copyWith method
Implementation
MessagePosition copyWith({
  int? position,
  int? messageId,
  int? date,
}) => MessagePosition(
  position: position ?? this.position,
  messageId: messageId ?? this.messageId,
  date: date ?? this.date,
);MessagePosition copyWith({
  int? position,
  int? messageId,
  int? date,
}) => MessagePosition(
  position: position ?? this.position,
  messageId: messageId ?? this.messageId,
  date: date ?? this.date,
);