Fixed removing items

src/timeline/component/Group.js

@@ -248,6 +248,14 @@ Group.prototype.remove = function remove(item) {
   // TODO: also remove from ordered items?
 };
 
+/**
+ * Remove an item from the corresponding DataSet
+ * @param {Item} item
+ */
+Group.prototype.removeFromDataSet = function removeFromDataSet(item) {
+  this.itemSet.removeItem(item.id);
+};
+
 /**
  * Order the items
  * @private

src/timeline/component/ItemSet.js

@@ -572,12 +572,7 @@ ItemSet.prototype._onUpdate = function _onUpdate(ids) {
     }
   });
 
-  // reorder the items in all groups
-  // TODO: optimization: only reorder groups affected by the changed items
-  util.forEach(this.groups, function (group) {
-    group._order();
-  });
-
+  this._order();
   this.stackDirty = true; // force re-stacking of all items next repaint
   this.emit('change');
 };
@@ -613,6 +608,18 @@ ItemSet.prototype._onRemove = function _onRemove(ids) {
   }
 };
 
+/**
+ * Update the order of item in all groups
+ * @private
+ */
+ItemSet.prototype._order = function _order() {
+  // reorder the items in all groups
+  // TODO: optimization: only reorder groups affected by the changed items
+  util.forEach(this.groups, function (group) {
+    group._order();
+  });
+};
+
 /**
  * Handle updated groups
  * @param {Number[]} ids

src/timeline/component/item/Item.js

@@ -112,8 +112,7 @@ Item.prototype.repositionY = function repositionY() {
 Item.prototype._repaintDeleteButton = function (anchor) {
   if (this.selected && this.options.editable && !this.dom.deleteButton) {
     // create and show button
-    var parent = this.parent;
-    var id = this.id;
+    var me = this;
 
     var deleteButton = document.createElement('div');
     deleteButton.className = 'delete';
@@ -122,7 +121,7 @@ Item.prototype._repaintDeleteButton = function (anchor) {
     Hammer(deleteButton, {
       preventDefault: true
     }).on('tap', function (event) {
-      parent.removeItem(id);
+      me.parent.removeFromDataSet(me);
       event.stopPropagation();
     });