operators.py

            def save_visibility_state(layer_collection):
                phantom_history["initial_state"][layer_collection.name] = {
                            "exclude": layer_collection.exclude,
                            "select": layer_collection.collection.hide_select,
                            "hide": layer_collection.hide_viewport,
                            "disable": layer_collection.collection.hide_viewport,
                            "render": layer_collection.collection.hide_render,
                                }

            apply_to_children(view_layer.layer_collection, save_visibility_state)

            # save current rto history
            for rto, history, in rto_history.items():
                if history.get(view_layer.name, None):
                    phantom_history[rto+"_history"] = deepcopy(history[view_layer.name])



        else: # return to normal mode
            def restore_visibility_state(layer_collection):
                phantom_laycol = phantom_history["initial_state"][layer_collection.name]

                layer_collection.exclude = phantom_laycol["exclude"]
                layer_collection.collection.hide_select = phantom_laycol["select"]
                layer_collection.hide_viewport = phantom_laycol["hide"]
                layer_collection.collection.hide_viewport = phantom_laycol["disable"]
                layer_collection.collection.hide_render = phantom_laycol["render"]

            apply_to_children(view_layer.layer_collection, restore_visibility_state)


            # restore previous rto history
            for rto, history, in rto_history.items():
                if view_layer.name in history:
                    del history[view_layer.name]

                if phantom_history[rto+"_history"]:
                    history[view_layer.name] = deepcopy(phantom_history[rto+"_history"])

                phantom_history[rto+"_history"].clear()

            cm.in_phantom_mode = False


        return {'FINISHED'}