anchor.diff:        {Map<String, String> headers,
         Key key,
         bool clipToViewBox = true,
  -      PaintLocation paintLocation = PaintLocation.Foreground}) {
  +      PaintLocation paintLocation = PaintLocation.Background}) {
       return new SvgImage._(
         loadNetworkAsset2(uri),
         size,
  
positive.code:       AssetBundle bundle,
        String package,
        bool clipToViewBox = true,
        PaintLocation paintLocation = PaintLocation.Foreground}) {
      return new SvgImage._(
        loadAsset(assetName, bundle, package),
        size,
  
negative.code:   const SvgImage._(this.future, this.size,
        {this.clipToViewBox = true,
        Key key,
        this.paintLocation = PaintLocation.Background})
        : super(key: key);
  
    factory SvgImage.asset(String assetName, Size size,
  