D1057: filemerge: use arbitraryfilectx for backups

[durin42 (Augie Fackler)]

durin42 added inline comments.

INLINE COMMENTS

> phillco wrote in filemerge.py:604
> I don't think so, because the filectx classes reference the ctx classes in various places.

Ick. Please add a TODO here to figure out a way to break the cycle (it can be done! I'm sure of it, even if I don't yet know how) and then we can move forward with this.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D1057

To: phillco, #hg-reviewers, durin42
Cc: durin42, mercurial-devel