QT添加全局手势的界面双指触摸出现打印TouchPointPressed without previous release event

[「已注销」]

问题描述：
1 在有全局手势的界面双指触摸出现打印信息TouchPointPressed without previous release event
2 在有全局手势的界面单指触摸正常
3 在没有全局手势的界面单双指触摸正常

请问是什么原因导致出现这个打印信息，应该如何避免呢？

出现打印信息的函数：

QQuickPointerEvent *QQuickPointerTouchEvent::reset(QEvent *event)
{
    auto ev = static_cast<QTouchEvent*>(event);
    m_event = ev;
    if (!event)
        return this;

    m_device = QQuickPointerDevice::touchDevice(ev->device());
    m_button = Qt::NoButton;
    m_pressedButtons = Qt::NoButton;

    const QList<QTouchEvent::TouchPoint> &tps = ev->touchPoints();
    int newPointCount = tps.count();
    m_touchPoints.reserve(newPointCount);

    for (int i = m_touchPoints.size(); i < newPointCount; ++i)
        m_touchPoints.insert(i, new QQuickEventTouchPoint(this));

    // Make sure the grabbers are right from one event to the next
    QVector<QQuickItem*> grabbers;
    // Copy all grabbers, because the order of points might have changed in the event.
    // The ID is all that we can rely on (release might remove the first point etc).
    for (int i = 0; i < newPointCount; ++i) {
        QQuickItem *grabber = nullptr;
        if (auto point = pointById(tps.at(i).id()))
            grabber = point->grabber();
        grabbers.append(grabber);
    }

    bool b = false;
    for (int i = 0; i < newPointCount; ++i) {
        auto point = m_touchPoints.at(i);
        point->reset(tps.at(i), ev->timestamp());
        if (point->state() == QQuickEventPoint::Pressed) {
            if (grabbers.at(i))
            {
                qWarning() << "TouchPointPressed without previous release event" << point;
                b = true;
            }
            point->setGrabber(nullptr);
        } else {
            point->setGrabber(grabbers.at(i));
        }
    }
    m_pointCount = newPointCount;
    if (b)
    {
        qWarning() << "Re-Send the release event!!";

        emit qGuiApp->applicationStateChanged(Qt::ApplicationInactive);
        emit qGuiApp->applicationStateChanged(Qt::ApplicationActive);
    }
    return this;
}