Missing tooltips in the Extended GMap View

There is no tooltip in the Extended GMap View, when you hold mouse over a marker.
It's like this, because title (tooltip) is directly put into marker array, while it's expected to be in opts sub array.
That line added to template_preprocess_gmap_views_view_gmapextended() in gmap.views.inc, solved the problem for me:
$markers[$offset]['opts'] = array('title' => isset($marker['title']) ? $marker['title'] : NULL);
But I'm not sure if it is the right solution.