code: function _handleListRendered(event, $dropdown) {
          var activeFilterIndex = PreferencesManager.getViewState("activeFileFilter"),
              checkedItemIndex = (activeFilterIndex > -1) ? (activeFilterIndex + FIRST_FILTER_INDEX) : -1;
          _picker.setChecked(checkedItemIndex, true);
  
          $dropdown.find(".filter-trash-icon")
              .on("click", _handleDeleteFilter);
  
          $dropdown.find(".filter-edit-icon")
              .on("click", _handleEditFilter);
      }
docs: Set up mouse click event listeners for 'Delete' and 'Edit' buttons
  when the dropdown is open. Also set check mark on the active filter.
  @param {!Event>} event listRendered event triggered when the dropdown is open
  @param {!jQueryObject} $dropdown the jQuery DOM node of the dropdown list