docs: def icon(self):
          """
          Gets the icon file name. Read-only.
          """
          if isinstance(self._icon, str):
              if QtGui.QIcon.hasThemeIcon(self._icon):
                  return QtGui.QIcon.fromTheme(self._icon)
              else:
                  return QtGui.QIcon(self._icon)
          elif isinstance(self._icon, tuple):
              return QtGui.QIcon.fromTheme(self._icon[0],
                                           QtGui.QIcon(self._icon[1]))
          elif isinstance(self._icon, QtGui.QIcon):
              return self._icon
          return QtGui.QIcon()