The reference app keeps the inner radius of a star constant when Ctrl
or Command is held after the drag starts. VectorCraft's Star tool took
the held radius from the first drag event that carried the key, using
that event's outer radius. The canvas sends a drag only once the
pointer moves, so a key pressed with the pointer still scaled the
inner radius with the next move before holding it.
Ctrl/Cmd now holds the inner radius the star showed at the last drag
position before the key went down, with Alt's straight shoulders when
Alt was held. A new press and Escape clear the held radius. Before,
after a drag canceled with Escape, the next star took the canceled
star's inner radius when Ctrl/Cmd went down before that star's first
drag event.
Docs: docs/target-app-parity.md.
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