Bug? Files are losing history after subtree merge

[Ralf Thielow <ralf.thielow@gmail.com>]

Hi,

recently I did a merge where a complete repo shall be
merged into a specific directory of another repo. I
tried both the "subtree" merge strategy and the option
"-Xsubtree=<dir>" of "recursive". I noticed that in both
cases somehow the history of single files were lost
during these merges (with history I mean 'git log <file>'
and 'git log --follow <file>'). I've worked around this
by merging without 'subtree' and moving the dirs/files
manually. In this case the file history was there.

I've added a test case below for that behaviour. It doesn't
catch "-S recursive -Xsubtree=<dir>" but it should show
the issue (hopefully:).

Ralf
---
 t/t6029-merge-subtree.sh | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/t/t6029-merge-subtree.sh b/t/t6029-merge-subtree.sh
index 73fc240..e9a97d7 100755
--- a/t/t6029-merge-subtree.sh
+++ b/t/t6029-merge-subtree.sh
@@ -61,6 +61,14 @@ test_expect_success 'initial merge' '
 	test_cmp expected actual
 '
 
+test_expect_failure 'file keeps history after subtree merge' '
+	cd ../git-gui &&
+	git log --follow git-gui.sh >../git/expected &&
+	cd ../git &&
+	git log --follow git-gui/git-gui.sh >actual &&
+	test_cmp expected actual
+'
+
 test_expect_success 'merge update' '
 	cd ../git-gui &&
 	echo git-gui2 > git-gui.sh &&
-- 
1.8.4.652.g0d6e0ce