Data grouping

[vadimffe]

Is your feature request related to a problem? Please describe.
I am testing TableView but having hard times figuring out how to implement data grouping. Is there some example or solution hot to group data in TableView? Like in https://learn.microsoft.com/en-us/windows/communitytoolkit/controls/datagrid_guidance/group_sort_filter

Would be good to have such a functionality with possibility to collapse expand data, in line edit, remove and etc.

As in the screenshot below to have head item with sub items that are summed up in the head item.

[w-ahmad]

TableView is inherited from ListView and I don't think ListView offers item groups that can expand or collapse. However, I can try to implement item groups like ListView provides.