QML behaviour difference testcase

qml59test.qml

import QtQuick 2.2

Item {
  width: 300; height: 300
  property bool arg: false

  Rectangle {
    id: item
    color: 'red'
    width: 100; height: 100

    property int a: arg ? 1 : 0
    property int b: arg ? 0 : 2
    x: 100 * ((a === 0) ? b : (2 - b))
    y: arg ? 100 : 0

    Behavior on x { XAnimator { duration: 300 } }
    Behavior on y { YAnimator { duration: 300 } }
  }
  Timer {
    interval: 500; running: true; repeat: true; triggeredOnStart: true
    onTriggered: arg = !arg
  }
}