Add private warnings and change pictures

Sine Striker

2023-12-19 2ccafcb1d891ed0fff4cc85729ca1faf5b7f1c96

 examples/mainwindow/mainwindow.cpp

@@ -42,7 +42,6 @@
    }

    setWindowTitle(tr("Example MainWindow"));
    resize(800, 600);
}

static inline void emulateLeaveEvent(QWidget *widget) {