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Update friend information

Update friend remarks, pin state, or extension data with the OpenIM Flutter SDK.

Copy
await OpenIM.iMManager.friendshipManager.updateFriends(
  UpdateFriendsReq(
    friendUserIDs: [friendUserID],
    remark: remark.trim(),
  ),
);

One call applies the same field value to every target friend. ex is a complete string value; make separate calls when different friends need different values. Handle successful completion of the Future and onFriendInfoChanged as separate stages.