fix tab arrow issue
@ -2544,6 +2544,10 @@ DefaultViewPort::DefaultViewPort(CvWindow* arg, int arg2) : QGraphicsView(arg),
setInteractive(false);
setMouseTracking(true); //receive mouse event everytime
// #13657 Tab key disables arrow keys
// #20215 QT backend: cv::waitKey() and cv::waitKeyEx() do not capture arrow keys once you click on the image or press TAB
setFocusPolicy(Qt::NoFocus);
}