[3.13] gh-142006: Fix HeaderWriteError in email.policy.default caused by extra newline (GH-142008)#142362
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bitdancer merged 1 commit intopython:3.13from Dec 6, 2025
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…by extra newline (pythonGH-142008) RDM: This fixes a subtle folding error that showed up when a token exactly filled a line and was followed by whitespace and a token with no folding whitespace that was longer than a line. In this particular circumstance the whitespace after the first token got pushed on to the next line, and then stolen to go in front of the next unfoldable token...leaving a completely empty line in the line buffer. That line got turned in to a newline, which is RFC illegal, and the newish security check caught it. The fix is to just delete that empty line from the buffer. (cherry picked from commit 07eff89) Co-authored-by: Paresh Joshi <[email protected]> Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
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RDM: This fixes a subtle folding error that showed up when a token exactly filled a line and was followed by whitespace and a token with no folding whitespace that was longer than a line. In this particular circumstance the whitespace after the first token got pushed on to the next line, and then stolen to go in front of the next unfoldable token...leaving a completely empty line in the line buffer. That line got turned in to a newline, which is RFC illegal, and the newish security check caught it. The fix is to just delete that empty line from the buffer.
(cherry picked from commit 07eff89)
Co-authored-by: Paresh Joshi [email protected]
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>