  
              from_box.setAttribute('name', from_box.getAttribute('name') + '_old');
  
              // Set up the JavaScript event handlers for the select box filter interface
              var move_selection = function(elem, move_func, from, to) {
                  if (elem.className.indexOf('active') !== -1) {
                      move_func(from, to);
                      SelectFilter.refresh_icons(field_id);
                  }
              };
 
</s> remove             addEvent(choose_all, 'click', function(e) { move_selection(this, SelectBox.move_all, field_id + '_from', field_id + '_to'); });
            addEvent(add_link, 'click', function(e) { move_selection(this, SelectBox.move, field_id + '_from', field_id + '_to'); });
            addEvent(remove_link, 'click', function(e) { move_selection(this, SelectBox.move, field_id + '_to', field_id + '_from'); });
            addEvent(clear_all, 'click', function(e) { move_selection(this, SelectBox.move_all, field_id + '_to', field_id + '_from'); });
 </s> add             addEvent(choose_all, 'click', function(e) { move_selection(e, this, SelectBox.move_all, field_id + '_from', field_id + '_to'); });
            addEvent(add_link, 'click', function(e) { move_selection(e, this, SelectBox.move, field_id + '_from', field_id + '_to'); });
            addEvent(remove_link, 'click', function(e) { move_selection(e, this, SelectBox.move, field_id + '_to', field_id + '_from'); });
            addEvent(clear_all, 'click', function(e) { move_selection(e, this, SelectBox.move_all, field_id + '_to', field_id + '_from'); });
            var move_selection = function(e, elem, move_func, from, to) {
  
              from_box.setAttribute('name', from_box.getAttribute('name') + '_old');
  
              // Set up the JavaScript event handlers for the select box filter interface
            var move_selection = function(e, elem, move_func, from, to) {
                  if (elem.className.indexOf('active') !== -1) {
                      move_func(from, to);
                      SelectFilter.refresh_icons(field_id);
                  }
              };
keep keep keep keep replace keep keep keep keep keep
 Fixed #26612 -- Fixed SelectFilter2 buttons changing URL. 
django/contrib/admin/static/admin/js/SelectFilter2.js