[PATCH] stash drops the stash even if creating the branch fails because it already exists

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This bug was disovered by someone on IRC when he tried to 'git stash branch <branch> <stash>'
while <branch> already existed. In that case the stash is dropped even though it isn't
applied on any branch, so the stash is effectively lost. I think that shouldn't happen,
so here is a test.

---
 t/t3903-stash.sh |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 9ed2396..0f6b2e4 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -545,4 +545,15 @@ test_expect_success 'invalid ref of the form stash@{n}, n >= N' '
 	git stash drop
 '
 
+test_expect_failure 'stash branch should not drop the stash if the branch exists' '
+	git stash clear &&
+	echo foo > file &&
+	git add file &&
+	git commit -m initial &&
+	echo bar > file &&
+	git stash &&
+	test_must_fail git stash branch master stash@{0} &&
+	git rev-parse stash@{0} --
+'
+
 test_done
-- 
1.7.3.3.gd2416

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