Merge pull request #25480 from WindyDarian/scene_import_root_type_script_global_class_support

Support script global class (class_name) as root_type when importing a scene

editor/import/resource_importer_scene.cpp

@@ -1291,6 +1291,13 @@ Error ResourceImporterScene::import(const String &p_source_file, const String &p
 	}
 
 	String root_type = p_options["nodes/root_type"];
+	root_type = root_type.split(" ")[0]; // full root_type is "ClassName (filename.gd)" for a script global class.
+
+	Ref<Script> root_script = NULL;
+	if (ScriptServer::is_global_class(root_type)) {
+		root_script = ResourceLoader::load(ScriptServer::get_global_class_path(root_type));
+		root_type = ScriptServer::get_global_class_base(root_type);
+	}
 
 	if (root_type != "Spatial") {
 		Node *base_node = Object::cast_to<Node>(ClassDB::instance(root_type));
@@ -1303,6 +1310,10 @@ Error ResourceImporterScene::import(const String &p_source_file, const String &p
 		}
 	}
 
+	if (root_script.is_valid()) {
+		scene->set_script(Variant(root_script));
+	}
+
 	if (Object::cast_to<Spatial>(scene)) {
 		float root_scale = p_options["nodes/root_scale"];
 		Object::cast_to<Spatial>(scene)->scale(Vector3(root_scale, root_scale, root_scale));