narrow: avoid looking up dirstate again when editing dirstate

The narrow extension overrides the dirstate editing functions to
restrict paths outside the narrowspec. These overrides access the
dirstate from repo.dirstate instead of using the "self" reference
passed to the overridden functions. I don't see a reason for this and
it caused me problems with a later patch (it caused infinite recursion
when I modified localrepo.dirstate()), so let's change it.

Differential Revision: https://phab.mercurial-scm.org/D4829

hgext/narrow/narrowdirstate.py

@@ -18,10 +18,9 b' def wrapdirstate(repo, dirstate):'
 
     def _editfunc(fn):
         def _wrapper(self, *args):
-            dirstate = repo.dirstate
             narrowmatch = repo.narrowmatch()
             for f in args:
-                if f is not None and not narrowmatch(f) and f not in dirstate:
+                if f is not None and not narrowmatch(f) and f not in self:
                     raise error.Abort(_("cannot track '%s' - it is outside " +
                         "the narrow clone") % f)
             return fn(self, *args)