[Bug 57715] New: Adobe Illustrator CS6 (16): Splash and About windows render white instead of transparent with Wine 10 hidpi DPIUNAWARE scaling

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57715

            Bug ID: 57715
           Summary: Adobe Illustrator CS6 (16): Splash and About windows
                    render white instead of transparent with Wine 10 hidpi
                    DPIUNAWARE scaling
           Product: Wine
           Version: 10.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs(a)winehq.org
          Reporter: bugs.winehq.org(a)zetafleet.com
      Distribution: Debian

Created attachment 77920
  --> https://bugs.winehq.org/attachment.cgi?id=77920
Trace of application startup

The splash screen and About screen in Adobe Illustrator CS6 render with a white
box for a background instead of the expected transparent background image when
using DPIUNAWARE scaling.

This is not a general issue with DPIUNAWARE scaling and window transparency, as
other apps (like Photoshop CS6 and its splash screen) are rendering OK.

In case it would be useful I have attached a trace with WINEDEBUG=win. The
trace runs from Wine startup until I hit ctrl+c while the broken splash screen
is still visible.

I do not have the wherewithal to try to bisect/regression test at this time but
can provide additional debug logs if that seems helpful. Let me know.

Best regards,

OS: Debian trixie/sid
WM: KWin 6.2.5 (Wayland)
Wine driver: X11 (via XWayland). The white box also appears using the Wayland
driver, but rendering is differently broken (is transparency support in the
Wayland driver missing/incomplete?)

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