[3.13] gh-144156: Fix email header folding concatenating encoded words (GH-144692)#145195
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bitdancer merged 1 commit intopython:3.13from Feb 24, 2026
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…d words (pythonGH-144692) The fix for pythongh-92081 (pythongh-92281) was unfortunately flawed, and broke whitespace handling for encoded word patterns that had previously been working correctly but had no corresponding tests, unfortunately in a way that made the resulting headers not RFC compliant, in such a way that Yahoo started rejecting the resulting emails. This fix was released in 3.14 alpha 1, 3.13 beta 2 and 3.12.5. This PR fixes the original problem in a way that does not break anything, and in fact fixes a small pre-existing bug (a spurious whitespace after the ':' of the header label if the header value is immediately wrapped on to the next line). (RDM) (cherry picked from commit 0f7cd55) Co-authored-by: Robsdedude <dev@rouvenbauer.de> Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com> Co-authored-by: R. David Murray <rdmurray@bitdance.com>
This was referenced Feb 24, 2026
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The fix for gh-92081 (gh-92281) was unfortunately flawed, and broke whitespace handling for encoded word patterns that had previously been working correctly but had no corresponding tests, unfortunately in a way that made the resulting headers not RFC compliant, in such a way that Yahoo started rejecting the resulting emails. This fix was released in 3.14 alpha 1, 3.13 beta 2 and 3.12.5. This PR fixes the original problem in a way that does not break anything, and in fact fixes a small pre-existing bug (a spurious whitespace after the ':' of the header label if the header value is immediately wrapped on to the next line). (RDM)
(cherry picked from commit 0f7cd55)