Fixed losing selection when changing configuration option `type` on the fly

lib/timeline/Timeline.js

@@ -168,8 +168,10 @@ Timeline.prototype.setOptions = function (options) {
       // force recreation of all items
       var itemsData = this.itemsData;
       if (itemsData) {
-        this.setItems(null);      // remove all
-        this.setItems(itemsData); // add all
+        var selection = this.getSelection();
+        this.setItems(null);          // remove all
+        this.setItems(itemsData);     // add all
+        this.setSelection(selection); // restore selection
       }
     }
   }