_onFilterUnmatch(option, curValue, prevValue) {
    this._unhighlightMatchedOption(option);

    // Alternatively, an extension can add an animation here
    option.style.display = 'none';
  }
@overridable
@param {LionOption & {__originalInnerHTML?:string}} option
@param {string} [curValue]
@param {string} [prevValue]
@protected