message: DisplayObject#getBounds automatically syncs _lastBoundsID, _boundsID
diff: @@ -260,6 +260,7 @@ export default class DisplayObject extends EventEmitter
  if (this._boundsID !== this._lastBoundsID)
  {
  this.calculateBounds();
  + this._lastBoundsID = this._boundsID;
  }
  if (!rect)
  