maxRectangle property
The minimum 2d size of any children.
For example, if you have a list of 2 items, Item1 with size {x = 10, y = 20}, Item2 with size {x = 20, y = 10}
The max rectangle is the largest value for both x and y of any child combined, which is Rect(20, 20).
Implementation
final Size maxRectangle;