Spaces Not Accounted for in QFontMetrics Width Calculation

            QString text = button->text().replace(" ", "_");
            QFont boldArialFont("Arial", 14, QFont::Bold);
            QFontMetrics fm(boldArialFont);
            QRect textRect = fm.boundingRect(0, 0, 0, 0, Qt::TextWordWrap, text);
            int textWidth = textRect.width();

spaces are not counted in the width