[Interest] How can i animate Layout.preferredWidth and friends?

[Mark]

Hi,

I thought something as simple as:

            Behavior on Layout.preferredWidth {
                NumberAnimation { duration: 1000 }
            }

would do.. Apparently not since it crashes qmlscene..
Do i need to do it differently or did i just hit a bug?

Version details:
Qt 5.1.0 x64 (i know, 5.1.1 is out)
Mac Mountain Lion fully updated

Cheers,
Mark
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