[plt-scheme] double on-paint

Hi there,

On Windows XP, with DrScheme v360, the following code:

(define f (new frame% (label "Hello")))

(define c (new canvas% (parent f)
               (paint-callback (lambda _ (printf "painting~n")))))

(send f show #t)

Will print "painting" twice, with a noticeable delay between the two
messages, every time the frame is resized. That's not right is it?

-pp
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