docs: function () {
              var indexes = this.getHighlight();
              var rightMostIndex = indexes[indexes.length - 1];
              var limit = this.insertedOptionsCount();
  
              var index = rightMostIndex + 1;
  
              if (index <= limit) {
                  this.highlightOption(index);
              } else {
                  this.removeHighlight();
                  this._enterInputField();
              }
          }