gc --aggressive: make it really aggressive

The default was not to change the window or depth at all.  As suggested
by Jon Smirl, Linus Torvalds and others, default to

	--window=250 --depth=250

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Acked-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin-gc.c b/builtin-gc.c
index 8d990ed..fc556ed 100644
--- a/builtin-gc.c
+++ b/builtin-gc.c
@@ -23,7 +23,7 @@
 };
 
 static int pack_refs = 1;
-static int aggressive_window = -1;
+static int aggressive_window = 250;
 static int gc_auto_threshold = 6700;
 static int gc_auto_pack_limit = 50;
 static const char *prune_expire = "2.weeks.ago";
@@ -200,6 +200,7 @@
 
 	if (aggressive) {
 		append_option(argv_repack, "-f", MAX_ADD);
+		append_option(argv_repack, "--depth=250", MAX_ADD);
 		if (aggressive_window > 0) {
 			sprintf(buf, "--window=%d", aggressive_window);
 			append_option(argv_repack, buf, MAX_ADD);