narrow: move checking for narrow requirement into _narrowmatch()
We want to move narrowmatch() and others into core, so we need to get
rid of the dependence on the "narrow_opts" from the closure in
narrowrepo.wraprepo(). We can simply check if the narrow requirement
is set. I think that seems like an improvement regardless of moving
narrowmatch().
Differential Revision: https://phab.mercurial-scm.org/D2489
#require docutils gettext
Error: the current ro localization has some rst defects exposed by
moving pager to core. These two warnings about references are expected
until the localization is corrected.
$ $TESTDIR/check-gendoc ro
checking for parse errors
gendoc.txt:58: (WARNING/2) Inline interpreted text or phrase reference start-string without end-string.
gendoc.txt:58: (WARNING/2) Inline interpreted text or phrase reference start-string without end-string.