It looks like Thunderbird itself has a bug with wrapping in plain text.
If I disable all addons ("thunderbird -safe-mode") and then edit a
draft, Thunderbird wraps it to about mailnews.wraplength-12 (60, if 72
(the default) is configured).
This appears to get applied after any addon handling (like with Enigmail
and External Editor), or when re-editing a draft.
TEST CASE:
1. Create a new message (plain text)
2. Enter the following text:
1 3 5 7 9 1 3 5 7 9 1 3 5 7 9 1 3 5 7 9 1 3 5 7 9 1 3 5 7 9 1 3 5 7 9 1 3 5 7 9
1 3 5 7 9
3. Thunderbird will wrap it after 60 chars, although 72 is configured
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https://bugs.launchpad.net/bugs/1017563
Title:
Enigmail uses mailnews.wraplength unconditionally when signing
(ignoring "Enable Word Wrap" setting from the "Toggle Word Wrap"
addon)
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https://bugs.launchpad.net/enigmail/+bug/1017563/+subscriptions
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