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[racket] Keyboard key state

From: Danny Yoo (dyoo at hashcollision.org)
Date: Mon Oct 15 10:45:26 EDT 2012		 
Oh, I forgot about allowing the subclass to process the events too!
Add the following to the end of the on-subwindow-char method:

    (super on-subwindow-char receiver key-event)

Full source code is here:

    https://gist.github.com/3892860
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