Remove `isHostSizeFixed` in delegate

Sine Striker

2024-05-09 3fbcf1aa8f91a804af50fad4e2b122f698259c94

 examples/mainwindow/mainwindow.h

@@ -30,6 +30,8 @@
protected:
    bool event(QEvent *event) override;

    void closeEvent(QCloseEvent *event) override;

private:
    void installWindowAgent();
    void loadStyleSheet(Theme theme);