background pixmap as buffer

[Wouter van Kleunen <w a p vankleunen student utwente nl>]

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Ok. The following patch will make gtk use the background pixmap as a buffer. 
The result is pretty good. Try the patch, and then try shading/unshading one 
window over another. The update "appears" to be really fast (no update 
happens). 

I have placed the back buffer resize the event handling of gdkevents-x11. But 
it seems alot of resize pass gdk_event_translate, but not all result in a 
window redraw. Is there some place where a resize event does always result in 
a repaint ?

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