If a droppable is enlarged while dragging, can't drop in new 'space'

Note: This bug was observed in a version of jquery.ui trunk checked out March 25.

If a droppable is enlarged when dragging over it (e.g. by an activeClass that sets a new size, or by any other means) the draggable cannot be dropped into the area of the droppable that was not there originally.

How to repeat:

• add "height: 400px;" to the .silver class in the demo file (ui.droppable.html) to increase it's height:

.silver {
	background-color: #fafafa;
	border-color: silver;
	height: 400px;
}

Drag the draggable over the bottom half of the enlarged droppable and let go. It will not drop. It still works if you drop it onto the top half of the droppable (i.e. the original area).