build method
Returns the child and sets the correct context in MBmessages.
Implementation
@override
Widget build(BuildContext context) {
  MBMessages.contextCallback = () => context;
  return child;
}Returns the child and sets the correct context in MBmessages.
@override
Widget build(BuildContext context) {
  MBMessages.contextCallback = () => context;
  return child;
}