Fix hunk numbering and a leak in the ssdiff view

A hunk header that states no length was numbered from the wrong
line, and the line a deferred row copied was never freed.

1 file changed, 35 insertions, 0 deletions

diff --git a/tests/t0106-diff.sh b/tests/t0106-diff.sh
index 82b645e..3e0d15c 100755
--- a/tests/t0106-diff.sh
+++ b/tests/t0106-diff.sh
@@ -16,4 +16,39 @@ test_expect_success 'find added line' '
 	grep "<div class=.add.>+5</div>" tmp
 '
 
+# --- Side-by-side line numbers for a hunk that covers a single line ---------
+# git writes the length only when a hunk spans more than one line, so a header
+# reads "@@ -1 +1 @@". Requiring a comma after the number left those hunks
+# numbered from zero, which dropped the line-number link entirely.
+test_expect_success 'set up a repo with single-line hunks' '
+	mkrepo repos/hunk1 1 &&
+	(
+		cd repos/hunk1 &&
+		printf "only\n" >one.txt &&
+		git add one.txt &&
+		git commit -m "add one.txt" &&
+		printf "ONLY\n" >one.txt &&
+		git commit -am "change one.txt"
+	) &&
+	{
+		echo "virtual-root=/" &&
+		echo "cache-size=0" &&
+		echo "repo.url=hunk1" &&
+		echo "repo.path=$PWD/repos/hunk1/.git"
+	} >hunk1rc &&
+	git -C repos/hunk1 diff HEAD~1 HEAD >raw.diff &&
+	grep "^@@ -1 +1 @@" raw.diff
+'
+
+test_expect_success 'ssdiff numbers a comma-less hunk from its real line' '
+	CGIT_CONFIG="$PWD/hunk1rc" QUERY_STRING="url=hunk1/diff/&dt=1" cgit >tmp &&
+	grep "#n1.>1</a>" tmp &&
+	! grep "#n0.>0</a>" tmp
+'
+
+test_expect_success 'ssdiff still numbers a hunk that carries a length' '
+	cgit_query "url=foo/diff&dt=1" >tmp &&
+	grep "#n1.>1</a>" tmp
+'
+
 test_done