[Bug 56972] New: Warlords III: Darklords Rising shows empty screen in virtual desktop

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56972

Bug ID: 56972
           Summary: Warlords III: Darklords Rising shows empty screen in
                    virtual desktop
           Product: Wine
           Version: 9.13
          Hardware: x86-64
               URL: https://store.steampowered.com/app/2916220/Warlords_II
                    I_Darklords_Rising/
                OS: Linux
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: P2
         Component: win32u
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
   Regression SHA1: 03e43434c2bcf6424d60ee9dc1f595aa18714eef
      Distribution: ArchLinux

I bumped into this bug while checking whether bug #53716 still occurs in recent
Wine (yes it does).

Reproduced with the Steam and GOG.com versions.

When initiating a single-player game from the launcher, the sounds of the intro
video can be heard but only the empty virtual desktop can be seen. The screen
remains empty when the game enters the main menu.
Nether in fullscreen mode the game starts properly: switches the desktop to low
resolution, the game icon is present in the taskbar but can't be activated.

The problem is present since
commit 03e43434c2bcf6424d60ee9dc1f595aa18714eef
(win32u: Introduce a new window surface helper to set window shape.)

X.Org X Server 1.21.1.13 on Arch Linux
XFCE 4.18