As promised here is my API proposal for a plug-in preview widget.
You can find it at http://refocus.sourceforge.net/preview.
Please examine it critically, this should be a preview that
should be usable for a very wide range of plug-ins.
Because I would like to reuse this proposal (or what is left of it
after the discussion) for the final documentation I
also welcome minor comments such as spelling mistakes, grammar
corrections, coding errors and such.
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