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6c7fcefe11
Add a AnimatedRelativeRectValue class for animating RelativeRects. Add a PositionedTransition class for animating Positioned using AnimatedRelativeRectValues. Add a test for PositionedTransition. Fix a math bug a RelativeRect found by the test. Fix a logic bug in the two ParentDataWidget classes found by the test. Specifically, they were marking the child dirty, rather than the parent. The parentData is for the parent's layout, not the child's, so they have to mark the parent dirty. (I didn't hoist this up to the superclass because ParentData could be used for painting, hit testing, accessibility, or any number of other things, and I didn't want to bake in the assumption that it needed markNeedsLayout.)
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