D1201: dirstate: clean up when restoring identical backups

[krbullock (Kevin Bullock)]

krbullock added subscribers: durham, krbullock.
krbullock accepted this revision as: krbullock.
krbullock added a comment.


  LGTM but I'd like someone with more familiarity with dirstate to have a look too. Maybe @durham ?

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D1201

To: mbthomas, #hg-reviewers, krbullock
Cc: krbullock, durham, mercurial-devel