Enforce that custom nodes keep their original type

Enforce that custom nodes and resources created via the "Create New Node" dialog, should permanently retain their original type (script). This means:

- Type continuity: It should be impossible for the user to (accidentally) clear the original script of a custom node that was created via the "Create New Node" dialog.

- Extensibility: The user should be able to extend custom types as usual (create a script that inherits the original type and replace the original script of that node with his own). However, if he then clears his extension-script from that node later on, the custom type should revert to its original script instead of becoming a non-scripted type.

1 files changed, 2 insertions, 0 deletions

diff --git a/editor/editor_data.cpp b/editor/editor_data.cpp
index ee16c61c89..bb02172b1a 100644
--- a/editor/editor_data.cpp
+++ b/editor/editor_data.cpp
@@ -547,6 +547,7 @@ Variant EditorData::instantiate_custom_type(const String &p_type, const String &
 				if (n) {
 					n->set_name(p_type);
 				}
+				n->set_meta(SceneStringName(_custom_type_script), script);
 				((Object *)ob)->set_script(script);
 				return ob;
 			}
@@ -1008,6 +1009,7 @@ Variant EditorData::script_class_instance(const String &p_class) {
 			// Store in a variant to initialize the refcount if needed.
 			Variant obj = ClassDB::instantiate(script->get_instance_base_type());
 			if (obj) {
+				Object::cast_to<Object>(obj)->set_meta(SceneStringName(_custom_type_script), script);
 				obj.operator Object *()->set_script(script);
 			}
 			return obj;