localrepo: use _matchstatus of context objects

Now that we have the machinery in place, we call the context method for
changing the match object in the case of comparing the working directory with
its parent.

This removes the last of the hard-coded workingctx knowledge in localrepo
paving the way for us to remove localrepo.status completely.

mercurial/localrepo.py

@@ -1533,23 +1533,15 b' class localrepository(object):'
             ctx1, ctx2 = ctx2, ctx1
 
         working = ctx2.rev() is None
-        parentworking = working and ctx1 == self['.']
-        match = match or matchmod.always(self.root, self.getcwd())
         listignored, listclean, listunknown = ignored, clean, unknown
 
         # load earliest manifest first for caching reasons
         if not working and ctx2.rev() < ctx1.rev():
             ctx2.manifest()
 
-        if not parentworking:
-            def bad(f, msg):
-                # 'f' may be a directory pattern from 'match.files()',
-                # so 'f not in ctx1' is not enough
-                if f not in ctx1 and f not in ctx1.dirs():
-                    self.ui.warn('%s: %s\n' % (self.dirstate.pathto(f), msg))
-            match.bad = bad
-
         r = [[], [], [], [], [], [], []]
+        match = ctx2._matchstatus(ctx1, r, match, listignored, listclean,
+                                  listunknown)
         r = ctx2._prestatus(ctx1, r, match, listignored, listclean, listunknown)
         r = ctx2._buildstatus(ctx1, r, match, listignored, listclean,
                               listunknown)