If you get interrupted while reading a spellbook and then
the book gets destroyed or you change levels, the object pointer
remembered for the book will be invalid and could accidentally
match one subsequently allocated to some other book. That would
result in "you continue your efforts to memorize the spell" when
starting to read that other book; it would also end up bypassing
the reading difficulty check and reuse the old book's delay counter.
I don't remember who reported this. It was quite some time
ago and I have an abandoned patch dated last March from when I
first started to fix it.
Files patched:
include/extern.h
src/save.c, shk.c, spell.c
auto_credit flag; that's what sell_response is for).
follow-up comment from Pat:
This introduces behavior that I consider to be buggy.
You need something separate from sell_response, otherwise if
you answer (a)ll when the shopkeeper still has money you end
up selling everything for credit without being asked when he
runs out of cash in the middle of the transation. Avoiding
that is the reason for the old behavior in the first place.
