send-email: fix non-threaded mails

diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index 603b003edff6d32fe8725f119778658c76c806fb..c32ff6682b932b3d9b270de7260a2671d8d07403 100755 (executable)
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -459,4 +459,15 @@ test_expect_success 'submodule rebase -i' '
        FAKE_LINES="1 squash 2 3" git rebase -i A
 '
 
+test_expect_success 'avoid unnecessary reset' '
+       git checkout master &&
+       test-chmtime =123456789 file3 &&
+       git update-index --refresh &&
+       HEAD=$(git rev-parse HEAD) &&
+       git rebase -i HEAD~4 &&
+       test $HEAD = $(git rev-parse HEAD) &&
+       MTIME=$(test-chmtime -v +0 file3 | sed 's/[^0-9].*$//') &&
+       test 123456789 = $MTIME
+'
+
 test_done