Adds editor_hint to Engine class

main/main.cpp

@@ -660,6 +660,7 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 	}
 
 	if (editor) {
+		Engine::get_singleton()->set_editor_hint(true);
 		main_args.push_back("-editor");
 		init_maximized = true;
 		use_custom_res = false;