...
> is a result of tailor svn->darcs gate, and I believe it doesn't use
> amend-record.

I don't think amend-record should be responsible.  It ought to be possible
to reproduce this.  If you grab a repository with one of these two as
the last patch, unrecord and then record again, does it result in the same
diff? (Yes, I could test this myself, but I'm trying to focus on
conflicts...)
-- 
David Roundy
http://www.darcs.net