Re: Un-paged commit messages in git filter-branch's commit-filter?

Jeff King [off-list ref] wrote:

I don't recall offhand whether git-svn does line-wrapping or any other
commit-message munging.

Definitely no line-wrapping.  Munging is minimal:
it respects i18n.commitencoding, adds a trailing newline,
and "git-svn-id:" line.