[Bug 1012858]

[PeterPall]

- Updated my thunderbird to the newest Version (Thunderbird 68/Ubuntu)
- Set my "saved messages" folder to an imap one
- turned my Internet connection off
- Pressed Ctrl+S
- The progressbar went forth and back using 100% of one CPU
- Re-enabled my internet. The progressbar still goes haywire using 100% of one CPU as the message dialogue telling the message could not be saved is still active.
- Started the profiler
The profiler result should be downloadable here: https://perfht.ml/30UuI1F

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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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