[Bug 58210] New: Alpha Protocol (Steam) launcher has grey overlay over buttons

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58210

Bug ID: 58210
           Summary: Alpha Protocol (Steam) launcher has grey overlay over
                    buttons
           Product: Wine
           Version: unspecified
          Hardware: x86-64
               URL: https://store.steampowered.com/app/34010/Alpha_Protoco
                    l/
                OS: Linux
            Status: NEW
          Keywords: regression
          Severity: minor
          Priority: P2
         Component: win32u
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
   Regression SHA1: 3437ba2dea115381217e64fdad6c8496cb8052f8
      Distribution: ArchLinux

This commit reintroduces bug #38975 for me: the buttons in the launcher are
covered with a grey rectangle until you hover the mouse pointer over them (when
the buttons are "uncovered").

commit 3437ba2dea115381217e64fdad6c8496cb8052f8
win32u: Don't redraw window in expose_window_surface() if window has surface.

Happens either in fullscreen or virtual desktop mode.

X.Org X Server 1.21.1.16
XFCE/XFWM 4.20
Nvidia binary drivers 575.51.02