--- a/mercurial/match.py	Fri Dec 13 11:21:31 2019 -0800
+++ b/mercurial/match.py	Fri Dec 13 10:31:00 2019 -0800
@@ -229,6 +229,7 @@
     False
     """
     assert os.path.isabs(root)
+    cwd = util.normpath(os.path.join(root, cwd))
     normalize = _donormalize
     if icasefs:
         dirstate = ctx.repo().dirstate