"Wayland to X Recording bridge" is shown as a white tiled window

[ids1024]

https://invent.kde.org/system/xwaylandvideobridge autostarts through /etc/xdg/autostart. But on Cosmic-comp, instead of being hidden it shows up as a normal window, all white.

This may reflect a few Xwayland issues. So it would be good to fix this specifically, but it also seems like a nice small test case for some Xwayland things that may impact other applications.

https://invent.kde.org/system/xwaylandvideobridge/-/blob/master/src/contentswindow.cpp

Not sure why the setOpacity(0); doesn't work. I would have though XWayland just turns that into a transparent Wayland surface without the compositor needing to do anything.

KX11Extras::setState(winId(), NET::SkipTaskbar | NET::SkipPager | NET::SkipSwitcher);

This shouldn't show in things like cosmic-workspaces. Either the workspaces protocol needs to pass through these flags, or with an X window ID, clients could fetch that and other things (like the window icon) from the X server themselves. The former is probably better, though it does mean more protocol bloat.

Or the compositor could have some heuristic to decide which X windows should just be omitted from the top-level info protocol altogether, which would probably make sense at least in this case.

Presumably things like i3 and sway have some heuristic that recognizes that a window like this should not be tiled, even though it's technically visible and has a size. Maybe that's related to setFlag(Qt::Dialog);.