The patch indeed seems to have fixed the issue.
But now I've updated to XUbuntu 22.04 with xfce4-panel 4.16.3-1 and the
bug is back, which means that the also needs to be applied there.
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The attachment "patch based on fix from upstream" seems to be a patch.
If it isn't, please remove the "patch" flag from the attachment, remove
the "patch" tag, and if you are a member of the ~ubuntu-reviewers,
unsubscribe the team.
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This is a patch that's equivalent to the solution XFCE merged (only this
comments the code in question out instead of deleting it).
As far as I can tell it fixes the bug, but I'm not 100% sure as the bug
only happened every few days or so on my system. I'll write another
comment here in case the b