variables for theme_admin_menu_icon().

  \Drupal::moduleHandler()->invoke('menu', 'rebuild');
  \Drupal::cache('menu')->deleteAll();
  drupal_theme_rebuild();
}

/**
 * Implements hook_menu().
 */
function beautytips_ui_menu() {

// if (theme_get_setting('solid_rebuild_registry')) {
//   system_rebuild_theme_data();
//   drupal_theme_rebuild();
// }

/**
 * Implements HOOK_theme().
 */
function solid_theme() {

    // If the template is changed, do a theme registry rebuild.
    if (isset($bfd['template']) && $template != $bfd['template']) {
      drupal_theme_rebuild();
    }

    // Setting variables.
    $config = $this->config('better_field_descriptions.settings')->set('better_field_descriptions', $form_state->getValue('bundles'));
    $config->save();
    parent::submitForm($form, $form_state);

    if ($this->config->get('rebuild_theme')) {
      // Update the theme registry.
      drupal_theme_rebuild();
      // Refresh theme data.
      $this->themeHandler->refreshInfo();
      // Resets the internal state of the theme handler and clear the 'system
      // list' cache; this allow to properly register, if needed, PSR-4
      // namespaces for theme extensions after refreshing the info data.
      $this->themeHandler->reset();