Add non-system-border option on Windows

Sine Striker

2023-12-22 c837319767bb609c6ec806336e49a347c77b11d3

 examples/shared/widgetframe/windowbar.h

@@ -62,7 +62,7 @@
    protected:
        WindowBar(WindowBarPrivate &d, QWidget *parent = nullptr);

        QScopedPointer<WindowBarPrivate> d_ptr;
        const std::unique_ptr<WindowBarPrivate> d_ptr;
    };

}