I'm writing a 2D graphics application and have run into a problem where my
dirty bounds are getting unioned together to form one larger dirty
bounds. Normally this is a pretty good idea to do, but it's causing
graphics artifacts because its causing half an image to be redrawn even
though it is
The repaint model is more targetted at applications which have
a concept of the current state that needs to be displayed which
tends to be updated mostly atomically. Repainting just a small
rectangle is meant more as an optimization to indicate which
parts of the screen have new data that needs
