src/Helper/Overlays/MarkerCluster/DefaultMarkerClusterHelper.php
public function renderMarkers(MarkerCluster $markerCluster, Map $map)
    {
        $output = array();

        foreach ($markerCluster->getMarkers() as $marker) {
            $output[] = $this->renderMarker($marker, $map);

            if ($marker->hasInfoWindow() && $marker->getInfoWindow()->isAutoOpen()) {
                $this->registerInfoWindowEvent($marker, $map);
            }
        }

        return implode('', $output);
    }
public function renderMarkers(MarkerCluster $markerCluster, Map $map)
    {
        $output = array();

        foreach ($markerCluster->getMarkers() as $marker) {
            $output[] = $this->renderMarker($marker, $map);

            if ($marker->hasInfoWindow() && $marker->getInfoWindow()->isAutoOpen()) {
                $this->registerInfoWindowEvent($marker, $map);
            }
        }

        return implode('', $output);
    }
{@inheritdoc}