re-enable html drawer in drawer comparison demo; deal with merge conflict resolution issues

src/tiledimage.js

@@ -2145,6 +2145,30 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
         return previousBest;
     },
 
+    /**
+     * @private
+     * @inner
+     * Sorts tiles in an array according to distance and visibility.
+     *
+     * @param {OpenSeadragon.Tile[]} tiles The tiles.
+     */
+    _sortTiles: function( tiles ) {
+        tiles.sort(function (a, b) {
+            if (a === null) {
+                return 1;
+            }
+            if (b === null) {
+                return -1;
+            }
+            if (a.visibility === b.visibility) {
+                return (a.squaredDistance - b.squaredDistance);
+            } else {
+                return (a.visibility - b.visibility);
+            }
+        });
+    },
+
+
     /**
      * @private
      * @inner

test/demo/drawercomparison.js

@@ -58,18 +58,18 @@ let viewer2 = window.viewer2 = OpenSeadragon({
 });
 
 // // viewer3: html drawer, unused
-// var viewer3 = window.viewer3 = OpenSeadragon({
-//     id: "htmldrawer",
-//     drawer:'html',
-//     blendTime:2,
-//     prefixUrl: "../../build/openseadragon/images/",
-//     minZoomImageRatio:0.01,
-//     customDrawer: OpenSeadragon.HTMLDrawer,
-//     tileSources: [sources['leaves'], sources['rainbow'], sources['duomo']],
-//     sequenceMode: true,
-//     crossOriginPolicy: 'Anonymous',
-//     ajaxWithCredentials: false
-// });
+var viewer3 = window.viewer3 = OpenSeadragon({
+    id: "htmldrawer",
+    drawer:'html',
+    blendTime:2,
+    prefixUrl: "../../build/openseadragon/images/",
+    minZoomImageRatio:0.01,
+    customDrawer: OpenSeadragon.HTMLDrawer,
+    tileSources: [sources['leaves'], sources['rainbow'], sources['duomo']],
+    sequenceMode: true,
+    crossOriginPolicy: 'Anonymous',
+    ajaxWithCredentials: false
+});
 
 
 // Sync navigation of viewer1 and viewer 2