onRecvGroupReadReceipt property

SyImGroupReadReceiptCallback? onRecvGroupReadReceipt
getter/setter pair

群已读回执，与 Android onRecvGroupReadReceipt(conversationId)、 iOS onRecvGroupReadReceipt(groupId, msgIds) 对应：被关注的群消息已读人数增加或出现新已读者时回调。 flutter_openim_sdk 3.8.3 没有群回执推送，所以只覆盖 watchGroupReadReceipts 关注的消息。

Implementation

SyImGroupReadReceiptCallback? onRecvGroupReadReceipt;