Call event.stopPropagation() before adding or removing items (see #577)

lib/timeline/component/ItemSet.js

@@ -1419,9 +1419,11 @@ ItemSet.prototype._onAddItem = function (event) {
   if (!this.options.selectable) return;
   if (!this.options.editable.add) return;
 
-  var me = this,
-      snap = this.options.snap || null,
-      item = this.itemFromTarget(event);
+  var me = this;
+  var snap = this.options.snap || null;
+  var item = this.itemFromTarget(event);
+
+  event.stopPropagation();
 
   if (item) {
     // update item

lib/timeline/component/item/Item.js

@@ -144,8 +144,8 @@ Item.prototype._repaintDeleteButton = function (anchor) {
 
     // TODO: be able to destroy the delete button
     new Hammer(deleteButton).on('tap', function (event) {
-      me.parent.removeFromDataSet(me);
       event.stopPropagation();
+      me.parent.removeFromDataSet(me);
     });
 
     anchor.appendChild(deleteButton);