bugfix

src/mxgraph/shape/mxSwimlane.js

@@ -25,7 +25,7 @@ import mxUtils from '../util/mxUtils';
  */
 class mxSwimlane extends mxShape {
   constructor(bounds, fill, stroke, strokewidth) {
-    super(mxConstants.DO_NOTHING);
+    super();
     this.bounds = bounds;
     this.fill = fill;
     this.stroke = stroke;

src/mxgraph/util/datatypes/mxCellState.ts

@@ -42,7 +42,7 @@ import mxDictionary from "./mxDictionary";
  */
 class mxCellState extends mxRectangle {
   constructor(view: mxGraphView, cell: mxCell, style: {}) {
-    super(mxConstants.DO_NOTHING);
+    super();
 
     this.view = view;
     this.cell = cell;

src/mxgraph/util/mxConstants.js

@@ -7,8 +7,6 @@
 import mxRectangle from './datatypes/mxRectangle';
 
 const mxConstants = {
-  DO_NOTHING: {},
-
   /**
    * Class: mxConstants
    *

src/mxgraph/view/cell/mxCell.ts

@@ -695,7 +695,7 @@ class mxCell {
     if (value != null) {
       if (typeof value.clone === 'function') {
         value = value.clone();
-      } else if (!Number.isNaN(value.nodeType)) {
+      } else if (value.nodeType != null) {
         value = value.cloneNode(true);
       }
     }