#include <QApplication>
#include <QWidget>
#include <QGridLayout>
#include <QStaticText>
#include <QPainter>

class Widget : public QWidget
{
public:
    Widget(QFont font, qreal scale, QWidget *parent = nullptr)
        : QWidget(parent)
        , font(font)
        , scale(scale)
    {
    }

protected:
    void paintEvent(QPaintEvent */*event*/) override
    {
        QPainter painter(this);
        painter.drawRect(rect().adjusted(0, 0, -1, -1));
        painter.translate(100, height() / 2);
        painter.scale(scale, scale);
        painter.setFont(font);
        QStaticText staticText(QString{"%1% Text"}.arg(scale * 100));
        // staticText.prepare({}, font); // Not affecting the bug
        painter.drawStaticText(0, 0, staticText);
    }

private:
    QFont font;
    qreal scale;
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    auto *r = new QWidget;
    auto *l = new QGridLayout(r);
    QFont font{"Courier New", 36};
    font.setStrikeOut(true);
    font.setUnderline(true);
    const int row = 3;
    const int col = 2;
    for (int i = 0; i < row * col; ++i) {
        auto w = new Widget(font, 0.25 * (i + 1));
        l->addWidget(w, i % row, i / row);
    }
    r->setGeometry(0, 0, 800, 640);
    r->show();
    return a.exec();
}