refresh method
Implementation
@protected
void refresh() {
assert(_debugAssertNotDisposed());
/// This debounce the call to update.
/// It prevent errors and duplicates builds
// if (_microtask == _version) {
// _microtask++;
// scheduleMicrotask(() {
// _version++;
// _microtask = _version;
_notifyUpdate();
// });
// }
}