[haiku-appserver] BWindowScreen / pageflipper once more

Hi,

About the ball's color (should be blue, sometimes I see black), lines 
(should be white, but have rainbow colors and seem to small) and mess 
onscreen (should be gone, but sometimes there):
After running this app multiple times in a row, it seems it behaves 
different every time. It's not reproducable very well. Needs more 
investigation I think. If one of you wants to see what I'm talking 
about, just grab a R5 compiled page_flipper and todays build of Haiku. 
Should be fun to nail down ;-)

Bye!

Rudolf.

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