[Bug 57582] New: Eschalon Book I: launcher menu flickering

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57582

Bug ID: 57582
           Summary: Eschalon Book I: launcher menu flickering
           Product: Wine
           Version: 10.0-rc1
          Hardware: x86-64
               URL: https://www.moddb.com/games/eschalon-book-i/downloads/
                    eschalon-book-i-1-05-demo
                OS: Linux
            Status: NEW
          Keywords: download, regression
          Severity: minor
          Priority: P2
         Component: winex11.drv
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
   Regression SHA1: 9339e6cc85498576768ddc30150b59b2ec489e20
      Distribution: ---

The game launcher is flashing awfully. The actual game is not affected.

Reverting this commit fixes the problem for me:
commit 9339e6cc85498576768ddc30150b59b2ec489e20
winex11: Set a non-transparent window background pixel color.

Still present in Wine-10.0-rc3
I'm using X.Org X Server 1.21.1.15

eb1_demo_105.exe
md5sum: 5a28511a4d50c9581e987cef887de5ef