user32: Enforce that surfaces are flushed after ReleaseDC.

[Sebastian Lackner]

On 02.03.2015 13:44, Alexandre Julliard wrote:
> Sebastian Lackner <sebastian at fds-team.de> writes:
> 
>> @@ -1116,6 +1116,7 @@ HDC WINAPI GetWindowDC( HWND hwnd )
>>   */
>>  INT WINAPI ReleaseDC( HWND hwnd, HDC hdc )
>>  {
>> +    flush_window_surfaces( FALSE );
>>      return release_dc( hwnd, hdc, FALSE );
>>  }
> 
> I don't think we can afford to do that, we'd be flushing constantly.
> 

Do you have a better idea how to solve that? Even the wine code internally relies on that,
see for example dlls/comctl/animate.c:ANIMATE_AnimationThread.