showFileExtension is not working as expect

[zhuyijing]

Describe the bug

  static String basename(dynamic entity, [bool showFileExtension = true]) {
    if (entity is Directory) {
      return entity.path.split('/').last;
    } else if (entity is File) {
      return (showFileExtension)   ====> should be (!showFileExtension)
          ? entity.path.split('/').last.split('.').first
          : entity.path.split('/').last;
    } else {
      print(
          "Please provide a Object of type File, Directory or FileSystemEntity");
      return "";
    }
  }

To Reproduce
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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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