Monsters spreading out on hide (fixes #1786)

* When you hide and monsters are still on their original chase path, they will no longer spread out
-- This makes Grimtooth mobbing viable again on default settings
-- In all other situations, monsters will still spread out

src/map/mob.c

@@ -1464,6 +1464,7 @@ int mob_unlocktarget(struct mob_data *md, unsigned int tick)
 		unit_set_target(&md->ud, 0);
 	}
 	if (battle_config.official_cell_stack_limit > 0
+		&& (md->min_chase == md->db->range3 || battle_config.mob_ai & 0x8)
 		&& map_count_oncell(md->bl.m, md->bl.x, md->bl.y, BL_CHAR | BL_NPC, 1) > battle_config.official_cell_stack_limit) {
 		unit_walktoxy(&md->bl, md->bl.x, md->bl.y, 8);
 	}