Prepare to remove style support again

SineStriker

2023-12-22 a5d13e19dd7f6037e10b649c49805922ae5e0fa6

 src/core/contexts/abstractwindowcontext_p.h

@@ -64,7 +64,6 @@
            RaiseWindowHook,
            ShowSystemMenuHook,
            DefaultColorsHook,
            WindowAttributeChangedHook,
            DrawWindows10BorderHook,     // Only works on Windows 10
            SystemButtonAreaChangedHook, // Only works on Mac
        };
@@ -75,6 +74,8 @@

    protected:
        virtual void winIdChanged() = 0;
        virtual bool windowAttributeChanged(const QString &key, const QVariant &attribute,
                                            const QVariant &oldAttribute);

    protected:
        QObject *m_host{};
@@ -90,6 +91,8 @@
        std::array<QObject *, WindowAgentBase::NumSystemButton> m_systemButtons{};

        QVariantHash m_windowAttributes;

        std::unique_ptr<QObject> m_winIdChangeEventFilter;
    };

    inline QObject *AbstractWindowContext::host() const {