Regression Qt5 > Qt6: Visible gaps between selected lines

#include <QApplication>
#include <QPlainTextEdit>
#include <QSpinBox>
#include <QVBoxLayout>

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

    QWidget w;
    w.setLayout(new QVBoxLayout());

    QSpinBox sb;
    sb.setRange(1,10000);
    sb.setSuffix("%");
    sb.setSingleStep(10);
    sb.setValue(100);
    w.layout()->addWidget(&sb);


    QPlainTextEdit e;
    QFont font("Source Code Pro");
    constexpr int defaultPointSize = 12;
    font.setPointSize(defaultPointSize);
    e.setFont(font);
    e.setPlainText("foo\nbar\nfoo");
    w.layout()->addWidget(&e);

    QObject::connect(&sb, qOverload<int>(&QSpinBox::valueChanged), [&](int value) {
        font.setPointSize(qMax(1, int(defaultPointSize * value / 100.)));
        e.setFont(font);
        e.selectAll();
    });

    w.show();

    return a.exec();
}