TreeList Excel Export exports only the expanded nodes since 2018 R3 (client paging)

[Alex-Bubblemaster]

Bug report

Ticket ID 1363446

Reproduction of the problem

TreeList exports the node with the children 2018 R2 SP1

Dojo

Pageable TreeList exports only the parent node

Dojo

Current behavior

TreeList does not export collapsed nodes

Expected/desired behavior

TreeList should export the collapsed nodes as before

Workaround

Implement a custom toolbar button, expand all nodes, export and then collapse them

 function customExport(){
          var treelist = $("#treelist").data("kendoTreeList");
          treelist.options.dataSource.schema.model.expanded = !treelist.options.dataSource.schema.model.expanded;
          treelist.setDataSource(treelist.options.dataSource);
          treelist.saveAsExcel();
          treelist.options.dataSource.schema.model.expanded = !treelist.options.dataSource.schema.model.expanded;
          treelist.setDataSource(treelist.options.dataSource);   
}

toolbar:[{ name: "customExcel", text: "Excel", imageClass:"k-icon k-i-excel" , click: customExport}]

Alternative Custom function suggested by client

    var treelist = $("#treelist").data("kendoTreeList");
    var dataItemsOriginal = JSON.parse(JSON.stringify(treeList.dataSource.data()));
    var dataItems = treeList.dataSource.data();
    $.each(dataItems, function (i, item) {
       item.expanded = true;
    });
    treeList.dataSource.data(dataItems);
    treeList.saveAsExcel();
    treeList.dataSource.data(dataItemsOriginal);

Additional Information

Possibly related with private issue #9029

Environment

• Kendo UI version: 2018.3.911

[Alex-Bubblemaster]

If the expanded:false setting is not present, not all pages are exported. Reported in ticket 1389408 .
Dojo - https://dojo.telerik.com/upuLEFeW