https://superforma.fr/sites/all/modules/tag1d7es_jquery_update/js/jquery_position.js?v=0.0.1

1/**
2 * Workaround for .position() behaviour which was changed in jQuery 3.3
3 * @see https://github.com/jquery/api.jquery.com/issues/1081
4 */
5var Drupal = Drupal || {};
6
7(function ($, Drupal) {
8  // Overload Drupal.jsAC.prototype.populatePopup
9  if (Drupal.jsAC !== undefined && Drupal.jsAC.prototype.populatePopup !== undefined) {
10    Drupal.jsAC.prototype.populatePopup = function () {
11      var $input = $(this.input);
12      var offset = $input.offset();
13      var offsetParent = $input.offsetParent().offset();
14      // Show popup.
15      if (this.popup) {
16        $(this.popup).remove();
17      }
18      this.selected = false;
19      this.popup = $('<div id="autocomplete"></div>')[0];
20      this.popup.owner = this;
21      $(this.popup).css({
22        top: parseInt(offset.top - offsetParent.top + this.input.offsetHeight, 10) + 'px',
23        left: parseInt(offset.left - offsetParent.left, 10) + 'px',
24        width: $input.innerWidth() + 'px',
25        display: 'none'
26      });
27      $input.before(this.popup);
28
29      // Do search.
30      this.db.owner = this;
31      this.db.search(this.input.value);
32    };
33  }
34})(jQuery, Drupal);