localrepo: fix variable binding in handling of old filters

The lambda was referencing oldfn in outer scope without binding the current
value. If oldfn function were reassigned before use, wrong filters could be
used.

Fixed by having oldfn as named parameter default value of the lambda.

mercurial/localrepo.py

@@ -1907,7 +1907,7 b' class localrepository(object):'
                 # Wrap old filters not supporting keyword arguments
                 if not pycompat.getargspec(fn)[2]:
                     oldfn = fn
-                    fn = lambda s, c, **kwargs: oldfn(s, c)
+                    fn = lambda s, c, oldfn=oldfn, **kwargs: oldfn(s, c)
                     fn.__name__ = 'compat-' + oldfn.__name__
                 l.append((mf, fn, params))
             self._filterpats[filter] = l