If one column is not sortable between other sortable columns, wrong column is processed server side

[anna-git]

               <tr>
                                <th data-name="c1">@Localizer["Column1"]</th>
                                <th data-name="c2" data-orderable='false'>@Localizer["Column2"]</th>
                                <th data-name="c3" class="">@Localizer["Column3"]</th>
                                <th data-name="c4" class="">@Localizer["Column4"]</th>
               </tr>

If c2 is not sortable, and the user order the table by c3, jquery datatables will send index 2 to server.
As the model will be decorated with
[DataTableResolver(OrderableColumns = new[] { nameof(C1), nameof(C3), nameof(C4) }

As index 2 is sent to the server by datatables writing in the data callback:
JSON.stringify(data)

Then the server will wrongly assume we want to order on C4, whereas we clicked on C3 header.