If the character was invisible without being able to see invisible,
his location on the map showed any object there or underlying topology
instead of the hero even when monsters could be seen with infravision,
ESP, or sustained monster detection. The ESP case required an amulet
or helm or quest artifact to be noticeable because being blind overrides
being unable to see invisible, so the more common form of telepathy
didn't exhibit this behavior.
<Someone> wrote:
> Linux, Redhat 7.1 nethack 3.4.0
>
>Please see attached patch file.
>
>I'm attempting to move more stuff into the "read-only" area, in
>preparation for a port to another OS.
<Someone> reported this during 3.4.0 beta. If you are blind and levitating,
unseen monsters are shown as "I", just like when not levitating, but they
are never erased after they move, unlike not levitating. Display this
case correctly as well.