WIP: prepare border painter

Yuhang Zhao

2023-12-11 5c471560256776f17f1e3d5c377c7d3e9fdcc0f1

 src/core/contexts/win32windowcontext_p.h

@@ -21,6 +21,9 @@
            TitleBar,
        };

        QString key() const override;
        void virtual_hook(int id, void *data) override;

    protected:
        bool setupHost() override;