[racket] Screenshot in OS X

Hi All,

I have extended the screenshot code. Now it is possible to
capture both the entire display and a single window.
As an example I have recreated the images in the
widget gallery (in the gui docs). I notice that combo-field%
and editor-canvas behave differently on OS X and GTK(?).
On OS X the example text is missing. See the attached
screenshot.

Any ideas why?

Also the left side of the combo box looks strange.

The code is here:
    https://gist.github.com/019d30cfed891b1899b9

I tested on Mountain Lion (64 bit).

-- 
Jens Axel Søgaard
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