pub fn layout_positioned_child(
app: &mut App,
child: AnyRenderBox,
size: Size,
alignment: Alignment,
) -> boolExpand description
Lays out the positioned child according to alignment within a stack of size.
Returns true when the child has visual overflow. Flutter’s RenderStack.layoutPositionedChild;
it also takes the child’s StackParentData, which is read from the child here.