watch method
Starts watching this object for changes (i.e. Listenable.addListener) and rebuilds the widget associated with the provided WatcherRef whenever listeners are notified.
NOTE: This method must only be called from within the build
method of a WatcherWidget, or a Widget that
mixes in WatcherMixin / StatefulWatcherMixin.
Returns the current result (value) of this ResultNotifier.
Implementation
Result<T> watch(WatcherRef ref) {
ref.watch(this);
return value;
}