Issue #3071689 by markcarver: Data attributes aren't applied to modals when loaded via ajax

      return;

    }

    var attributes = Attributes.create(element).remove('style').set('data-drupal-theme', this.themeHooks.modal);

    // Merge in trigger data attributes.

    if (options.$trigger && options.$trigger[0]) {

      var trigger = options.$trigger[0];

      var data = trigger.getAttributeNames().filter(function (name) {

        return name.startsWith('data-');

      }).reduce(function (data, name) {

        data[name] = trigger.getAttribute(name);

        return data;

      }, {});

      attributes.merge(data);

    }

    options = $.extend(true, {}, options, {

      attributes: Attributes.create(element).remove('style').set('data-drupal-theme', this.themeHooks.modal),

      attributes: attributes,

    });

    // Create a new modal.