Kendo UI v2017.2.504
I got java exception when restoring, changing selection : unable to get property mykeyfield...
I not sure, but it seems that in kendo.grid.js : string selector ':not(.k-grouping-row,.k-detail-row)' should be replaced with ':not(.k-grouping-row,.k-detail-row,.k-group-footer)' in _restoreSelection and selectable.change functions.
otherwise it search dataitem associated to the footer and it reaches a dead end.
Can you please confirm ?
Thank you in advance.