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/scene/scene_string_names.cpp b/scene/scene_string_names.cpp
index 140e588291..31daeb3ae3 100644
--- a/scene/scene_string_names.cpp
+++ b/scene/scene_string_names.cpp
@@ -130,6 +130,8 @@ SceneStringNames::SceneStringNames() {
 	shader_overrides_group = StaticCString::create("_shader_overrides_group_");
 	shader_overrides_group_active = StaticCString::create("_shader_overrides_group_active_");
 
+	_custom_type_script = StaticCString::create("_custom_type_script");
+
 	pressed = StaticCString::create("pressed");
 	id_pressed = StaticCString::create("id_pressed");
 	toggled = StaticCString::create("toggled");