Add has_extension() method to String

modules/gdscript/gdscript_editor.cpp

@@ -1120,7 +1120,7 @@ static void _list_available_types(bool p_inherit_only, GDScriptParser::Completio
 
 	for (const KeyValue<StringName, ProjectSettings::AutoloadInfo> &E : autoloads) {
 		const ProjectSettings::AutoloadInfo &info = E.value;
-		if (!info.is_singleton || info.path.get_extension().to_lower() != "gd") {
+		if (!info.is_singleton || !info.path.has_extension("gd")) {
 			continue;
 		}
 		ScriptLanguage::CodeCompletionOption option(info.name, ScriptLanguage::CODE_COMPLETION_KIND_CLASS, ScriptLanguage::LOCATION_OTHER_USER_CODE);