hasThumbnail method

Implementation

Future<bool> hasThumbnail() async {
  final file = thumbnailFile;
  if (file == null || !await file.exists()) return false;
  final contentType = _thumbnailContentType(file.path);
  if (contentType == null) return false;
  final length = await file.length();
  return length <= kMaxThumbnailSize;
}