[racket] shift/release shift keys in universe module

From: Mitchell Wand (wand at ccs.neu.edu)
Date: Thu Mar 14 21:56:50 EDT 2013

Does releasing a shift key cause a key event in 2htdp/universe ?  I want to
distinguish between ordinary mouse click and shift click.  What I'd like is
to have a sequence like

keyevent:  "shift"  (or "rshift")
mouse-event: button-down [or whatever]
keyevent: ???    (I release the shift key)

I suppose I could experiment to find out, but it's quicker to ask :)

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