onImplicitWidthChanged signals behaviour changes with print statements.

import QtQuick 1.1

Rectangle {
    id:root
    width: 360; height: 360

    Label{
        id:label
        x:100; y:100
        width: 100
        text: qsTr("Hello World")
        font.pixelSize: 30
    }

    MouseArea {
        anchors.fill: parent
        onPressed: label.width = label.width +2
    }
}

import QtQuick 1.1

Text {
    id: labelTxt
    verticalAlignment: Text.AlignVCenter; horizontalAlignment: Text.AlignHCenter

    onImplicitWidthChanged: {
        console.log("onImplicitWidthChanged");   -- ---- Line 1
        console.log("onImplicitWidthChanged:" + implicitWidth); ----Line 2
    }

    onWidthChanged: {
        console.log("onWidthChanged" + implicitWidth)
    }
}