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

At Mon, 11 Feb 2013 16:41:15 +0100, Philipp Dikmann wrote:
> It appears that the GUI canvas% refreshes itself whenever it receives a 
> mouse-event%.
> 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?

There was a problem with over-eager refresh events for GL canvas on Mac
OS X. I've pushed a repair to our sources, so if you do not yet have a
good enough workaround to v5.3.1, you could try the next nightly build.

Thanks for the report and example!