[Interest] copying the object in the delegate

[Stan Morris]

The row index changes few times in comparison to the number of times data
is called. Reduce the number of times your code instances a new object by
caching the object and creating a new one only when the row index changes.

Something like:

    QVariant data(const QModelIndex &index, int role) override
    {
        static int lastRow = -1;
        static QScopedPoint<MyDataClass> lastObj;
        if (lastObj.isNull() || index.row() != lastRow) {
            lastRow = index.row();
            lastObj.reset(createDataForRow(lastRow);
        }

/Stan
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