show --stat: use the full terminal width

Make show --stat behave like diff --stat and use the full terminal
width.

Signed-off-by: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/log.c

@@ -447,6 +447,8 @@ int cmd_show(int argc, const char **argv, const char *prefix)
 	rev.diff = 1;
 	rev.always_show_header = 1;
 	rev.no_walk = 1;
+	rev.diffopt.stat_width = -1; 	/* Scale to real terminal size */
+
 	memset(&opt, 0, sizeof(opt));
 	opt.def = "HEAD";
 	opt.tweak = show_rev_tweak_rev;

t/t4052-stat-output.sh

@@ -97,7 +97,7 @@ do
 done <<\EOF
 ignores expect80 format-patch -1 --stdout
 respects expect200 diff HEAD^ HEAD --stat
-ignores expect80 show --stat
+respects expect200 show --stat
 ignores expect80 log -1 --stat
 EOF
 
@@ -163,7 +163,7 @@ do
 done <<\EOF
 ignores expect80 format-patch -1 --stdout
 respects expect200 diff HEAD^ HEAD --stat
-ignores expect80 show --stat
+respects expect200 show --stat
 ignores expect80 log -1 --stat
 EOF