Calculating the exact needed height for a QTableWidget

[l3u_]

Hi :-)

I want to calculate the exact height a QTableWidget needs so that no vertical scroll bar is shown. What I do right now is for example:

tableWidget->setMaximumHeight(tableWidget->horizontalHeader()->height()
                              + tableWidget->rowHeight(0) * 4
                              + 4);

for this case, having 4 rows and KDE's Breeze style set, this works exactly:

But the additional 4 pixels seem to be style-dependent, using the Fusion style I get a bit more space than I need (cf. the last row, there are 2 unneeded white pixels):

Is there a way to calculate the exact size independently of the style? I did not find anything fitting yet …

Thanks for all help!