Noticed recently when a user reported that an unseen monster zapping
an unseen wand caused wand of striking to become discovered. [That was
because the zap also hit a door and the code for the latter didn't check
whether the wand had been seen, and it got fixed a couple of weeks ago.]
When the player zaps wands while the hero is blinded, it was discovering
(for the cases where the effect can be observed without sight) the wand
even though the wand's description was unknown (showed in inventory as
"a wand"). This replaces the calls to makeknown() in zap.c with calls to
new learnwand(), which checks whether the wand description is known; you
no longer discover something you've never seen. Reverse effect has also
been added: if the type of wand has been discovered earlier, zapping an
unseen wand (another of the same type, picked up when blind and zapped
while still blind) will now mark it as seen (to show up in inventory as
"a wand of <whatever>" instead of just a "a wand"). The latter aspect
really ought to be independent of prior discovery, but we currently have
no way to record "we know what this particular item does even though we
don't know what type of item it is yet". [If we add that, it would be
applicable to potions (when operating on stacks) and rings too.]
Minor change: zapping yourself with wand of opening or spell of
knock will remove attached ball&chain rather than give a "chain quivers"
message. Explicitly zapping the chain already did that; if the unlocking
magic works on the chain connected to your leg then it really should also
work on your leg connected to the chain. Zapping unlocking at yourself
probably should also scan inventory to check for carrying locked chests,
but I didn't add that. (If added, then locking magic will need to be
augmented likewise.)
This also fixes <Someone>'s recent complaint: zapping an unknown
wand of teleportation at yourself didn't make it become discovered.
Now it will be, under the same circumstances as when you're riding: if
teleport control causes you to be prompted for destination, or if random
destination moves you more than jumping distance away from your original
position. (The Stunned exception to teleport control, which was missing
in zap_steed, perhaps ought to be moved into the macro definition of
Teleport_control itself so that all code always handles it consistently.)
49084e6deb