Sortable: Placeholder not displayed when sorting table rows
When applying sortable() to a table ($('tbody').sortable()) and trying to sort rows in Google Chrome or Safari (based on the same rendering engine) - the placeholder is not shown, so the affect of row replacing doesn't occure. This happens because the empry <tr/>'s are not displayed. As i think table rows sorting is a frequent task so it would ge good to fix it. I just canged the code in _createPlaceholder() so that if sorting item is tr - it appends an empty <td/> to it and set's the size (width and height, most often it is only height) of this <td/> instead of <tr/>. This method works in Chrome, Safari, Firefox and Opera. IE wasn't tested.