Enable 'Save All' if there are files to be saved

def refresh_save_all_action(self):
        """Enable 'Save All' if there are files to be saved"""
        editorstack = self.get_current_editorstack()
        if editorstack:
            state = any(finfo.editor.document().isModified() or finfo.newly_created
                        for finfo in editorstack.data)
            self.save_all_action.setEnabled(state)