[haiku-appserver] update code.

Hi guys,

        I tweaked, or at least I think I did, the app_server's update code to 
update only what's needed, so correct results should appear on-screen.
        Now, this appears to function well, but I need something from 
DisplayDriver to work perfectly.
        I need DisplayDriver subclasses to implement ConstainClippingRegion() 
and _completely_ ignore LayerData::clipReg.
        ConstainClippingRegion() should function like BView's version, with a 
minor difference - passing an empty region should be handled exactly 
like when passing NULL.


        Now, about CopyRegionList() I will explain this tomorrow as I'm pretty 
tired. I can give you a hint, it's _really_useful when resizing a window 
with lots of views(aligned to center or right) inside it. BTW, this is 
one area where our app_server does better that R5's one, as that 
completely redraws center or right aligned views (tested that). It can 
do better if that method would be optimized, as there is _plenty_ of 
room to do that. :-)


b-bye for now,
Adi.

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