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Windows was still doing it that way into 00s in XP and 2003, and you could observe it when apps would get a hang in their windows loop, and couldn't process WM_PAINT anymore - you'd get ghosting artifacts moving other windows over the one hanging, because it wouldn't repaint the invalidated areas. It wasn't until Vista that such windows would be rendered using the ghosted version of the last known good state (cached by the compositor).





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