stablesort: use 'depth' in mergepoint tie breaker
The parents with the most depth will is considered lower. It has a couple of
advantages.
1) the more shallow parent probably have less exclusive revision,
2) it makes Oedipus merge behave like close to the linear case,
#require test-repo
$ checkcm() {
> if ! (which check-manifest > /dev/null); then
> echo skipped: missing tool: check-manifest;
> exit 80;
> fi;
> };
$ checkcm
$ cat << EOF >> $HGRCPATH
> [experimental]
> evolution=all
> EOF
Run check manifest:
$ cd $TESTDIR/..
$ check-manifest
lists of files in version control and sdist match