Jumping or teleporting while levitating in xorn form wouldn't toggle
blocking of levitation when moving from open spots to wall/stone and
unblocking of same when moving the opposite way.
This handles those cases but there are no doubt others. The only
other one I checked was when failed #untrap moves hero onto trap.
That case works correctly--at least after this fix is in place.
Noticed while working on it: change of terrain didn't always update
the status line. When levitation became blocked, it still said Lev
and when unblocked, didn't say that. Next status update got status
condition back in sync.
projects / nethack / commit