finish border paint code

Zhao Yuhang

2023-12-11 2df00b7e7bf5fd9c2f171449f71d1b101480f0db

 examples/shared/widgetframe/windowbar_p.h

@@ -43,6 +43,9 @@
        inline void insertDefaultSpace(int index) {
            layout->insertSpacerItem(index, new QSpacerItem(0, 0));
        }

    private:
        Q_DISABLE_COPY_MOVE(WindowBarPrivate)
    };

}