diff: fix regression with --stat and unmerged file

A regression was introduced in 12fc4ad89e (diff.c: use utf8_strwidth() to count display width, 2022-09-14) that causes missing newlines after "Unmerged" entries in `git diff --cached --stat` output. This problem affects v2.39.0-rc0 through v2.39.0. Add the missing newline along with a new test to cover this behavior. Signed-off-by: Peter Grayson <pete@jpgrayson.net> Acked-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Peter Grayson committed Dec 14, 2022 at 12:41 UTC 209d9cb0114dff72e96d58bb3c27409660f1b45c
2 files changed +11 -1
diff.c
+1 -1
@@ -2784,7 +2784,7 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options)
2784 else if (file->is_unmerged) {
2785 strbuf_addf(&out, " %s%s%*s | %*s",
2786 prefix, name, padding, "",
2787 - number_width, "Unmerged");
2787 + number_width, "Unmerged\n");
2788 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2789 out.buf, out.len, 0);
2790 strbuf_reset(&out);
t/t4046-diff-unmerged.sh
+10
@@ -86,4 +86,14 @@ test_expect_success 'diff-files -3' '
86 test_cmp diff-files-3.expect diff-files-3.actual
87 '
88
89 +test_expect_success 'diff --stat' '
90 + for path in $paths
91 + do
92 + echo " $path | Unmerged" || return 1
93 + done >diff-stat.expect &&
94 + echo " 0 files changed" >>diff-stat.expect &&
95 + git diff --cached --stat >diff-stat.actual &&
96 + test_cmp diff-stat.expect diff-stat.actual
97 +'
98 +
99 test_done