Drupal → Запретить установку ajax-кнопке атрибута disabled при клике

(function ($) {
  var ajaxBeforeSend = Drupal.ajax.prototype.beforeSend;
 
  Drupal.ajax.prototype.beforeSend = function(xmlhttprequest, options) {
    var elementFocused = $(this.element).is(':focus');
 
    ajaxBeforeSend.apply(this, arguments);
 
    if ('disabled' in this && !this.disabled) {
      this.ajaxing = false;
      $(this.element).removeClass('progress-disabled').attr('disabled', false);
      if (elementFocused) {
        $(this.element).focus();
      }
    }
  }
})(jQuery);

$form['submit'] = array(
  ...
  '#type' => 'submit',
  '#ajax' => array(
    ...
    'disabled' => FALSE,
  ),
);

$form['textfield'] = array(
  ...
  '#type' => 'textfield',
  '#ajax' => array(
    ...
    'event' => 'keyup',
    'disabled' => FALSE,
  ),
);