Tests whether this entirely contains another.
bool containsRectangle(Rectangle<num> another) {
  return left <= another.left &&
      left + width >= another.left + another.width &&
      top <= another.top &&
      top + height >= another.top + another.height;
}
    © 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
    https://api.dart.dev/stable/2.5.0/dart-math/Rectangle/containsRectangle.html