Bug when image is not accessible on Flutter Web

[wer-mathurin]

Due to CORS issues when running on Flutter Web it may block at some point. This is not a problem in general if you use a cors-proxy. But there is on bug at least in the code:

In the Util.dart

Future<Size> _getImageSize(String url) {
  final stream = Image.network(url).image.resolve(ImageConfiguration.empty);
  final completer = Completer<Size>();

  void onError(Object e, StackTrace? __) {
    print(e);
  }

  void listener(ImageInfo info, bool _) {
    if (!completer.isCompleted) {
      completer.complete(
        Size(
          height: info.image.height.toDouble(),
          width: info.image.width.toDouble(),
        ),
      );
      stream.removeListener(ImageStreamListener(listener, onError: onError));
    }
  }

  stream.addListener(ImageStreamListener(listener, onError: onError));
  return completer.future;
}

The problem is that the completer never complete is it encounter a CORS problem for fetching the image. At least you can change the onError to:

void onError(Object e, StackTrace? s) {
    completer.completeError(e, s);
  }

[demchenkoalex]

Released in v2.2.2. Thanks for the PR!