function createHighlight() {
  var s = new _src.Selection({
    className: 'fill',
    border: {
      width: 1,
      color: '#ff0000'
    }
  });
  return s;
}
Creates the new instance of Selection, responsible for highlighting cells which are covered by fill handle
functionality. This type of selection can present on the table only one at the time.

@return {Selection}