D1679: rebase: fix for hgsubversion

[yuja (Yuya Nishihara)]

yuja added a comment.


  In https://phab.mercurial-scm.org/D1679#28814, @phillco wrote:
  
  > @yuja is that just because of the `_manifest` property cache, or are there others as well?
  
  
  Others, too. workingctx._parents() for example.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D1679

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