[3.13] gh-63121: Refresh imaplib capabilities on state changes (GH-152752)#152865
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serhiy-storchaka merged 2 commits intoJul 5, 2026
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…GH-152752) imaplib fetched the server capabilities only once, at connection time. They are now also refreshed after a successful LOGIN or AUTHENTICATE, from the CAPABILITY response the server sent or, if it sent none, by querying it. This lets methods such as enable() see capabilities added after login, for example ENABLE on Gmail (pythongh-103451). Capabilities advertised in the server greeting are now used too, saving a redundant CAPABILITY command. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com> (cherry picked from commit c89b72a)
This was referenced Jul 2, 2026
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# Conflicts: # Lib/test/test_imaplib.py
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Manual backport of #152752; the bot could not cherry-pick cleanly because
3.13's
_get_responsehas a different signature (an unrelated main-onlychange), which was the only conflict. The ported change is otherwise
identical.
imaplib fetched the server capabilities only once, at connection time.
They are now also refreshed after a successful LOGIN or AUTHENTICATE, and
capabilities advertised in the server greeting are used, so methods such
as enable() see capabilities added after login (gh-103451).
(cherry picked from commit c89b72a)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com