qmlviewer window doesn't resize to root item dimensions that are coming from a networked Image element

Normally qmlviewer resizes the window to the root item dimensions, but that doesn't currently apply when the root item is a networked Image element. According Image element documentation, "If the width and height properties are not specified, the Image element automatically uses the size of the loaded image"

import Qt 4.7
Image {
    source: "http://qt.nokia.com/logo.png"
}