Charts: QXYSeries::sizeBy method behave incorrectly after points are selected in QScatterSeries.

On calling sizeBy method for a scatter series and then selecting some of the points from the series, size configuration is no longer respected. All the points go back to the markerSize.

Attached sample code to reproduce the above problem. Notice that all points are of same size when point selection is performed after calling sizeBy method.

Remove the code to select points in scatter series and notice that size configuration is now applied to the points as expected.