https://www.copernicus.eu/core/modules/ckeditor5/js/ckeditor5.dialog.fix.js?v=10.6.17

1/**
2 * @file
3 * This file overrides the way jQuery UI focus trap works.
4 *
5 * When a focus event is fired while a CKEditor 5 instance is focused, do not
6 * trap the focus and let CKEditor 5 manage that focus.
7 */
8
9(($) => {
10  $.widget('ui.dialog', $.ui.dialog, {
11    // Override core override of jQuery UI's `_allowInteraction()` so that
12    // CKEditor 5 in modals can work as expected.
13    // @see https://api.jqueryui.com/dialog/#method-_allowInteraction
14    _allowInteraction(event) {
15      // Fixes "Uncaught TypeError: event.target.classList is undefined"
16      // in Firefox (only).
17      // @see https://www.drupal.org/project/drupal/issues/3351600
18      if (event.target.classList === undefined) {
19        return this._super(event);
20      }
21      return event.target.classList.contains('ck') || this._super(event);
22    },
23  });
24})(jQuery);