updateValueAndValidity method
Implementation
void updateValueAndValidity({bool? onlySelf, bool? emitEvent}) {
onlySelf ??= false;
emitEvent ??= true;
onUpdate();
_errors = _runValidator();
_status = _calculateStatus();
if (emitEvent) _emitEvent();
var parent = _parent;
if (parent != null && !onlySelf) {
parent.updateValueAndValidity(onlySelf: onlySelf, emitEvent: emitEvent);
}
}