D4322: setdiscovery: don't use dagutil for parent resolution

[yuja (Yuya Nishihara)]

yuja added a comment.


  > +    # TODO this is quadratic
  >  +    parentfn = lambda rev: repo.changelog.children(repo.changelog.node(rev))
  >  +
  >  +    _updatesample(revs, revsroots, sample, parentfn)
  
  Here `parentfn()` returns a list of nodes, which is wrong. But I took this
  since this code is completely rewritten.
  
  Surprisingly, test-setdiscovery.t didn't fail at this revision.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D4322

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