QQuickAction::iconSource does not support urls (including image:// urls)

void QQuickAction::setIconSource(const QUrl &iconSource)
{
    if (iconSource == m_iconSource)
        return;

    m_iconSource = iconSource;
    if (m_iconName.isEmpty() || m_icon.isNull()) {
        QString fileString = QQmlFile::urlToLocalFileOrQrc(iconSource);
        m_icon = QIcon(fileString);

        emit iconChanged();
    }
    emit iconSourceChanged();
}