Synchronize todo results between editorstacks
        Refresh todo list navigation buttons

def todo_results_changed(self):
        """
        Synchronize todo results between editorstacks
        Refresh todo list navigation buttons
        """
        editorstack = self.get_current_editorstack()
        results = editorstack.get_todo_results()
        index = editorstack.get_stack_index()
        if index != -1:
            filename = editorstack.data[index].filename
            for other_editorstack in self.editorstacks:
                if other_editorstack is not editorstack:
                    other_editorstack.set_todo_results(filename, results)
        self.update_todo_actions()