Fix loss of gdextension on editor startup

core/io/resource_format_binary.cpp

@@ -1268,6 +1268,11 @@ void ResourceFormatLoaderBinary::get_recognized_extensions_for_type(const String
 		return;
 	}
 
+	// res files not supported for GDExtension.
+	if (p_type == "GDExtension") {
+		return;
+	}
+
 	List<String> extensions;
 	ClassDB::get_extensions_for_type(p_type, &extensions);
 

editor/editor_file_system.cpp

@@ -248,11 +248,16 @@ void EditorFileSystem::_first_scan_filesystem() {
 	ep.step(TTR("Scanning file structure..."), 0, true);
 	nb_files_total = _scan_new_dir(first_scan_root_dir, d);
 
+	// Preloading GDExtensions file extensions to prevent looping on all the resource loaders
+	// for each files in _first_scan_process_scripts.
+	List<String> gdextension_extensions;
+	ResourceLoader::get_recognized_extensions_for_type("GDExtension", &gdextension_extensions);
+
 	// This loads the global class names from the scripts and ensures that even if the
 	// global_script_class_cache.cfg was missing or invalid, the global class names are valid in ScriptServer.
 	// At the same time, to prevent looping multiple times in all files, it looks for extensions.
 	ep.step(TTR("Loading global class names..."), 1, true);
-	_first_scan_process_scripts(first_scan_root_dir, existing_class_names, extensions);
+	_first_scan_process_scripts(first_scan_root_dir, gdextension_extensions, existing_class_names, extensions);
 
 	// Removing invalid global class to prevent having invalid paths in ScriptServer.
 	_remove_invalid_global_class_names(existing_class_names);
@@ -276,41 +281,46 @@ void EditorFileSystem::_first_scan_filesystem() {
 	ep.step(TTR("Starting file scan..."), 5, true);
 }
 
-void EditorFileSystem::_first_scan_process_scripts(const ScannedDirectory *p_scan_dir, HashSet<String> &p_existing_class_names, HashSet<String> &p_extensions) {
+void EditorFileSystem::_first_scan_process_scripts(const ScannedDirectory *p_scan_dir, List<String> &p_gdextension_extensions, HashSet<String> &p_existing_class_names, HashSet<String> &p_extensions) {
 	for (ScannedDirectory *scan_sub_dir : p_scan_dir->subdirs) {
-		_first_scan_process_scripts(scan_sub_dir, p_existing_class_names, p_extensions);
+		_first_scan_process_scripts(scan_sub_dir, p_gdextension_extensions, p_existing_class_names, p_extensions);
 	}
 
 	for (const String &scan_file : p_scan_dir->files) {
 		// Optimization to skip the ResourceLoader::get_resource_type for files
 		// that are not scripts. Some loader get_resource_type methods read the file
 		// which can be very slow on large projects.
-		String ext = scan_file.get_extension().to_lower();
+		const String ext = scan_file.get_extension().to_lower();
 		bool is_script = false;
 		for (int i = 0; i < ScriptServer::get_language_count(); i++) {
 			if (ScriptServer::get_language(i)->get_extension() == ext) {
 				is_script = true;
 				break;
 			}
 		}
-		if (!is_script) {
-			continue; // Not a script.
-		}
+		if (is_script) {
+			const String path = p_scan_dir->full_path.path_join(scan_file);
+			const String type = ResourceLoader::get_resource_type(path);
 
-		String path = p_scan_dir->full_path.path_join(scan_file);
-		String type = ResourceLoader::get_resource_type(path);
+			if (ClassDB::is_parent_class(type, SNAME("Script"))) {
+				String script_class_extends;
+				String script_class_icon_path;
+				String script_class_name = _get_global_script_class(type, path, &script_class_extends, &script_class_icon_path);
+				_register_global_class_script(path, path, type, script_class_name, script_class_extends, script_class_icon_path);
 
-		if (ClassDB::is_parent_class(type, SNAME("Script"))) {
-			String script_class_extends;
-			String script_class_icon_path;
-			String script_class_name = _get_global_script_class(type, path, &script_class_extends, &script_class_icon_path);
-			_register_global_class_script(path, path, type, script_class_name, script_class_extends, script_class_icon_path);
+				if (!script_class_name.is_empty()) {
+					p_existing_class_names.insert(script_class_name);
+				}
+			}
+		}
 
-			if (!script_class_name.is_empty()) {
-				p_existing_class_names.insert(script_class_name);
+		// Check for GDExtensions.
+		if (p_gdextension_extensions.find(ext)) {
+			const String path = p_scan_dir->full_path.path_join(scan_file);
+			const String type = ResourceLoader::get_resource_type(path);
+			if (type == SNAME("GDExtension")) {
+				p_extensions.insert(path);
 			}
-		} else if (type == SNAME("GDExtension")) {
-			p_extensions.insert(path);
 		}
 	}
 }

editor/editor_file_system.h

@@ -191,7 +191,7 @@ class EditorFileSystem : public Node {
 
 	void _scan_filesystem();
 	void _first_scan_filesystem();
-	void _first_scan_process_scripts(const ScannedDirectory *p_scan_dir, HashSet<String> &p_existing_class_names, HashSet<String> &p_extensions);
+	void _first_scan_process_scripts(const ScannedDirectory *p_scan_dir, List<String> &p_gdextension_extensions, HashSet<String> &p_existing_class_names, HashSet<String> &p_extensions);
 
 	HashSet<String> late_update_files;
 

scene/resources/resource_format_text.cpp

@@ -1431,8 +1431,8 @@ void ResourceFormatLoaderText::get_recognized_extensions_for_type(const String &
 		p_extensions->push_back("tscn");
 	}
 
-	// Don't allow .tres for PackedScenes.
-	if (p_type != "PackedScene") {
+	// Don't allow .tres for PackedScenes or GDExtension.
+	if (p_type != "PackedScene" && p_type != "GDExtension") {
 		p_extensions->push_back("tres");
 	}
 }