Adam Barth a98ac70b45 Stacked does not repaint when its position changes
We were marking the parent *Widget's* render object as needing layout, but
we actually need to walk up the component tree until we find the parent
*RenderObjectWrapper* so we can mark actually mark the parent render object as
needing layout.

Fixes #408
2015-07-31 10:06:44 -07:00
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