port some more code (for os < win10)

Yuhang Zhao

2023-12-05 9b1599d82e86d2d0463b60fe6fa61f94be50f983

 examples/shared/widgetframe/windowbar.cpp

@@ -18,7 +18,7 @@
    void WindowBarPrivate::init() {
        Q_Q(WindowBar);
        layout = new QHBoxLayout();
        layout->setMargin(0);
        layout->setContentsMargins(QMargins());
        layout->setSpacing(0);
        for (int i = IconButton; i <= CloseButton; ++i) {
            insertDefaultSpace(i);