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delayed blit was (Re: [pygame] aargh, performance)

Wonder if a screen blit which waits till update/flip
before actually blitting would be useful.  It would
only draw the last blitted areas when multiple blits
cover one area.

There is the alpha problem, in that you can not do
that reliably as you can not know without extra work. 
eg if two alpha images are blit in the same place and
the second image is mostly transparent, then we should
see most of the first image.  However with this blit
method it would not show the first image at all.

Or is something like this allready around in
RenderUpdates ?

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