isPositioned property
Whether this child is considered positioned.
A child is positioned if any of the top, right, bottom, or left properties are non-null. Positioned children do not factor into determining the size of the stack but are instead placed relative to the non-positioned children in the stack.
Implementation
bool get isPositioned =>
top != null ||
right != null ||
bottom != null ||
left != null ||
width != null ||
height != null;