menu is closed on any touchstart that is not on the menu

frontend-js/src/main/js/gui/ContextMenu.js

@@ -36,6 +36,7 @@ function ContextMenu(params) {
     }
   };
   $(document).on('click', self._documentClickListener);
+  $(document).on('touchstart', self._documentClickListener);
 }
 
 ContextMenu.prototype = Object.create(AbstractGuiElement.prototype);
@@ -44,6 +45,7 @@ ContextMenu.prototype.constructor = ContextMenu;
 ContextMenu.prototype.destroy = function () {
   var self = this;
   $(document).off('click', self._documentClickListener);
+  $(document).off('touchstart', self._documentClickListener);
 };
 
 ContextMenu.prototype.addOption = function (name, handler, disabled) {