anchor.diff:      });
     }
   
  -  void _commit() => _hide();
  -
     Future _showRootDirectory() {
       return spark.localPrefs.getValue('projectFolder').then((folderToken) {
         if (folderToken == null) {
  
positive.code:   }
  
    void _commit() {
      final String name = _nameElement.value;
      if (name.isNotEmpty) {
        folder.createNewFolder(name).then((folder) {
  
negative.code:       _progressDescriptionElement.text = description;
      }
    }
  }
  
  class FileOpenAction extends SparkAction {
  