0011636: when forgetting a Vehumet offered spell, it does not return to Spell Library

Notes
(0032577) advil (administrator) 2018-08-25 22:37	Just to check, have you found LCS in a book? If not, this is expected behavior, if so, it's a bug.

(0032578) RoGGa (reporter) 2018-08-25 23:10	LCS was not in a book; it was offered by Vehumet as part of the set of the last 3 spells. IMO, any of the last 3 spells should return to the top of Spell Library. Had I known this was the intended behaviour, I would have bought the Book of Annihilations in a Bazaar.

(0032579) RoGGa (reporter) 2018-08-25 23:56	Also, there is no way on the I screen (for memorized spells) to know which ones were offered by Vehumet AND that are not in any of the collected spell books.

(0032580) advil (administrator) 2018-08-25 23:59	ah, possibly one could make this case for his final gift spells. Re the second issue, probably in 0.23 I'll change it so that you can find out what book (or other source) a spell came from.

(0032583) advil (administrator) 2018-08-26 15:16	I came up with a simpler solution: the new forget prompt will also tell you if the spell is not in your library ( https://github.com/crawl/crawl/commit/a8cb661cfcab [^] ). On reflection and a small bit of discussion, I think it's best if all vehumet gifts behave alike, so I don't think special-casing the final three is a good idea. (Of course, an alternative simplification would be just have veh add gifts to your library, but I'll leave that for the moment.)