[PATCH] ref-filter: fallback on alphabetical comparison

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In ref-filter.c the comparison of refs while sorting is handled by
cmp_ref_sorting() function. When sorting as per numerical values
(e.g. --sort=objectsize) there is no fallback comparison when both refs
hold the same value. This can cause unexpected results as pointed out
by Johannes Sixt ($gmane/280117).

Hence, fallback to alphabetical comparison based on the refname whenever
the other criterion is equal. Fix the test in t3203 in this regard.

Signed-off-by: Karthik Nayak <Karthik.188@xxxxxxxxx>
---
 ref-filter.c             | 2 +-
 t/t3203-branch-output.sh | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/ref-filter.c b/ref-filter.c
index 046e73b..7b33cb8 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -1698,7 +1698,7 @@ static int cmp_ref_sorting(struct ref_sorting *s, struct ref_array_item *a, stru
 		if (va->ul < vb->ul)
 			cmp = -1;
 		else if (va->ul == vb->ul)
-			cmp = 0;
+			cmp = strcmp(a->refname, b->refname);
 		else
 			cmp = 1;
 	}
diff --git a/t/t3203-branch-output.sh b/t/t3203-branch-output.sh
index f77971c..9f2d482 100755
--- a/t/t3203-branch-output.sh
+++ b/t/t3203-branch-output.sh
@@ -158,8 +158,8 @@ EOF
 
 test_expect_success 'git branch `--sort` option' '
 	cat >expect <<-\EOF &&
-	  branch-two
 	* (HEAD detached from fromtag)
+	  branch-two
 	  branch-one
 	  master
 	EOF
-- 
2.6.2

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