[PATCH v2 4/6] merge: make restore_state() restore staged state too

["Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>]

From: Elijah Newren <newren@gmail.com>

merge can be invoked with uncommitted changes, including staged changes.
merge is responsible for restoring this state if some of the merge
strategies make changes.  However, it was not restoring staged changes
due to the lack of the "--index" option to "git stash apply".  Add the
option to fix this shortcoming.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 builtin/merge.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/builtin/merge.c b/builtin/merge.c
index 8ce4336dd3f..2dc56fab70b 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -383,14 +383,14 @@ static void reset_hard(const struct object_id *oid, int verbose)
 static void restore_state(const struct object_id *head,
 			  const struct object_id *stash)
 {
-	const char *args[] = { "stash", "apply", NULL, NULL };
+	const char *args[] = { "stash", "apply", "--index", NULL, NULL };
 
 	if (is_null_oid(stash))
 		return;
 
 	reset_hard(head, 1);
 
-	args[2] = oid_to_hex(stash);
+	args[3] = oid_to_hex(stash);
 
 	/*
 	 * It is OK to ignore error here, for example when there was
-- 
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