- From a bug report, there are ways to, for example, steal items
from Medusa without waking her, by clever use of Conflict.
Avoid this by removing STRAT_WAITFORU when such an attack succeeds
- it was theoretically possible to use a similar approach to steal from a
STRAT_WAITFORU monster without it noticing while polymorphed and very fast,
so bulletproof this case as well. Simpler because failed attacks wake too.
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