`The value of the field '_foo' isn't used. Try removing the field, or using it.` produce invalid code

[stephane-archer]

class _SkimedImage extends StatefulWidget {
  final String _videoPath;
  final double _selectedVideoProgression;
  final void Function(File selectedThumnail)? _onTap;
  final Future<File> _futureThumbnailFile;

  _SkimedImage(this._videoPath, this._selectedVideoProgression,
      {void Function(File)? onTap})
      : _onTap = onTap,
        _futureThumbnailFile =
            getVideoThumnailFile(_videoPath, _selectedVideoProgression);

  @override
  State<_SkimedImage> createState() => _SkimedImageState();
}

The value of the field '_videoPath' isn't used. Try removing the field, or using it.
The value of the field '_selectedVideoProgression' isn't used. Try removing the field, or using it.

Removing _videoPath _selectedVideoProgression will produce invalid code and change the behavior of the program by removing _futureThumbnailFile = getVideoThumnailFile(_videoPath, _selectedVideoProgression);

[stephane-archer]

here is the expected code:

class _SkimedImage extends StatefulWidget {
  final void Function(File selectedThumnail)? _onTap;
  final Future<File> _futureThumbnailFile;

  _SkimedImage(String videoPath, double selectedVideoProgression,
      {void Function(File)? onTap})
      : _onTap = onTap,
        _futureThumbnailFile =
            getVideoThumnailFile(videoPath, selectedVideoProgression);

  @override
  State<_SkimedImage> createState() => _SkimedImageState();
}