[Bug 3297] New: UpdateWindow() doesn't call XFlush()

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=3297

Summary: UpdateWindow() doesn't call XFlush()
           Product: Wine
           Version: CVS
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: wine-x11driver
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

After an application calls UpdateWindow(), sometimes the window contents doesn't
get updated until the application requests the next event
(GetMessage/PeekMessage). That's because UpdateWindow doesn't flush the X output
queue with XFlush().

I think the best approach would be that UpdateWindow calls GdiFlush, but 
this function is currently not implemented.