QQuickImageProvider can block its separate thread with ForceAsynchronousImageLoading

import QtQuick 2.0
import QtQuick.Controls 1.1

ApplicationWindow {

    width: 100
    height: 100
    visible: true

    Item {
        anchors.fill: parent
        focus: true
        Keys.onPressed: if(event.key === Qt.Key_Escape) Qt.quit()

        Image {
            id: myImage
            anchors {
                left: parent.left
                right: parent.right
                top: parent.top
                bottom: parent.verticalCenter
            }

            source: "image://myImageProvider/image1.png"
            onStatusChanged: console.log("Image Status", status)
        }

        Image {
            id: myImage2
            anchors {
                left: parent.left
                right: parent.right
                top: parent.verticalCenter
                bottom: parent.bottom
            }
            source: "image://myImageProvider/image2.png"
            onStatusChanged: console.log("Image Status", status)
        }
     }
}

MyImageProvider::MyImageProvider()
    : QQuickImageProvider(QQuickImageProvider::Pixmap, QQmlImageProviderBase::ForceAsynchronousImageLoading)
{
}

QPixmap MyImageProvider::requestPixmap(const QString &id, QSize *size, const QSize &requestedSize)
{
    QThread::sleep(2); // force a delay in returning from this function

    QPixmap pixmap;

    pixmap.load(id);
    if (requestedSize.isValid())
        pixmap = pixmap.scaled(requestedSize, Qt::IgnoreAspectRatio);
    *size = pixmap.size();
    return pixmap;
}

QQmlApplicationEngine testContent;
testContent.addImageProvider("myImageProvider", new MyImageProvider);
testContent.load("test.qml");