Update build.

dist/leaflet.markercluster-src.js

@@ -21,9 +21,9 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
 
 		disableClusteringAtZoom: null,
 
-        // Setting this to false prevents the removal of any clusters outside of the viewpoint, which
-        // is the default behaviour for performance reasons.
-        removeOutsideVisibleBounds: true,
+		// Setting this to false prevents the removal of any clusters outside of the viewpoint, which
+		// is the default behaviour for performance reasons.
+		removeOutsideVisibleBounds: true,
 
 		//Whether to animate adding markers after adding the MarkerClusterGroup to the map
 		// If you are adding individual markers set to true, if adding bulk markers leave false for massive performance gains.
@@ -395,6 +395,13 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
 		this._map = null;
 	},
 
+	getVisibleParent: function (marker) {
+		var vMarker = marker;
+		while (vMarker !== null && !vMarker._icon) {
+			vMarker = vMarker.__parent;
+		}
+		return vMarker;
+	},
 
 	//Remove the given object from the given array
 	_arraySplice: function (anArray, obj) {
@@ -704,9 +711,9 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
 
 	//Gets the maps visible bounds expanded in each direction by the size of the screen (so the user cannot see an area we do not cover in one pan)
 	_getExpandedVisibleBounds: function () {
-        if (!this.options.removeOutsideVisibleBounds) {
-            return this.getBounds();
-        }
+		if (!this.options.removeOutsideVisibleBounds) {
+			return this.getBounds();
+		}
 
 		var map = this._map,
 			bounds = map.getBounds(),
@@ -916,6 +923,7 @@ L.markerClusterGroup = function (options) {
 	return new L.MarkerClusterGroup(options);
 };
 
+
 L.MarkerCluster = L.Marker.extend({
 	initialize: function (group, zoom, a, b) {