Could someone take a look at the ambush code and how it handles invises? At
the moment atleast I am experiencing some quite interesting effects.
I entered a room with various aggressive monsters. None of them attacked me,
while I was quickly reading the roomdesc (which took some 15 seconds). When I
then tried to leave, I suddenly got ambushed and the monsters attacked me,
which is very nice of them especially because they didn't seem to see me
before my futile leaving attempt.