subscribeToMany method
Implementation
void subscribeToMany(List<TFieldProp> sources, T Function() setter, {bool cancelOnUserEdit = false}) {
_valueNotifier ??= ValueNotifier<T>(value);
for (final source in sources) {
final subscriber = _TPropSubscriber(
cancelOnUserEdit: cancelOnUserEdit,
onValueChanged: (value) => _setValue(setter()),
);
source._subscribers[this] = subscriber;
}
}