QTabletEvent TabletMove not sent to a QWidget without any children

For a top level widget without any child widgets, the TabletMove event is not sent. Other events such as TabletPress / TabletRelease are correctly observed. Even if setAttribute(Qt::WA_TabletTracking) is called, it still doesn't work.

In qwidgetwindow.cpp, QWidgetWindow::handleTabletEvent().

void QWidgetWindow::handleTabletEvent(QTabletEvent *event)
{
static QPointer<QWidget> qt_tablet_target = nullptr;

QWidget *widget = qt_tablet_target;

if (!widget) {
widget = m_widget->childAt(event->pos());
if (event->type() == QEvent::TabletPress )

Unknown macro: { if (!widget) widget = m_widget; qt_tablet_target = widget; }

}

Given this code, there's a check to see if widget is null, and if so, it checks to see if there's a widget child at the cursor position. In our case, this is no, since there are no child widgets. The next check is to see then if the event type is a TabletPress, which it is not for a TabletMove. Thus for any hovering events in this widget, they are ignored.

To reproduce the issue, please run the attached example project using a tablet input device.