largefiles: check unknown files with case awareness of the filesystem stable

largefiles: check unknown files with case awareness of the filesystem

Before this patch, largefiles extension checks unknown files in the
working directory always case sensitively.

This causes failure in updating from the revision X consisting of
'.hglf/A' (and "A" implicitly) to the revision Y consisting of 'a'
(not ".hglf/A") on case insensitive filesystem, because "A" in the
working directory is treated as colliding against and different from
'a' on the revision Y.

This patch uses "repo.dirstate.normalize()" to check unknown files
with case awareness of the filesystem.

--- a/hgext/largefiles/overrides.py	Tue May 07 05:04:11 2013 +0900
+++ b/hgext/largefiles/overrides.py	Tue May 07 05:04:11 2013 +0900
@@ -333,7 +333,7 @@
 # largefiles. This makes the merge proceed and we can then handle this
 # case further in the overridden manifestmerge function below.
 def overridecheckunknownfile(origfn, repo, wctx, mctx, f):
-    if lfutil.standin(f) in wctx:
+    if lfutil.standin(repo.dirstate.normalize(f)) in wctx:
         return False
     return origfn(repo, wctx, mctx, f)
 

--- a/tests/test-casefolding.t	Tue May 07 05:04:11 2013 +0900
+++ b/tests/test-casefolding.t	Tue May 07 05:04:11 2013 +0900
@@ -128,6 +128,8 @@
   $ hg update -q -C 0
   $ hg status -A
   C a
+  $ hg update -q -C 3
+  $ hg update -q 0
 
   $ cd ..