RelativePositionedTransition constructor
Create an animated version of Positioned.
Each frame, the Positioned widget will be configured to represent the
current value of the rect
argument assuming that the stack has the given
size.
Implementation
const RelativePositionedTransition({
super.key,
required Animation<Rect?> rect,
required this.size,
required this.child,
}) : super(listenable: rect);