Avoid data loss when dragging an unsaved Nested Content item (#3014)

src/Umbraco.Web.UI.Client/src/views/propertyeditors/nestedcontent/nestedcontent.controller.js

@@ -231,6 +231,7 @@ angular.module("umbraco").controller("Umbraco.PropertyEditors.NestedContent.Prop
             cursor: "move",
             handle: ".umb-nested-content__icon--move",
             start: function (ev, ui) {
+                updateModel();
                 // Yea, yea, we shouldn't modify the dom, sue me
                 $("#umb-nested-content--" + $scope.model.id + " .umb-rte textarea").each(function () {
                     tinymce.execCommand('mceRemoveEditor', false, $(this).attr('id'));