 if (this.selectedItem === null) return;
      const selectedItem = this.selectedItem;
      const menuItemsArray = this.$.dropdown.items || [];
      for (let i = 0; i < menuItemsArray.length; i++) {
        if (menuItemsArray[i].item === selectedItem) {
          this.$.dropdown.selected = i;
          return;
        }
      }
    })();
    this.muffleSelection = false;
  },

  locusClassIfLocus(locusItem, anItem) {
    return locusItem === anItem ? 'locus' : '';
  },

  onDropdownMouseDown(event) {
    