did some testing with event filter. not used.

mainwindow.h

@@ -21,6 +21,7 @@ class MainWindow : public QMainWindow {
 
 protected:
     void customEvent(QEvent *event) override;
+    // bool eventFilter(QObject *obj, QEvent *ev) override;
 
 public:
     MainWindow(hwinf *hw, Worker *worker, Update *update, QWidget *parent = nullptr);