Selecting multiply rows in QListView

I have QListView on the form. Selection mode set to QAbstractItemView::MultiSelection. Signal and Slot connected like this connect(ui->listView->selectionModel(), SIGNAL(currentChanged(QModelIndex,QModelIndex))...

After user selects a row i am looking for another row that must be also selected. It looks like this

void A::selectFieldPairs(const QModelIndex& index)
{
    QItemSelectionModel *selectionModel = ui->listView->selectionModel();
    QItemSelection selection;
    int value = pairs.value(index.row(), -1); //QMap<int, int> pairs
    if (value != -1)
    {
            selection.append(QItemSelectionRange(ui->listView->model()->index(value,0)));
    }

    //selection.append(QItemSelectionRange(index));
    selectionModel->select(selection,
                           QItemSelectionModel::Select |
                           QItemSelectionModel::Clear);

}

It work's if user selecting row using mouse. But if he uses arrows on keyboard index is not selected, but his pair index selected. Can you please Tell me what is the problem?