TextEdit: text margin changes are not handled properly

import QtQuick 2.2
import QtQuick.Window 2.2

Window {
    width: 360
    height: 360

    property int styledMargin: 4

    TextEdit {
        anchors.fill: parent
        text: "This is some text"
        textMargin: styledMargin
        property bool test: !text // <==
    }
}