Regression in spinbox PlusMinus symbol rendering

The rendering of the button symbols has regressed after the changes made for QTBUG-112019. The screenshot here:

shows the side-by side comparison between Qt 6.4 and current dev branch. The 6.6 rendering is much worse, with the '+' sign no longer centered and the minus is also worse.

Example to reproduce is:

#include <QtWidgets>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWidget widget;
    QSpinBox plusMinus;
    plusMinus.setButtonSymbols(QAbstractSpinBox::PlusMinus);
    QSpinBox upDown;
    QVBoxLayout vbox;

    vbox.addWidget(&plusMinus);
    vbox.addWidget(&upDown);
    widget.setLayout(&vbox);

    widget.show();
    widget.setWindowTitle(QT_VERSION_STR);
    return app.exec();
}

with the QT_SCALE_FACTOR set to 4 (and since running on macOS, with -style windows command line parameters).

The second screenshot

is with a scale factor of 4.25, and there the new code is an improvement.