Cannot update size of RectangleComponent after first paint

[lukepighetti]

TLDR: if you create a RectangleComponent, you cannot update it's size after first paint

class OffscreenCharacter extends PositionComponent with HasGameRef<MyGame> {
  OffscreenCharacter();

  /// REPRO: This paints at the correct size on first frame
  late final myRectangleComponent = RectangleComponent(
    anchor: Anchor.center,
    size: camera.gameSize,
    paint: Paint()..color = Colors.red.withOpacity(0.2),
  );

  @override
  Future<void>? onLoad() async {
    await add(myRectangleComponent);
    return super.onLoad();
  }

  late final camera = gameRef.camera;

  @override
  void onGameResize(Vector2 size) {
    super.onGameResize(size);

    /// REPRO: This is not able to update the size
    myRectangleComponent.size.setFrom(gameRef.size);
  }

  @override
  void update(double dt) {
    final cameraCenter = camera.position + camera.gameSize / 2;
    myRectangleComponent.position.setFrom(cameraCenter);
    super.update(dt);
  }
}

Reproduction available here: https://github.com/lukepighetti/plt/tree/lukepighetti/on-game-resize-repro

Discord thread here: https://discord.com/channels/509714518008528896/1044629513000194138

[spydon]

This is solved by #2167