[Bug 275445] x11/xwayland-run: wlheadless-run and xwfb-run fail to start without explicit -c cage

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275445

--- Comment #1 from Jan Beich <jbeich@FreeBSD.org> ---
Alternatively, remove the port. It's a simple Python script, easy to run
outside of ports. Without dogfooding and/or an upstream liaison there's no
point. Worse, it's under GPLv2+ to hinder adoption and code sharing with other
projects.

  $ xwayland-run -- foo

is equivalent to

  $ cage Xwayland -noreset :10
  $ DISPLAY=:10 foo

or as one-liner

  $ DISPLAY=:$(Xwayland -terminate -displayfd 1 2>/dev/null &) foo

See also
https://github.com/cage-kiosk/cage/issues/186
https://lists.freebsd.org/archives/freebsd-x11/2023-May/003312.html

xwayland-run doesn't even try to prevent various GUI toolkits from bypassing
rootful Xwayland, creating windows (directly on Cage or parent compositor) that
X11 WM within cannot control. This can be avoided by injecting "env -u
WAYLAND_DISPLAY" but then why use xwayland-run if it doesn't help running apps
within X11 WMs?

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