Bug: Saving and Installing area eats everything in the room.
Danger: Trivial - Eats all objects and mobs in a room when saving and installing.
Found by: Banner
Fixed by: Kayle

---

build.c, fold_area
Locate:

       // purge room of (prototyped) mobiles 
      for( victim = room->first_person; victim; victim = vnext )
      {
         vnext = victim->next_in_room;
         if( IS_NPC( victim ) )
            extract_char( victim, TRUE );
      }

      // purge room of (prototyped) objects 
      for( obj = room->first_content; obj; obj = obj_next )
      {
         obj_next = obj->next_content;
         extract_obj( obj );
      }

Replace with:

       // purge room of (prototyped) mobiles 
      for( victim = room->first_person; victim; victim = vnext )
      {
         vnext = victim->next_in_room;
         if( IS_NPC( victim ) && IS_SET( victim->act, ACT_PROTOTYPE ) )
            extract_char( victim, TRUE );
      }

      // purge room of (prototyped) objects 
      for( obj = room->first_content; obj; obj = obj_next )
      {
         obj_next = obj->next_content;
         if( IS_SET( obj->extra_flags, ITEM_PROTOTYPE ) )
            extract_obj( obj );
      }

For most instances this is trivial. But the comments say it should only be removing prototype items and mobs and now it does.