Kicking a stack splits off one item (except for gold coins) and
propels it, but the range for how far it would move was calculated
before the split using the entire stack's weight. So a large stack of
small items might fail with "thump" (which the report suggested hurt
the hero, but it doesn't) and none of the stack would move. Splitting
sooner looked complicated because of several potential early returns
between the range calculation and the eventual kick, so this hacks the
stack's quantity to get the intended weight instead.
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