While testing the hiding vs traps patch, I became a mimic and hid.
It gets stuck to you.
Huh? Nothing was visible; nothing became visible (aside from the ']' at my
position changing back to 'm'). Display the invisible monster glyph when
an unseen monster bumps into you while you're hiding or mimicking gold.
That's usually handled by the hit and miss routines, but they aren't used
when you're just brought out of hiding instead of attacked.
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