Kendo grid grouping expand unexpectedly when columns virtualization is on

[Nick]

When columns virtualization is activated, grouping rows automatically expand (if collapsed), when scrolling the grid content.

Using this JsFiddle, try to scroll the grid vertically to reproduce the bug.

[Georgi Denchev]

Hello, Nick,

Thank you for the provided demo.

This behavior is expected as the Grid will rebind when new columns are loaded as you keep scrolling. Currently, the collapseGroup method is called once when the Grid initializes. However, when the Grid is re-bound, the groups will re-expand again.

You can use the dataBound event to collapse the group any time the grid is rebound.

          dataBound: function() {
            let grid = $("#grid").data("kendoGrid");
            grid.collapseGroup(".k-grouping-row");
          }

You can also extend the logic a bit and detect if the user has manually expanded the group. If they have, then stop collapsing it programmatically.

Best Regards,
Georgi Denchev
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