Merge pull request #29308 from hbina/fixing_undo_2d_particles

added ability to undo conversion of Particles2D to CPUParticles2D

editor/plugins/particles_2d_editor_plugin.cpp

@@ -93,7 +93,13 @@ void Particles2DEditorPlugin::_menu_callback(int p_idx) {
 			cpu_particles->set_pause_mode(particles->get_pause_mode());
 			cpu_particles->set_z_index(particles->get_z_index());
 
-			EditorNode::get_singleton()->get_scene_tree_dock()->replace_node(particles, cpu_particles, false);
+			UndoRedo *ur = EditorNode::get_singleton()->get_undo_redo();
+			ur->create_action(TTR("Convert from Particles2D"));
+			ur->add_do_method(EditorNode::get_singleton()->get_scene_tree_dock(), "replace_node", particles, cpu_particles, true, false);
+			ur->add_do_reference(particles);
+			ur->add_undo_method(EditorNode::get_singleton()->get_scene_tree_dock(), "replace_node", cpu_particles, particles, false, false);
+			ur->add_undo_reference(this);
+			ur->commit_action();
 
 		} break;
 	}