narrow: always wrap repo

narrow: always wrap repo

It's simpler to always wrap the repo. This prepares for moving
narrowrepo.narrowmatch() onto localrepo by showing that it's now safe
to always wrap the repo (and thus always define narrowmatch() etc.).

Note that since narrowmatch() returns an always-matcher (rather than
None) in non-narrow repos, this may mean a performance hit when the
narrow extension is enabled because it adds a no-op filtering step in
various places against the always-matcher. I'll restore some of that
soon.

Differential Revision: https://phab.mercurial-scm.org/D2491

--- a/hgext/narrow/__init__.py	Wed Feb 28 10:29:04 2018 -0800
+++ b/hgext/narrow/__init__.py	Wed Feb 28 12:55:05 2018 -0800
@@ -72,8 +72,8 @@
     if not isinstance(repo, localrepo.localrepository):
         return
 
+    narrowrepo.wraprepo(repo)
     if changegroup.NARROW_REQUIREMENT in repo.requirements:
-        narrowrepo.wraprepo(repo)
         narrowcopies.setup(repo)
         narrowdirstate.setup(repo)
         narrowpatch.setup(repo)

--- a/hgext/narrow/narrowcommands.py	Wed Feb 28 10:29:04 2018 -0800
+++ b/hgext/narrow/narrowcommands.py	Wed Feb 28 12:55:05 2018 -0800
@@ -30,7 +30,6 @@
 
 from . import (
     narrowbundle2,
-    narrowrepo,
 )
 
 table = {}
@@ -101,10 +100,6 @@
             '_pullbundle2extraprepare', pullbundle2extraprepare_widen)
 
     def pullnarrow(orig, repo, *args, **kwargs):
-        narrowrepo.wraprepo(repo.unfiltered())
-        if isinstance(repo, repoview.repoview):
-            repo.__class__.__bases__ = (repo.__class__.__bases__[0],
-                                        repo.unfiltered().__class__)
         if opts_narrow:
             repo.requirements.add(changegroup.NARROW_REQUIREMENT)
             repo._writerequirements()