[PATCH v2 4/4] rebase -r: fix merge -c with a merge strategy

["Phillip Wood via GitGitGadget" <gitgitgadget@gmail.com>]

From: Phillip Wood <phillip.wood@dunelm.org.uk>

If a rebase is started with a --strategy option other than "ort" or
"recursive" then "merge -c" does not allow the user to reword the
commit message.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
---
 sequencer.c              |  5 ++++-
 t/t3430-rebase-merges.sh | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/sequencer.c b/sequencer.c
index c2cba5ed4b1..a19980f62d9 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -3934,7 +3934,10 @@ static int do_merge(struct repository *r,
 				strvec_pushf(&cmd.args,
 					     "-X%s", opts->xopts[k]);
 		}
-		strvec_push(&cmd.args, "--no-edit");
+		if (!(flags & TODO_EDIT_MERGE_MSG))
+			strvec_push(&cmd.args, "--no-edit");
+		else
+			strvec_push(&cmd.args, "--edit");
 		strvec_push(&cmd.args, "--no-ff");
 		strvec_push(&cmd.args, "--no-log");
 		strvec_push(&cmd.args, "--no-stat");
diff --git a/t/t3430-rebase-merges.sh b/t/t3430-rebase-merges.sh
index 183c3a23838..43c82d9a33b 100755
--- a/t/t3430-rebase-merges.sh
+++ b/t/t3430-rebase-merges.sh
@@ -187,6 +187,24 @@ test_expect_success 'merge -c commits before rewording and reloads todo-list' '
 	check_reworded_commits E H
 '
 
+test_expect_success 'merge -c rewords when a strategy is given' '
+	git checkout -b merge-c-with-strategy H &&
+	write_script git-merge-override <<-\EOF &&
+	echo overridden$1 >G.t
+	git add G.t
+	EOF
+
+	PATH="$PWD:$PATH" \
+	GIT_SEQUENCE_EDITOR="echo merge -c H G >" \
+	GIT_EDITOR="echo edited >>" \
+		git rebase --no-ff -ir -s override -Xxopt E &&
+	test_write_lines overridden--xopt >expect &&
+	test_cmp expect G.t &&
+	test_write_lines H "" edited "" >expect &&
+	git log --format=%B -1 >actual &&
+	test_cmp expect actual
+
+'
 test_expect_success 'with a branch tip that was cherry-picked already' '
 	git checkout -b already-upstream main &&
 	base="$(git rev-parse --verify HEAD)" &&
-- 
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