_setSelectedIndexWithFocus(value) {
    if (value === -1) {
      return;
    }
    const stale = this.__selectedIndex;
    this.__selectedIndex = value;
    this.__updateSelected(true);
    this.dispatchEvent(new Event('selected-changed'));
    this.requestUpdate('selectedIndex', stale);
  }
@param {number} value The new index for focus
@protected