[PATCH 4 of 4 python3] posix: always pass a native str to unicodedata.normalize's first arg

[Augie Fackler]

# HG changeset patch
# User Augie Fackler <r...@durin42.com>
# Date 1505519072 14400
#      Fri Sep 15 19:44:32 2017 -0400
# Node ID 4fd8345c78af58b6303a06590a83b8fd6c8fa00f
# Parent  8a1f211ac2afb3e49a15def443b7f556ee3c0d47
posix: always pass a native str to unicodedata.normalize's first arg

diff --git a/mercurial/posix.py b/mercurial/posix.py
--- a/mercurial/posix.py
+++ b/mercurial/posix.py
@@ -379,7 +379,7 @@ if pycompat.sysplatform == 'darwin':
             u = s.decode('utf-8')
 
         # Decompose then lowercase (HFS+ technote specifies lower)
-        enc = unicodedata.normalize('NFD', u).lower().encode('utf-8')
+        enc = unicodedata.normalize(r'NFD', u).lower().encode('utf-8')
         # drop HFS+ ignored characters
         return encoding.hfsignoreclean(enc)
 
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