enhanced tree collapse/expand to avoid flood slide animation on multiple clicks on one item

build/js/Treeview.js

@@ -69,7 +69,7 @@ const Treeview = (($) => {
         this.collapse(openTreeview, openMenuLi)
       }
 
-      treeviewMenu.slideDown(this._config.animationSpeed, () => {
+      treeviewMenu.stop().slideDown(this._config.animationSpeed, () => {
         parentLi.addClass(ClassName.OPEN)
         $(this._element).trigger(expandedEvent)
       })
@@ -78,7 +78,7 @@ const Treeview = (($) => {
     collapse(treeviewMenu, parentLi) {
       const collapsedEvent = $.Event(Event.COLLAPSED)
 
-      treeviewMenu.slideUp(this._config.animationSpeed, () => {
+      treeviewMenu.stop().slideUp(this._config.animationSpeed, () => {
         parentLi.removeClass(ClassName.OPEN)
         $(this._element).trigger(collapsedEvent)
         treeviewMenu.find(`${Selector.OPEN} > ${Selector.TREEVIEW_MENU}`).slideUp()