[Bug 1932328]

[Ddl-github]

I didn't want to switch back to Xorg, so I found a clunky workaround:

* Select File -> Send Later (ctl-shift-enter):  message is saved to Outbox.
* Select File -> Send Unsent Messages.

This method does not generate a ghost window.  But wow, it's annoying.
I had to remove the "Send" button from the Composition toolbar to keep
me from reflexively clicking Send.

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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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