link to _glTrace for hover similar to scattermapbox

Author: archmoj

src/traces/choroplethmapbox/plot.js

@@ -26,6 +26,9 @@ var proto = ChoroplethMapbox.prototype;
 
 proto.update = function(calcTrace) {
     this._update(convert(calcTrace));
+
+    // link ref for quick update during selections
+    calcTrace[0].trace._glTrace = this;
 };
 
 proto.updateOnSelect = function(calcTrace) {

src/traces/scattermapbox/plot.js

@@ -130,7 +130,7 @@ proto.update = function update(calcTrace) {
         this.clusterEnabled = hasCluster;
     }
 
-  // link ref for quick update during selections
+    // link ref for quick update during selections
     calcTrace[0].trace._glTrace = this;
 };