[Bug 50717] New: Wine places 1x1 pixel window on top of fullscreen window, blocking direct scanout on Wayland

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50717

            Bug ID: 50717
           Summary: Wine places 1x1 pixel window on top of fullscreen
                    window, blocking direct scanout on Wayland
           Product: Wine-staging
           Version: 6.2
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: tempel.julian at gmail.com
                CC: leslie_alistair at hotmail.com, z.figura12 at gmail.com
      Distribution: ---

KWin developer Xaver Hugl found this while investigating the cause of direct
scanout getting blocked with Wine fullscreen windows on Wayland:
"Wine puts a 1x1 pixel big override-redirect window on top of the fullscreen
window that stops direct scanout. I'll add a workaround for now but at first
glance looks like a Wine bug to me."
https://invent.kde.org/plasma/kwin/-/merge_requests/718#note_191539

"I verified that it isn't caused by Xwayland / happens on a normal X session as
well"
https://invent.kde.org/plasma/kwin/-/merge_requests/728#note_191637
(this MR also contains the workaround, and indeed it makes direct scanout work
with Wine)

As a result, performance of fullscreen 3D Wine applications on Kwin Wayland
git-master is negatively affected, as unnecessary compositing affects frame
presentation and causes lots of dropped frames under high GPU load.
It is well possible that this also negatively affects Gnome and Sway Wayland,
but also Gnome unredirecting on Xorg.

-staging and Proton are affected, might also apply to regular wine. It doesn't
matter if WineD3D or DXVK is used (as this probably is very specific to Wine's
window management and not the 3D API).

It looks like if the proper fix was if Wine wouldn't spawn the 1x1 pixel window
on top anymore.

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