Set the width and height for one cell in the tooltip

        This is inderectly acomplished by setting the iconsizes for the buttons.

        :param width: the width of one cell, min. is 7 -> icon width = 0
        :type width: int
        :param height: the height of one cell, min. is 6 -> icon height = 0
        :type height: int
        :returns: None
        :rtype: None
        :raises: None

def setup_size(self, width, height):
        """Set the width and height for one cell in the tooltip

        This is inderectly acomplished by setting the iconsizes for the buttons.

        :param width: the width of one cell, min. is 7 -> icon width = 0
        :type width: int
        :param height: the height of one cell, min. is 6 -> icon height = 0
        :type height: int
        :returns: None
        :rtype: None
        :raises: None
        """
        self._iconw = max(0, width - 7)
        self._iconh = max(0, height - 6)
        self.update_all_buttons()