D2489: narrow: move checking for narrow requirement into _narrowmatch()

[indygreg (Gregory Szorc)]

indygreg accepted this revision.
indygreg added a comment.
This revision is now accepted and ready to land.


  Having the requirement imply the use of a narrow matcher seems OK to me. It is easy enough to change if we need something else.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D2489

To: martinvonz, durin42, #hg-reviewers, indygreg
Cc: indygreg, mercurial-devel