[PATCH v2 5/6] merge: ensure we can actually restore pre-merge state

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

From: Elijah Newren <newren@gmail.com>

Merge strategies can fail -- not just have conflicts, but give up and
say that they are unable to handle the current type of merge.  However,
they can also make changes to the index and working tree before giving
up; merge-octopus does this, for example.  Currently, we do not expect
the individual strategies to clean up after themselves, but instead
expect builtin/merge.c to do so.  For it to be able to, it needs to save
the state before trying the merge strategy so it can have something to
restore to.  Therefore, remove the shortcut bypassing the save_state()
call.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 builtin/merge.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/builtin/merge.c b/builtin/merge.c
index 2dc56fab70b..aaee8f6a553 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1663,12 +1663,10 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 	 * tree in the index -- this means that the index must be in
 	 * sync with the head commit.  The strategies are responsible
 	 * to ensure this.
+	 *
+	 * Stash away the local changes so that we can try more than one.
 	 */
-	if (use_strategies_nr == 1 ||
-	    /*
-	     * Stash away the local changes so that we can try more than one.
-	     */
-	    save_state(&stash))
+	if (save_state(&stash))
 		oidclr(&stash);
 
 	for (i = 0; !merge_was_ok && i < use_strategies_nr; i++) {
-- 
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