Fixed offset in zooming with scroll when using groups

src/timeline/Range.js

@@ -347,7 +347,7 @@ Range.prototype._onMouseWheel = function(event) {
 
     // calculate center, the date to zoom around
     var gesture = util.fakeGesture(this, event),
-        pointer = getPointer(gesture.center, this.timeline.dom.root),
+        pointer = getPointer(gesture.center, this.timeline.dom.center),
         pointerDate = this._pointerToDate(pointer);
 
     this.zoom(scale, pointerDate);
@@ -396,7 +396,7 @@ Range.prototype._onPinch = function (event) {
 
   if (event.gesture.touches.length > 1) {
     if (!touchParams.center) {
-      touchParams.center = getPointer(event.gesture.center, this.timeline.dom.root);
+      touchParams.center = getPointer(event.gesture.center, this.timeline.dom.center);
     }
 
     var scale = 1 / event.gesture.scale,

src/timeline/component/ItemSet.js

@@ -324,9 +324,9 @@ ItemSet.prototype.repaint = function repaint() {
 
   // reposition axis
   this.dom.axis.style.top = asSize((orientation == 'top') ?
-      this.timeline.props.top.height :
-      this.timeline.props.top.height + this.timeline.props.center.height +
-      this.timeline.props.border.top + this.timeline.props.border.bottom);
+      (this.timeline.props.top.height + this.timeline.props.border.top) :
+      (this.timeline.props.top.height + this.timeline.props.center.height +
+      this.timeline.props.border.top + this.timeline.props.border.bottom));
   this.dom.axis.style.left = this.timeline.props.border.left + 'px';
 
   // check if this component is resized