W. Trevor King added the comment:
The troublesome header formatting is:
>>> import email.policy
>>> email.policy.SMTP.fold_binary('Cc',
'notmuch\n\t<public-public-notmuch-gxuj+Tv9EO5zyzON3hdc1g-wOFGN7rlS/M9smdsby/[email protected]>,\n\[email protected],\n\tRainer
M Krug <[email protected]>,\n\tJeremy
Nickurak\n\t<public-public-not-much-kexSNQTsIoD754YsiR0rpA-wOFGN7rlS/M9smdsby/[email protected]>')
Traceback (most recent call last):
…
RuntimeError: maximum recursion depth exceeded while getting the str of an
object
Trimming that down a bit, a minimal trigger seems to be:
>>> email.policy.SMTP.fold_binary('Cc',
'a\n\taaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n\ta')
Traceback…
Where removing much of anything gives a working fold.
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<http://bugs.python.org/issue22684>
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