From the newsgroup: when invisible and unable to see invisible,
if successful prayer results in being given a spellbook you'll get the
message "an object appears at your feet" but the spellbook won't show on
the map. Add a newsym() to force its location to be updated. (I didn't
try to figure out why spellbooks use place_object() when all other divine
gifts use dropy() but that's why only this case has the display glitch.)
This also fixes up the message vs map update sequencing for a couple
of other "at your feet" cases so that all of them use the same ordering:
first the message is given, then the object drops.
[Timing is the only reason not to put this simple change into 3.4.3.]
7232e52367