Make hit-test items auto-delete

Sine Striker

2024-07-28 e9d163b1a811ee4f02e898bc7c2e6336d88e4a7f

 examples/mainwindow/mainwindow.cpp

@@ -60,8 +60,7 @@
    setWindowTitle(tr("Example MainWindow"));
    resize(800, 600);

    setFixedHeight(600);

    // setFixedHeight(600);
    // windowAgent->centralize();
}