fix(timeline): #2522 Right button while dragging item makes items uneditable (#2582)

* Fix redraw order
* Fix error when option is not defined
* Allow template labels
* Add .travis.yml file
* Add experiment travis code
* Fix right click button bug when dragging item

lib/timeline/component/ItemSet.js

@@ -256,6 +256,8 @@ ItemSet.prototype._create = function(){
   this.body.dom.centerContainer.addEventListener('mouseover', this._onMouseOver.bind(this));
   this.body.dom.centerContainer.addEventListener('mouseout', this._onMouseOut.bind(this));
   this.body.dom.centerContainer.addEventListener('mousemove', this._onMouseMove.bind(this));
+  // right-click on timeline 
+  this.body.dom.centerContainer.addEventListener('contextmenu', this._onDragEnd.bind(this));
 
   // attach to the DOM
   this.show();
@@ -1590,6 +1592,7 @@ ItemSet.prototype._moveToGroup = function(item, groupId) {
  * @private
  */
 ItemSet.prototype._onDragEnd = function (event) {
+  this.touchParams.itemIsDragging = false;
   if (this.touchParams.itemProps) {
     event.stopPropagation();
 
@@ -1597,7 +1600,6 @@ ItemSet.prototype._onDragEnd = function (event) {
     var dataset = this.itemsData.getDataSet();
     var itemProps = this.touchParams.itemProps ;
     this.touchParams.itemProps = null;
-    this.touchParams.itemIsDragging = false;
 
     itemProps.forEach(function (props) {
       var id = props.item.id;