https://www.collanos.com/misc/textarea.js

1var _____WB$wombat$assign$function_____=function(name){return (self._wb_wombat && self._wb_wombat.local_init && self._wb_wombat.local_init(name))||self[name];};if(!self.__WB_pmw){self.__WB_pmw=function(obj){this.__WB_source=obj;return this;}}{
2let window = _____WB$wombat$assign$function_____("window");
3let self = _____WB$wombat$assign$function_____("self");
4let document = _____WB$wombat$assign$function_____("document");
5let location = _____WB$wombat$assign$function_____("location");
6let top = _____WB$wombat$assign$function_____("top");
7let parent = _____WB$wombat$assign$function_____("parent");
8let frames = _____WB$wombat$assign$function_____("frames");
9let opens = _____WB$wombat$assign$function_____("opens");
10// $Id: textarea.js,v 1.11 2006/09/07 08:05:31 dries Exp $
11
12Drupal.textareaAttach = function() {
13  $('textarea.resizable:not(.processed)').each(function() {
14    var textarea = $(this).addClass('processed'), staticOffset = null;
15
16    $(this).wrap('<div class="resizable-textarea"></div>')
17      .parent().append($('<div class="grippie"></div>').mousedown(startDrag));
18
19    var grippie = $('div.grippie', $(this).parent())[0];
20    grippie.style.marginRight = (grippie.offsetWidth - $(this)[0].offsetWidth) +'px';
21
22    function startDrag(e) {
23      staticOffset = textarea.height() - Drupal.mousePosition(e).y;
24      textarea.css('opacity', 0.25);
25      $(document).mousemove(performDrag).mouseup(endDrag);
26      return false;
27    }
28
29    function performDrag(e) {
30      textarea.height(Math.max(32, staticOffset + Drupal.mousePosition(e).y) + 'px');
31      return false;
32    }
33
34    function endDrag(e) {
35      $(document).unmousemove(performDrag).unmouseup(endDrag);
36      textarea.css('opacity', 1);
37    }
38  });
39}
40
41if (Drupal.jsEnabled) {
42  $(document).ready(Drupal.textareaAttach);
43}
44
45}