> ah, the xhost command still works, even though on wayland; I didn't
expect that.

That's because with xhost set, apps fall back to using XWayland. At some
point in the future XWayland will disappear and this hack will no longer
work.

Comments in https://bugzilla.redhat.com/show_bug.cgi?id=1274451 suggest
that the xhost hack opens up potential security holes allowing anything
run by root to connect to your session.

BTW, unlike here, that bug contains an explanation of why the xhost hack
(currently) works.

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https://bugs.launchpad.net/bugs/1712089

Title:
  Invalid MIT-MAGIC-COOKIE-1 keyUnable to init server: Could not
  connect: Connection refused

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