Problems with IE8 and ui.sortable

Problems with IE8 and ui.sortable


Hi List,
I'm experiencing problems with IE8 and ui.sortable. The sorting stops
even though the mouse-button is still pressed. I've looked through the
code and think this is caused in the _mouseMove function of ui.mouse.
// IE mouseup check - mouseup happened when mouse was out of window
if ($.browser.msie && !event.button) {
    return this._mouseUp(event);
}
In this part, the button property of the mousemove-event in IE8 is 0,
even though the mouse-button is still pressed, and the _mouseUp
function is triggered.
I would consider this as a bug in IE8, but what can you do?
Has anybody an idea for a workaround?
Tobias