[PATCH 3 of 4 v2] treemanifest: drop 22nd byte for consistency with manifestdict

[Martin von Zweigbergk]

# HG changeset patch
# User Martin von Zweigbergk <martinvonz at google.com>
# Date 1427388141 25200
#      Thu Mar 26 09:42:21 2015 -0700
# Node ID 9c12d179874831c8211309995c44324f0f66efa7
# Parent  c99862a283585e40e907b9116a7736de6a3f4369
treemanifest: drop 22nd byte for consistency with manifestdict

When assigning a 22-byte hash to a nodeid in a manifest, manifestdict
drops the 22nd byte, while treemanifest keeps it. Let's make
treemanifest drop the 22nd byte as well.

diff -r c99862a28358 -r 9c12d1798748 mercurial/manifest.py
--- a/mercurial/manifest.py	Wed Mar 25 14:13:46 2015 -0700
+++ b/mercurial/manifest.py	Thu Mar 26 09:42:21 2015 -0700
@@ -447,7 +447,7 @@
                 self._dirs[dir] = treemanifest(self._subpath(dir))
             self._dirs[dir].__setitem__(subpath, n)
         else:
-            self._files[f] = n
+            self._files[f] = n[:21] # to match manifestdict's behavior
 
     def setflag(self, f, flags):
         """Set the flags (symlink, executable) for path f."""