X11 display problems

Hi Ian, folks,

we just got another report of the two display problems in X11:

        http://tracker.squeakland.org/browse/SQ-1126

One issue is the window shrinking to a vertical line, the other not updating the whole window after maximizing.

Apparently removing -xshm helps for the shrinking problem. If anyone has any insight on these that would be great!

- Bert -