Upstream has fixed that problem long time ago.
https://mail.gnome.org/archives/commits-list/2014-September/msg04244.html
As Xenial now only receive 'security' updates, but use mutter 3.18.x
which should include the fix, if your system still log that error, then
its time to clean the system and/or reconfigure mutter & associated
packages. At last recent ubuntu versions are not spammed with this
problem.
** Changed in: mutter
Importance: Unknown => Undecided
** Changed in: mutter
Remote watch: Debian Bug tracker #776018 => None
** Changed in: mutter
Status: New => Fix Released
** Changed in: ubuntu-gnome
Status: Triaged => Fix Released
** Changed in: mutter (Fedora)
Importance: Unknown => Undecided
** Changed in: mutter (Fedora)
Status: Unknown => New
** Changed in: mutter (Fedora)
Remote watch: Red Hat Bugzilla #1280194 => None
** Changed in: mutter (Fedora)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1425349
Title:
STACK_OP_RAISE_ABOVE: window not in stack
To manage notifications about this bug go to:
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