[PATCH v2] diff: Only count lines in show_shortstats

Do not mix byte and line counts. Binary files have byte counts;
skip them when accumulating line insertions/deletions.

The regression was introduced in e18872b.

Signed-off-by: Alexander Strasser <redacted>
---

 Zbigniew, Junio:
   I hope I did submit the patch correctly this time.

   This is a reroll with the following differences to v1:

   * I changed the additional test for t4012 to adhere to modern
     style on request by Zbigniew. I had the impression this might
     be in conflict with Junio's comment
     "Style fixes should be done later after dust from more important
      changes (e.g. a bugfix) settles."
     But maybe that was directed at modernizing the remaining of
     parts of that test file.
   * I deleted the 2-space indent in the commit message paragraphs
   * I omitted the parenthesis in the subject message

   The above points are the reason I resent this for discussion to
 the list.

   I apologize for the long delay, some misunderstandings on my side
 made me think the initial submission was considered for inclusion.

 diff.c                 | 2 +-
 t/t4012-diff-binary.sh | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/diff.c b/diff.c
index 77edd50..1a594df 100644
--- a/diff.c
+++ b/diff.c

@@ -1700,7 +1700,7 @@ static void show_shortstats(struct diffstat_t *data, struct diff_options *option
 			continue;
 		if (!data->files[i]->is_renamed && (added + deleted == 0)) {
 			total_files--;
-		} else {
+		} else if (!data->files[i]->is_binary) { /* don't count bytes */
 			adds += added;
 			dels += deleted;
 		}

diff --git a/t/t4012-diff-binary.sh b/t/t4012-diff-binary.sh
index 8b4e80d..7d03c1d 100755
--- a/t/t4012-diff-binary.sh
+++ b/t/t4012-diff-binary.sh

@@ -36,6 +36,12 @@ test_expect_success '"apply --stat" output for binary file change' '
 	test_i18ncmp expected current
 '
 
+test_expect_success 'diff --shortstat output for binary file change' '
+	echo " 4 files changed, 2 insertions(+), 2 deletions(-)" >expected &&
+	git diff --shortstat >current &&
+	test_i18ncmp expected current
+'
+
 test_expect_success 'apply --numstat notices binary file change' '
 	git diff >diff &&
 	git apply --numstat <diff >current &&

-- 
1.7.10.2.552.gaa3bb87