copies: fix up "fullcopy" with missing entries from "diverge"
Similar to the previous patch, but this doesn't even affect tests. It
does affect tests if you change them to turn on debug logging. I'm
fixing it here so reviewers of the later rewrite patch can hard-code
debug logging to be on and more easily compare test results.
Differential Revision: https://phab.mercurial-scm.org/D6247
#require docutils gettext
$ $TESTDIR/check-gendoc it
checking for parse errors