tst_QQuickDrawer::Basic::slider fails after making Flickable handle touch events directly

1   QPointingDevicePrivate::setExclusiveGrabber            qpointingdevice.cpp  478  
2   QPointerEvent::setExclusiveGrabber                     qevent.cpp           744  
3   QQuickItem::grabTouchPoints                            qquickitem.cpp       7765 
4   QQuickDrawerPrivate::grabTouch                         qquickdrawer.cpp     419  
5   QQuickDrawer::childMouseEventFilter                    qquickdrawer.cpp     761  
6   QQuickPopupItem::childMouseEventFilter                 qquickpopupitem.cpp  236  
7   QQuickWindowPrivate::sendFilteredPointerEventImpl      qquickwindow.cpp     3239 
8   QQuickWindowPrivate::sendFilteredPointerEventImpl      qquickwindow.cpp     3307 
9   QQuickWindowPrivate::sendFilteredPointerEvent          qquickwindow.cpp     3189 
10  QQuickWindowPrivate::deliverMatchingPointsToItem       qquickwindow.cpp     2927 
11  QQuickWindowPrivate::deliverUpdatedPoints              qquickwindow.cpp     2771 
12  QQuickWindowPrivate::deliverPointerEvent               qquickwindow.cpp     2646 
13  QQuickWindowPrivate::handleTouchEvent                  qquickwindow.cpp     2446 
14  QQuickOverlay::eventFilter                             qquickoverlay.cpp    517  
15  QCoreApplicationPrivate::sendThroughObjectEventFilters qcoreapplication.cpp 1166 
16  QCoreApplicationPrivate::notify_helper                 qcoreapplication.cpp 1195