add quick isfixedsize

Zhao Yuhang

2023-12-20 74091e049e3975ac1b3c36768c5820f5604354dd

 src/core/windowitemdelegate.cpp

@@ -6,6 +6,8 @@

    WindowItemDelegate::~WindowItemDelegate() = default;

    void WindowItemDelegate::resetQtGrabbedControl() const {}
    void WindowItemDelegate::resetQtGrabbedControl(QObject *host) const {
        Q_UNUSED(host);
    }

}