Menus: unnecessary repaints?!

[Karl Vogel]

On 06 Jun 2003, you wrote in kde.kde-optimize:

> On Thu, Jun 05, 2003 at 05:32:04PM +0200, Waldo Bastian wrote:
>> and do a scroll+repaint when it has scrolled only a little. Not sure
>> if you will run into problems with invalid areas that need repainting
>> before scrolling though.
>> 
> sure you would (and, fwiw, netscape/moz, openoffice and certainly many
> other apps don't get it right), but invalidating the image if the
> to-be-scrolled part is (partially) obscured should not be that hard in
> theory. of course things get somewhat more complicated if you want to
> do partial scrolls to reuse every single already visible character ...

I've never done any X coding, but doesn't X take care of the layering?! ie. 
can't you just scroll the entire window contents without having to take 
overlapping windows in mind?!