1a049c14e5
Add BoxConstraints.isNormalized feature. Use this feature in asserts in all the intrinsic dimension methods, in various relevant BoxConstraints methods, and in layout(). Wrap the _DebugSize logic in BoxConstraints.constrain() in an assert block to avoid a branch in release mode. Remove the logic in BoxConstraints.isSatisfiedBy() that dealt with non-normalized values. Add BoxConstraints.normalize(). Make RenderCustomOneChildLayoutBox.performLayout() only set parentUsesSize on the child if the constraints aren't tight.
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