setExtendable method
Implementation
setExtendable(MP m) async {
/*
if (await NetworkFractal.request(extHash) case NodeFractal ext) {
await ext.ready;
extend = ext;
//m['type'] ??= extend!.type;
}
*/
if (m['extend'] case NodeFractal f) extend = f;
if (extend != null) {
listenExtended();
//extend!.extensions.complete(hash, this);
notifyListeners();
//if (events != null) {
extend!.preload();
}
}