Progress Bar: Fix Class Style & Repainting (resend2)

[Alexandre Julliard]

"Dmitry Timoshkov" <dmitry at baikal.ru> writes:

> The problem with Rob's patch is that it causes entire background of
> the progress bar to be repainted. Some time ago (3 years or like that)
> I wrote tests for progress bar and found that it invalidates background
> only when (oldPos < newPos) and it really has a separate WM_ERASEBKGND
> handler. Since then my code has been removed and rewritten (by you
> Alexandre) for no obvious reason IMO.

The reason was precisely to avoid flicker in certain cases (I believe
it was during the MS Office install).

-- 
Alexandre Julliard
julliard at winehq.org