GeezerVison

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Have things been fixed so that unmodified headers are never refolded? If that has been done, then this works. However, if it is still the case that long headers get refolded when rendering an existing (not a new) message, then this will break re-rendering existing signed messages, which was the point of the original fix. The correct fix, obviously, is to never refold header lines that have not been modified since the message was deserialized, which is what I should have done originally (hindsight is wonderful :)

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This PR is stale because it has been open for 30 days with no activity.

This PR has been blocked on an unsigned CLA for more than 12 months and cannot be merged until all commit authors sign. Closing to cull the number of open pull requests. Do not reopen this pull request without signing the CLA first and getting a go-ahead from a triager or core developer on gh-99533.