fix(links): clear Cells and Links arrays when polydata is cleared

BuildLinks enforces building cells only if they do not exist. When clearing the polydata, cells and
links must be cleared accordingly. Same when verts, lines, polys and strips arrays are changed

fix #3361

Author: finetjul

Sources/Common/DataModel/PolyData/index.js

@@ -39,6 +39,11 @@ function vtkPolyData(publicAPI, model) {
       .replace(/\s+/g, '');
   }
 
+  function clearCells() {
+    model.cells = undefined;
+    model.links = undefined;
+  }
+
   // build empty cell arrays and set methods
   POLYDATA_FIELDS.forEach((type) => {
     publicAPI[`getNumberOf${camelize(type)}`] = () =>
@@ -48,6 +53,7 @@ function vtkPolyData(publicAPI, model) {
     } else {
       model[type] = vtk(model[type]);
     }
+    model[`_on${camelize(type)}Changed`] = clearCells;
   });
 
   publicAPI.getNumberOfCells = () =>
@@ -75,6 +81,7 @@ function vtkPolyData(publicAPI, model) {
   const superInitialize = publicAPI.initialize;
   publicAPI.initialize = () => {
     POLYDATA_FIELDS.forEach((type) => model[type]?.initialize());
+    clearCells();
     return superInitialize();
   };
 
@@ -180,7 +187,7 @@ function vtkPolyData(publicAPI, model) {
    * topologically complex queries.
    */
   publicAPI.buildLinks = (initialSize = 0) => {
-    if (model.cells === undefined) {
+    if (model.cells == null) {
       publicAPI.buildCells();
     }