D6675: copies: fix crash on in changeset-centric tracing from commit to itself

[martinvonz (Martin von Zweigbergk)]

martinvonz added a comment.


  Intended for stable.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D6675/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D6675

To: martinvonz, #hg-reviewers
Cc: mercurial-devel