Issue setting the source of a QQuickWidget (created in a plugin) to a qml resource file

// no qml displayed
// error written in console:
// "file:///path/to/QMLfromPlugin/: file to open is a directory"
widget->setSource(QUrl(":/qml/MyQmlFile.qml"));

// works just fine
widget->setSource(QUrl(QDir(QCoreApplication::applicationDirPath()).path() + "/qmlplugin/qml/MyQmlFile.qml"));

// works just fine as well
QString qrcPath(":/qml/MyQmlFile.qml");
QFile file(qrcPath);
qDebug() << qrcPath << "open" << file.open(QIODevice::ReadOnly);
qDebug() << qrcPath << "error" << file.errorString();