How can the two be merged?

Our custom painting method for reference:

void TStyle::drawControl(ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const
{
    if (element == QStyle::CE_TabBarTab) {
        QString tabName = mpTabBar->tabData(mpTabBar->tabAt(option->rect.center())).toString();
        QFont font = widget->font();
        bool isStyleChanged = false;
        if (mBoldTabsSet.contains(tabName)||mItalicTabsSet.contains(tabName)||mUnderlineTabsSet.contains(tabName)) {
            painter->save();
            font.setBold(mBoldTabsSet.contains(tabName));
            font.setItalic(mItalicTabsSet.contains(tabName));
            font.setUnderline(mUnderlineTabsSet.contains(tabName));
            isStyleChanged = true;
            painter->setFont(font);
        }

        QProxyStyle::drawControl(element, option, painter, widget);

        if (isStyleChanged) {
            painter->restore();
        }

    } else {
        QProxyStyle::drawControl(element, option, painter, widget);
    }
}