anchor.diff:  
       return itemId;
     }
  +
     @override
     Future<String> delete(String id) async {
       await _extensionServices.sendDeletingItem(id);
  
positive.code:     } catch (e, st) {
        _log.severe(e, st);
        for (FileSystemEntity fse in filesWritten) {
          if(fse==null)
            continue;
  
          try {
            final bool exists = await fse.exists();
  
negative.code:       try {
          final double durationDouble = double.parse(durationString);
          item.duration = (durationDouble * 1000).floor();
        } on FormatException catch (e, st) {
          item.errors.add("Could not interpret item duration: $durationString");
          _log.warning(
              "Could not interpret item duration: $durationString", e, st);
        }
      }
      result = await Process.run("ffprobe",
  