Video corruption in Mahjongg

[Steve Magoun]

On Menlow-based hardware, tiles are drawn incorrectly in the Mahjongg game at large window sizes, making the game unplayable.

To reproduce:
1) If necessary, install the gnome-games package
2) Make sure screen resolution is at least 1024x768
3) Run Mahjongg (/usr/games/mahjongg)
4) Maximize the mahjongg window

This only happens on systems with a Poulsbo graphics chip + the xserver-xorg-video-psb driver; switching to the vesa gfx driver on the same system fixes the problem.

I suspect this comment from Mahjongg's drawing.c is relevant:

/* We store two large pixmaps in the X server. One has a copy of all the
 * tile foregrounds composited against the normal background. The other
 * is composited against the "selected tile" background. Any drawing is
 * then done from these onto a buffer pixmap and finally onto the
 * actual window. */

[Loïc Minier (lool)]

Patch from Intel pushed to ubuntu-mobile hardy ppa.