[racket] Missing turtle

From: Jens Axel Søgaard (jensaxel at soegaard.net)
Date: Sun Feb 26 14:48:12 EST 2012

The problem seems to be, that the only place draw-turtle-icons
is called is in on-paint. This event is only called when

>         Specification: Called when the canvas is exposed or
>         resized so that the image in the canvas can be repainted.

And indeed if one issues commands in the repl and then resizes the
window, the orange triangle is updated.

Jens Axel Søgaard
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