Resizable stack with a custom shape (was: Re: Transparent stacks...)

[Chipp Walters]

Another way to consider doing this is to turn OFF the windowShape property
while resizing, then after resizing is finished, calculate a new windowshape
and apply it at that time. A lot of pain to go through. Or perhaps tunring
OFF liveResizing and then 'snapping to' a size to a predetermined window
size with a windowshape bitmap already available.

Currently, RR doesn't have an elegant way to do this. Scott's idea may be
the best.