QmlDesigner.NodeInstances: Provide bounding rectangle for render image

Change-Id: If1d8e51109eec5e281a1cecdaff7c081a5e6d95d
Reviewed-on: http://codereview.qt.nokia.com/3975Reviewed-by: Thomas Hartmann <Thomas.Hartmann@nokia.com>
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/sgitemnodeinstance.cpp

@@ -198,7 +198,7 @@ QImage SGItemNodeInstance::renderImage() const
 {
     updateDirtyNodeRecursive(sgItem());
 
-    QImage image = designerSupport()->renderImageForItem(sgItem());
+    QImage image = designerSupport()->renderImageForItem(sgItem(), boundingRectWithStepChilds(sgItem()));
 
     image = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);