Initial Linecount in TextArea shows wrong value

    import QtQuick 2.1
    import QtQuick.Controls 1.0
     
    ApplicationWindow {
        width: 480; height : 800
     
        TextArea{
            id: tA1
            anchors{top:parent.top; left:parent.left; right:parent.right; margins: 40}
            text:"This is a Sample Text Area One which contains some Text"
            height: 40 +  lineCount*18  //this could be used to make the textarea grow if the text does
        }
        Label{
            anchors{bottom: parent.bottom;bottomMargin: 40; horizontalCenter: parent.horizontalCenter}
            width: 100; height: 40
            text:"LineCount :: " +tA1.lineCount
        }
    }