Fixed #102: offset in newly created items when using groups.

HISTORY.md

@@ -16,6 +16,7 @@ http://visjs.org
   Timeline, deselecting selected items).
 - Fixed initial visible window in case items exceed `zoomMax`. Thanks @Remper.
 - Option `order` is now deprecated. This was needed for performance improvements.
+- Fixed an offset in newly created items when using groups.
 - Minor bug fixes.
 - More examples added.
 

src/timeline/Timeline.js

@@ -639,7 +639,7 @@ Timeline.prototype._onAddItem = function (event) {
   }
   else {
     // add item
-    var xAbs = vis.util.getAbsoluteLeft(this.rootPanel.frame);
+    var xAbs = vis.util.getAbsoluteLeft(this.contentPanel.frame);
     var x = event.gesture.center.pageX - xAbs;
     var newItem = {
       start: this.timeAxis.snap(this._toTime(x)),