[racket] Keyboard key state

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Mon Oct 15 15:00:49 EDT 2012

It is now possible for the overriding method to hide state from your class. 
I think if you want to enforce this invariant you need an augmentable method. 

On Oct 15, 2012, at 10:45 AM, Danny Yoo wrote:

> 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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