use map instead of set

Author: andrewnester

Diff for: lib/ace/search_highlight.js

@@ -56,7 +56,7 @@ var SearchHighlight = function(regExp, clazz, type) {
         if (!this.regExp)
             return;
         var start = config.firstRow, end = config.lastRow;
-        var renderedMarkerRanges = new Set();
+        var renderedMarkerRanges = {};
 
         for (var i = start; i <= end; i++) {
             var ranges = this.cache[i];
@@ -73,9 +73,9 @@ var SearchHighlight = function(regExp, clazz, type) {
             for (var j = ranges.length; j --; ) {
                 var rangeToAddMarkerTo = ranges[j].toScreenRange(session);
                 var rangeAsString = rangeToAddMarkerTo.toString();
-                if (renderedMarkerRanges.has(rangeAsString)) continue;
+                if (renderedMarkerRanges[rangeAsString]) continue;
 
-                renderedMarkerRanges.add(rangeAsString);
+                renderedMarkerRanges[rangeAsString] = true;
                 markerLayer.drawSingleLineMarker(
                     html, rangeToAddMarkerTo, this.clazz, config);
             }