[Bug 1932328]

[Ddl-github]

Confirming this bug persists in TB 91 under Pop!_OS 21.10.  A fix for
this was apparently
[committed](https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2027)
several months ago, but (per [this
comment](https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1932328/comments/64))
users will not see it until updating to gnome 40.6.

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https://bugs.launchpad.net/bugs/1932328

Title:
  Thunderbird under Wayland does not correctly close (or manage) windows

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