Positioned.fill constructor
const
Positioned.fill({})
Creates a Positioned with all edges set to 0.0 unless specified.
Implementation
const Positioned.fill({
super.key,
this.left = 0.0,
this.top = 0.0,
this.right = 0.0,
this.bottom = 0.0,
this.paintOrder,
required super.child,
}) : width = null,
height = null;