Both onMovingHorizontallyChanged and onMovingVerticallyChanged() are received, even if Flickable element is moved only to one direction

import QtQuick 1.0

Flickable {
    width: 500; height: 500
    contentWidth: image.width; contentHeight: image.height

    Image { id: image; source: "image.png" }
    onMovingHorizontallyChanged: console.log("Move Horizontally")
    onMovingVerticallyChanged: console.log("Move Verticatally")
}