[racket] how to stop canvas% from refreshing after on-event

From: Philipp Dikmann (philipp at dikmann.de)
Date: Mon Feb 11 10:41:15 EST 2013

It appears that the GUI canvas% refreshes itself whenever it receives a 
I intend to refresh the canvas at a steady pace (using a timer%) and 
independently of any mouse-events instead.
Is there a reasonable way to suppress the default behavior?

Thanks for your time,

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