docs: function manageIfFewItems() {
      const itemsCount = getLength.call( this, this.items );
      if ( itemsCount < 2 ) return true;
      if ( itemsCount === 2 ) {
          this.index = 1 - this.index;
          this.expanded = false;
          return true;
      }
      // More than 2 items to manage.
      return false;
  }