Selection of a panel in a panel misbehaves in the Mac version of Chrome

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Standards mode, GWT 2.5rc1, gwt-dnd 3.1.1

I can successfully drag a panel from a panel on Windows 7 in Chrome, FireFox, 
IE9, Opera, and Safari. But on a Mac in Chrome the outer panel is dragged.

If it would help I can ask my colleague with a Mac to see if this happens in 
the demos at 
http://allen-sauer.com/com.allen_sauer.gwt.dnd.demo.DragDropDemo/DragDropDemo.ht
ml

Original issue reported on code.google.com by [email protected] on 26 Sep 2012 at 3:21