http://bugs.winehq.org/show_bug.cgi?id=15549
--- Comment #2 from Dmitry Timoshkov dmitry@codeweavers.com 2008-10-08 03:55:32 --- (In reply to comment #1)
I've noticed this bug in many programs. Windows mandates to backpaging on, while Linux and several other OS default to it off. Thus, some programs assume that pages that never change will never be lost, and thus will not redraw them when a redraw command is filed. This is a simple architectural difference that could be patched in several ways. I think this should be filed under a wider bug if other people confirm my results on more programs.
It's not clear what you mean by "backpaging", drawing "pages", and "architectural difference". Painting in Wine is implemented internally, and is triggered by repainting requests of applications and X expose events.