anchor.diff:  }
   
   abstract class OutlinableAction extends Action {
  -  static const LIGHTER_LINE_COLOR = 'rgba(0,0,0,0.3)';
  -  static const DARKER_LINE_COLOR = 'rgba(255,255,255,0.3)';
  +  static const LIGHTER_LINE_COLOR = 'rgba(0,0,0,0.5)';
  +  static const DARKER_LINE_COLOR = 'rgba(255,255,255,0.5)';
   
     static const DASH_INTERVAL = 6;
   
  
positive.code:           ..lineWidth = 1
  
            ..beginPath()
            ..strokeStyle = OutlinableAction.LIGHTER_LINE_COLOR
            ..rect(offset.x, offset.y, size, size)
            ..stroke();
  
  
negative.code: 
  class FloatLayerAction extends OutlinableAction {
    static const FLOAT_PIXEL_SIZE_FACTOR = 0.85;
    static const LIGHTER_LINE_COLOR = 'rgba(0,0,0,0.3)';
    static const DARKER_LINE_COLOR = 'rgba(255,255,255,0.3)';
  
    final PixelCanvasElement canvas;
    final FloatLayer floatLayer;
  