commit.c: make find_commit_subject() more robust

Just like the pretty printing machinery, we should simply ignore
blank lines at the beginning of the commit messages.

This discrepancy was noticed when an early version of the
rebase--helper produced commit objects with more than one empty line
between the header and the commit message.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

commit.c

@@ -398,7 +398,7 @@ int find_commit_subject(const char *commit_buffer, const char **subject)
 	while (*p && (*p != '\n' || p[1] != '\n'))
 		p++;
 	if (*p) {
-		p += 2;
+		p = skip_blank_lines(p + 2);
 		for (eol = p; *eol && *eol != '\n'; eol++)
 			; /* do nothing */
 	} else

t/t8008-blame-formats.sh

@@ -87,4 +87,21 @@ test_expect_success 'blame --line-porcelain output' '
 	test_cmp expect actual
 '
 
+test_expect_success '--porcelain detects first non-blank line as subject' '
+	(
+		GIT_INDEX_FILE=.git/tmp-index &&
+		export GIT_INDEX_FILE &&
+		echo "This is it" >single-file &&
+		git add single-file &&
+		tree=$(git write-tree) &&
+		commit=$(printf "%s\n%s\n%s\n\n\n  \noneline\n\nbody\n" \
+			"tree $tree" \
+			"author A <a@b.c> 123456789 +0000" \
+			"committer C <c@d.e> 123456789 +0000" |
+		git hash-object -w -t commit --stdin) &&
+		git blame --porcelain $commit -- single-file >output &&
+		grep "^summary oneline$" output
+	)
+'
+
 test_done