Merge branch 'ps/reflog-migration-with-logall-fix'

The "git refs migrate" command did not migrate the reflog for
refs/stash, which is the contents of the stashes, which has been
corrected.

* ps/reflog-migration-with-logall-fix:
  refs: fix migration of reflogs respecting "core.logAllRefUpdates"

refs.c

@@ -1330,7 +1330,7 @@ int ref_transaction_update_reflog(struct ref_transaction *transaction,
 
 	assert(err);
 
-	flags |= REF_LOG_ONLY | REF_NO_DEREF;
+	flags |= REF_LOG_ONLY | REF_FORCE_CREATE_REFLOG | REF_NO_DEREF;
 
 	if (!transaction_refname_valid(refname, new_oid, flags, err))
 		return -1;

t/t1460-refs-migrate.sh

@@ -224,6 +224,23 @@ do
 			test_commit --date "100003000 +0700" --no-tag -C repo second &&
 			test_migration repo "$to_format"
 		'
+
+		test_expect_success "$from_format -> $to_format: stash is retained" '
+			test_when_finished "rm -rf repo" &&
+			git init --ref-format=$from_format repo &&
+			(
+				cd repo &&
+				test_commit initial A &&
+				echo foo >A &&
+				git stash push &&
+				echo bar >A &&
+				git stash push &&
+				git stash list >expect.reflog &&
+				test_migration . "$to_format" &&
+				git stash list >actual.reflog &&
+				test_cmp expect.reflog actual.reflog
+			)
+		'
 	done
 done