url: handle file://localhost/c:/foo "correctly"

The path was parsed correctly, but localpath prepended an extra '/' (as in
'/c:/foo') because it assumed it was an absolute unix path.

mercurial/util.py

@@ -1708,7 +1708,8 b' class url(object):'
             # letters to paths with drive letters.
             if hasdriveletter(self._hostport):
                 path = self._hostport + '/' + self.path
-            elif self.host is not None and self.path:
+            elif (self.host is not None and self.path
+                  and not hasdriveletter(path)):
                 path = '/' + path
             return path
         return self._origpath

tests/test-url.py

@@ -223,6 +223,14 b' def test_url():'
     >>> u.localpath()
     'f:oo/bar/baz'
 
+    >>> u = url('file://localhost/f:oo/bar/baz')
+    >>> u
+    <url scheme: 'file', host: 'localhost', path: 'f:oo/bar/baz'>
+    >>> str(u)
+    'file://localhost/f%3Aoo/bar/baz'
+    >>> u.localpath()
+    'f:oo/bar/baz'
+
     >>> u = url('file:foo/bar/baz')
     >>> u
     <url scheme: 'file', path: 'foo/bar/baz'>