D441: revset: optimize "draft() & ::x" pattern

[quark (Jun Wu)]

quark added inline comments.

INLINE COMMENTS

> dagop.py:93
> +        pfunc = lambda rev: filter(keepfunc, plainpfunc(rev))
> +        revs = smartset.filteredset(revs, keepfunc)
>      return _walkrevtree(pfunc, revs, startdepth, stopdepth, reverse=True)

Could use `revs.filter` instead.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D441

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