onMessagePinChanged property
final
      ~english Occurs when the message pin status changes.
This callback is triggered when the message pin status changes. ~end
~chinese 消息置顶状态变化。
当消息置顶状态发生变化时触发此回调。 ~end
Implementation
final void Function(
  String messageId,
  String conversationId,
  MessagePinOperation pinOperation,
  MessagePinInfo pinInfo,
)? onMessagePinChanged;