docs: def layerData(self):
          """
          Returns a dictionary of information about this layer that an item \
          can use to sync with.
          
          :return     <dict>
          """
          output = {}
          
          output['visible'] = self.isVisible()
          output['zValue']  = self.zValue()
          output['current'] = self.isCurrent()
          
          return output