First cut at displaying branch stairs/ladder up/down as ordinary stairs/ladder up/down if the destination hasn't been visited yet. Stepping on stairs with 'mention_decor' enabled, or using ':' when already on them, will report regular stairs' destination level. Probably not very useful since it's just N+1 for downstairs or N-1 for upstairs when currently on level N. It's based on whether the destination level has been visited, not on whether the stairs have been traversed, so reaching a level via trap or level teleporation can make the level's stairs known when their destination really shouldn't be discovered yet.
118 KiB
118 KiB