TextEditor allows the cursor to go off the screen when entering text

import Qt 4.7

Rectangle {
    width: 640; height: 480;
    Rectangle {
        anchors.centerIn: parent
        width: 400
        height: 300;
        color: "blue"

        TextEdit {
            anchors.fill: parent
            font.pixelSize: 30
            color: "white"
            wrapMode: TextEdit.WordWrap
        }
    }
}