[PATCH] completion: fix __gitcomp_builtin no longer consider extra options

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

__gitcomp_builtin() has the main completion list provided by

    git xxx --git-completion-helper

but the caller can also add extra options that is not provided by
--git-completion-helper. The only call site that does this is "git
difftool" completion.

This support is broken by b221b5ab9b (completion: collapse extra
--no-.. options - 2018-06-06), which adds a special value "--" to mark
that the rest of the options can be hidden by default. The commit
forgets the fact that extra options are appended after
"$(git xxx --git-completion-helper)", i.e. after this "--", and will
be incorrectly hidden as well.

Prepend the extra options before "$(git xxx --git-completion-helper)"
to avoid this.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 contrib/completion/git-completion.bash | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index db7fd87b6b..c8fdcf8644 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -400,7 +400,7 @@ __gitcomp_builtin ()
 	if [ -z "$options" ]; then
 		# leading and trailing spaces are significant to make
 		# option removal work correctly.
-		options=" $(__git ${cmd/_/ } --git-completion-helper) $incl "
+		options=" $incl $(__git ${cmd/_/ } --git-completion-helper) "
 		for i in $excl; do
 			options="${options/ $i / }"
 		done
-- 
2.19.1.647.g708186aaf9