[PATCH 1/2] diff: demonstrate a bug with --patience and --ignore-space-at-eol

[Johannes Schindelin <johannes.schindelin@gmx.de>]

When a single character is added to a line, the combination of these
two options results in an empty diff.

This bug was noticed and reported by Naja Melan.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 t/t4033-diff-patience.sh | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/t/t4033-diff-patience.sh b/t/t4033-diff-patience.sh
index 3c9932e..5f0d0b1 100755
--- a/t/t4033-diff-patience.sh
+++ b/t/t4033-diff-patience.sh
@@ -5,6 +5,14 @@ test_description='patience diff algorithm'
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff-alternative.sh
 
+test_expect_failure '--ignore-space-at-eol with a single appended character' '
+	printf "a\nb\nc\n" >pre &&
+	printf "a\nbX\nc\n" >post &&
+	test_must_fail git diff --no-index \
+		--patience --ignore-space-at-eol pre post >diff &&
+	grep "^+.*X" diff
+'
+
 test_diff_frobnitz "patience"
 
 test_diff_unique "patience"
-- 
2.9.0.278.g1caae67