At Coverity's urging, I put in an instance of the Fortuna PRNG in
place of the use of rand() to select which drawing area to light up
next on a keypress. But Coverity turns out to be unhappy that I'm
still using rand() to select the _initial_ area, before the user
enters any input at all.
It's even harder to imagine this being a genuine information leak than
the previous complaint. But I don't really see a reason _not_ to
switch it over, now it's been pointed out.
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