[PATCH RFC] Test for apparent regression of merging renamed files

[Ciaran <ciaranj@gmail.com>]

Provides a test to cover a case that appears to have been regressed out by:

 b2c8c0a762745768e8fb249949801c1aed8f7c1d

At this point no tags contain the above commit, but 'master' does.  I'm unsure
what is causing the issue, but can see discussion about this fix here:

http://git.661346.n2.nabble.com/BUG-merge-recursive-triggered-quot-BUG-quot-td6179353.html

Providing a patch to demonstrate the issue and spark discussion.
---
Whilst working up a patch for my 'whitespace ignorant rename
detection' ( http://git.661346.n2.nabble.com/PATCH-RFC-Rename-detection-and-whitespace-td6288524.html
) I was unable to get my tests working, turns out that something that
used to work for me, no longer does in master's HEAD.

I don't really understand the fault so I'm throwing it to the list in
the hope that someone brighter than me can take it on (I've
CC'd the signoff-s to that end! :) Sorry!

 t/t9801-merge-rename.sh |   41 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 41 insertions(+), 0 deletions(-)
 create mode 100755 t/t9801-merge-rename.sh

diff --git a/t/t9801-merge-rename.sh b/t/t9801-merge-rename.sh
new file mode 100755
index 0000000..363911f
--- /dev/null
+++ b/t/t9801-merge-rename.sh
@@ -0,0 +1,41 @@
+#!/bin/sh
+
+test_description='Test for rename merge regression'
+
+. ./test-lib.sh
+
+write_out_files() {
+cat > noformatting.txt << EOF
+if(true){
+// Meaningless
+}
+EOF
+
+cat > formatting.txt << EOF
+	if ( true ) {
+	  // Meaningless
+	}
+EOF
+}
+
+# Test the case where a rename happens in one branch and
+# a whitespace change occurs in a different branch.  The rename
+# change should apply to the whitespace modified file
+test_expect_success setup '
+	write_out_files &&
+	git add formatting.txt &&
+
+	test_tick &&
+	git commit -m Initial &&
+	git checkout -b rename_branch &&
+	git mv formatting.txt formatting_renamed.txt &&
+	git commit -m Rename &&
+	git checkout master &&
+	rm formatting.txt &&
+	mv noformatting.txt formatting.txt &&
+	git commit -a -m Reformat
+'
+test_expect_success 'merge' '
+	git merge rename_branch
+'
+test_done
-- 
1.7.4.1