tests: update info for mouse move events in device_information

Pick-to: 6.7 6.5
Change-Id: I390aee8c17d971781e7e243cd7bf98e10212f648
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

tests/manual/qtabletevent/device_information/tabletwidget.cpp

@@ -57,6 +57,8 @@ bool TabletWidget::eventFilter(QObject *, QEvent *ev)
             mPos = event->pos();
             mGPos = event->globalPosition();
             mTimestamp = event->timestamp();
+            if (isVisible())
+                update();
         }
         break;
     case QEvent::Wheel: