[racket] Disable dragging on Pasteboard%

From: Richard Adler (adler.richard at googlemail.com)
Date: Sun Feb 15 10:26:34 EST 2015

Hello Everyone,

I'm trying to disable dragging on the Pasteboard. However using
set-dragable to #f also prevents the snip from being selected.

Any ideas on how I would keep a snip selectable but not dragable?

Thanks.

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