[PATCH v4] completion: ignore chpwd_functions when cding on zsh

Software, such as RVM (ruby version manager), may set chpwd functions
that result in an endless loop when cding.  chpwd functions should be
ignored.

As I've only seen this so far on ZSH, I'm applying this change only to
the git-completion.zsh overrides.

Signed-off-by: Brandon Turner <redacted>
---
As Øystein pointed out, on zsh we can use "cd -q" to ignore
chpwd_functions.

Junio - from my testing, unsetting CDPATH is sufficient on zsh.

 contrib/completion/git-completion.zsh | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/contrib/completion/git-completion.zsh b/contrib/completion/git-completion.zsh
index 9f6f0fa..04ed348 100644
--- a/contrib/completion/git-completion.zsh
+++ b/contrib/completion/git-completion.zsh

@@ -93,6 +93,20 @@ __gitcomp_file ()
 	compadd -Q -p "${2-}" -f -- ${=1} && _ret=0
 }
 
+__git_ls_files_helper ()
+{
+	(
+		test -n "${CDPATH+set}" && unset CDPATH
+		cd -q "$1"
+		if [ "$2" == "--committable" ]; then
+			git diff-index --name-only --relative HEAD
+		else
+			# NOTE: $2 is not quoted in order to support multiple options
+			git ls-files --exclude-standard $2
+		fi
+	) 2>/dev/null
+}
+
 __git_zsh_bash_func ()
 {
 	emulate -L ksh

-- 
2.1.2