submitAll() not work for updating fields

[brokensword]

I've discovered that inside calling index() second time:

sqltm->setData(sqltm->index(0,tab_col::Col1),data3);

hasIndex() returns "fail" because second time rowCount() inside hasIndex():

int QSqlTableModel::rowCount(const QModelIndex &parent) const
{
    Q_D(const QSqlTableModel);
 
    if (parent.isValid())
        return 0;
 
    int rc = QSqlQueryModel::rowCount();
    if (d->strategy == OnManualSubmit) {
        for (QSqlTableModelPrivate::CacheMap::ConstIterator it = d->cache.constBegin();
             it != d->cache.constEnd(); ++it) {
             if (it.value().op == QSqlTableModelPrivate::Insert)
                 ++rc;
        }
    } else if (d->insertIndex >= 0) {
        ++rc;
    }
    return rc;
}

int QSqlTableModel::rowCount(const QModelIndex &parent) const
{
    Q_D(const QSqlTableModel);

    if (parent.isValid())
        return 0;

    int rc = QSqlQueryModel::rowCount();
    if (d->strategy == OnManualSubmit) {
        for (QSqlTableModelPrivate::CacheMap::ConstIterator it = d->cache.constBegin();
             it != d->cache.constEnd(); ++it) {
             if (it.value().op == QSqlTableModelPrivate::Insert)
                 ++rc;
        }
    } else if (d->insertIndex >= 0) {
        ++rc;
    }
    return rc;
}

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for (QSqlTableModelPrivate::CacheMap::ConstIterator it = d->cache.constBegin();
it != d->cache.constEnd(); ++it)

didn't increment rc.

So index return correct value just on first call, when there is INSERT row in cache.
Is that a bug?