Implement mainwindow example

Sine Striker

2023-12-05 f8975a7d449bac21a2fdbc1a8ca85d1f5b99b362

 src/core/contexts/abstractwindowcontext_p.h

@@ -16,9 +16,7 @@
    class QWK_CORE_EXPORT AbstractWindowContext : public QObject {
        Q_OBJECT
    public:
        inline AbstractWindowContext(QWindow *window, WindowItemDelegate *delegate)
            : m_windowHandle(window), m_delegate(delegate) {
        }
        AbstractWindowContext(QWindow *window, WindowItemDelegate *delegate);
        ~AbstractWindowContext() override;

    public: