SlickGrid pull #746

HTML

<script src="http://mleibman.github.io/SlickGrid/lib/jquery.event.drag-2.2.js"></script>
<script src="https://rawgithub.com/icoxfog417/SlickGrid/issue739/slick.core.js"></script>
<script src="https://rawgithub.com/icoxfog417/SlickGrid/issue739/slick.grid.js"></script>
<link rel="stylesheet" href="https://rawgithub.com/icoxfog417/SlickGrid/issue739/slick.grid.css">
<script src="http://mleibman.github.io/SlickGrid/slick.dataview.js"></script>
<script src="http://mleibman.github.io/SlickGrid/controls/slick.pager.js"></script>
<div id="myGrid" style="width:400px; height: 500px;"></div>

JavaScript

(function ($) {
  // register namespace
  $.extend(true, window, {
    "Slick": {
      "RowSelectionModel": RowSelectionModel
    }
  });

  function RowSelectionModel(options) {
    var _grid;
    var _ranges = [];
    var _self = this;
    var _handler = new Slick.EventHandler();
    var _inHandler;
    var _options;
    var _defaults = {
      selectActiveRow: true
    };

    function init(grid) {
      _options = $.extend(true, {}, _defaults, options);
      _grid = grid;
      _handler.subscribe(_grid.onActiveCellChanged,
          wrapHandler(handleActiveCellChange));
      _handler.subscribe(_grid.onKeyDown,
          wrapHandler(handleKeyDown));
      _handler.subscribe(_grid.onClick,
          wrapHandler(handleClick));
    }

    function destroy() {
      _handler.unsubscribeAll();
    }

    function wrapHandler(handler) {
      return function () {
        if (!_inHandler) {
          _inHandler = true;
          handler.apply(this, arguments);
          _inHandler = false;
        }
      };
    }

    function rangesToRows(ranges) {
      var rows = [];
      for (var i = 0; i < ranges.length; i++) {
        for (var j = ranges[i].fromRow; j <= ranges[i].toRow; j++) {
          rows.push(j);
        }
      }
      return rows;
    }

    function rowsToRanges(rows) {
      var ranges = [];
      var lastCell = _grid.getColumns().length - 1;
      for (var i = 0; i < rows.length; i++) {
        ranges.push(new Slick.Range(rows[i], 0, rows[i], lastCell));
      }
      return ranges;
    }

    function getRowsRange(from, to) {
      var i, rows = [];
      for (i = from; i <= to; i++) {
        rows.push(i);
      }
      for (i = to; i < from; i++) {
        rows.push(i);
      }
      return rows;
    }

    function getSelectedRows() {
      return rangesToRows(_ranges);
    }

    function setSelectedRows(rows) {
      setSelectedRanges(rowsToRanges(rows));
    }

    function setSelectedRanges(ranges) {
      _ranges = ranges;
     ...