fix: use scmutil.movedirstate() instead of reimplementing
I wrote this patch 2 years ago as a little cleanup. I wanted to
generally used `scmutil.movedirstate()` instead of manually updating
the dirstate because that is easy to get wrong. I didn't know until
today that the current code had a bug. So I added the test case two
patches before this one and dusted off this one patch. This is a
little slower than the previous code, as it diffs two
manifests. However, it fixes the bug and I don't think it's going to
be noticeably slower anyway.
Differential Revision: https://phab.mercurial-scm.org/D11210
cat >> $HGRCPATH <<EOF
[extensions]
narrow=
[ui]
ssh="$PYTHON" "$RUNTESTDIR/dummyssh"
[experimental]
changegroup3 = True
EOF