Redrawing the picture on window expose

[Boudewijn Rempt]

I just noticed that when a Krita window is obscured, and then exposed again, 
we go through the complete compose & render routine again. How hard would it 
be to cache the QImage and restore that on window expose?
-- 
Boudewijn Rempt | http://www.valdyas.org/fading/index.cgi
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