Problem: On Macintosh the anchor docking system doesn't provide a preview window, making arranging docked layouts on OSX cumbersome to say the least. I think this issue is going to become more important as work progresses on anchor docking and the sparta docked form designer.

Video detailing my solution:

http://cache.getlazarus.org/videos/docking-preview.mp4

I put this solution video form because I think a good chunk of code can be removed from the LCL. Using a tiny bit piece of universal code rather than many larger different implementations for each widgetset seem desirable to me. But, the Controls and Forms units need a minor alteration, which might possibly be something some or the key Lazarus developers resist. Maybe the my stub procedure could be better placed/organized. You decide.

The issue with patch has been filed here:

http://mantis.freepascal.org/view.php?id=29426
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