Adding a new row via field in frozen columns section of example-frozen-columns leads to mismatching left/right

[whelaro]

Steps:

go to http://jlynch7.github.io/SlickGrid/examples/example-frozen-columns.html

scroll to bottom, enter editor mode of Title, and enter test data. press enter.

fix, just one line (bottom one. In fact, don't reproduce my entire bit as I've extended it to use textbox data for Title1-Title4):

  grid.onAddNewRow.subscribe(function (e, args) {
    var item = {
        "num": data.length + 1, "id": data.length, "title": "New task", "duration": "1 day", "percentComplete": 0, "start": "01/01/2009", "finish": "01/01/2009", "effortDriven": false,
                "title1": $('#item1').val(), "title2": $('#item2').val(), "title3": $('#item3').val(), "title4": $('#item4').val()};
    $.extend(item, args.item);
    dataView.addItem(item);
    grid.invalidate();
    grid.scrollRowIntoView(grid.getDataLength(),true);
});