[Bug 1012858]

[Bernie Innocenti]

I have experienced this bug for several years on multiple Linux
machines.

It just happened to me today on Thunderbird 89.0b1 (beta): sending a
message over SMTP hung for several minutes while the progressbar keeps
on scanning left and right,  eating ~60% CPU on a fast machine.

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https://bugs.launchpad.net/bugs/1012858

Title:
  "Sending of message failed" dialog needs 100% of one CPU as long as it
  is open.

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