Updates the dropdowns to reflect the current class and function.

def update_selected(self, linenum):
        """Updates the dropdowns to reflect the current class and function."""
        self.parents = _get_parents(self.funcs, linenum)
        update_selected_cb(self.parents, self.method_cb)

        self.parents = _get_parents(self.classes, linenum)
        update_selected_cb(self.parents, self.class_cb)