code: function cleanFilter() {
          sbSearch.reset();
          if (!templateOpts.sidebar.enabled || !$sidebarNodes) return;
  
          setFilterBtnStates();
  
          if ($txtSearch) $txtSearch.val('');
          $sidebarNodes.removeClass('hidden');
          if ($btnClean) $btnClean.hide();
          $('.toolbar-buttons > span').css('color', '#fff');
          // show back the chevrons within the sidebar symbols.
          $('.chevron').show();
          // reset outline back to initial value
          setTimeout(function () {
              setSidebarNodesOutline(templateOpts.sidebar.outline);
              if ($txtSearch) $txtSearch.focus();
          }, 100); // with a little delay
          isFilterActive = false;
      }
docs: Cleans the search filter.
  @private