Layer::ParamList param_list(paste_canvas->get_param_list());
//param_list.erase("canvas");
new_layer->set_param_list(param_list);
dynamic_cast<Layer_PasteCanvas*>(new_layer.get())->set_sub_canvas(sub_canvas);
Layer::ParamList param_list(paste_canvas->get_param_list());
//param_list.erase("canvas");
new_layer->set_param_list(param_list);
dynamic_cast<Layer_PasteCanvas*>(new_layer.get())->set_sub_canvas(sub_canvas);