Don't scale diff stat when not needed

src/diff_stats.c

@@ -284,6 +284,8 @@ int git_diff_stats_to_buf(
 			if (width < STATS_FULL_MIN_SCALE)
 				width = STATS_FULL_MIN_SCALE;
 		}
+		if (width > stats->max_filestat)
+			width = 0;
 
 		for (i = 0; i < stats->files_changed; ++i) {
 			if ((delta = git_diff_get_delta(stats->diff, i)) == NULL)

tests/diff/stats.c

@@ -54,6 +54,10 @@ void test_diff_stats__stat(void)
 	cl_git_pass(git_diff_stats_to_buf(&buf, _stats, GIT_DIFF_STATS_FULL, 0));
 	cl_assert(strcmp(git_buf_cstr(&buf), stat) == 0);
 	git_buf_free(&buf);
+
+	cl_git_pass(git_diff_stats_to_buf(&buf, _stats, GIT_DIFF_STATS_FULL, 80));
+	cl_assert(strcmp(git_buf_cstr(&buf), stat) == 0);
+	git_buf_free(&buf);
 }
 
 void test_diff_stats__multiple_hunks(void)