chat_management_cubit5.dart

  void selectUserToSendCapturedPhoto({
    required User user,
    required int userIndex,
  }) {
    final listOfSelectedUserIDs = {...state.listOfSelectedUserIDs};

    if (listOfSelectedUserIDs.isEmpty) {
      listOfSelectedUserIDs.add(user.id);
    }

    emit(
      state.copyWith(listOfSelectedUserIDs: listOfSelectedUserIDs, userIndex: userIndex),
    );
  }

  void removeUserToSendCapturedPhoto({
    required User user,
  }) {
    final listOfSelectedUserIDs = {...state.listOfSelectedUserIDs};

    listOfSelectedUserIDs.remove(user.id);

    emit(
      state.copyWith(listOfSelectedUserIDs: listOfSelectedUserIDs, userIndex: 0),
    );
  }