[haiku-appserver] invalidation again

Hi,

I was trying to make BView::Invalidate() work. I'm giving up, because I 
don't understand the code. I have an idea what the problem is, but I 
have no idea where to fix it. The triggering of update requests works 
for moving windows arround. So I thought it must be simple to make 
BView::Invalidate() work. However, there is no one central mechanism, 
while it should be the same thing. Instead, there is horrible 
commenting, bad naming of member variables and functions. A ton of 
similar functions that seem to be ment for the same thing. Refactoring 
is desperately needed. A little commenting about the *structure* of the 
code and the interacting parts would help too.

Adi, if you find some time, it would be really nice if you could make 
BView::Invalidate() work. I would do it, but I'm just clueless.

Since this is an open source project, we all benefit from people 
digging in and trying to help. So code should be written with that in 
mind.

Best regards,
-Stephan

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