Passing additional logic to the `expand` function

[s1gr1d]

Description

Like @update:sort, it would be useful to have @update:expand to be able to perform some logic like fetching additional data or something else.

ref: https://github.com/nuxt/ui/pull/803

Additional context

No response

[husayt]

Also, would be very useful to be able to disable expand for selected rows, i.e. be able to pass a function which will decide to display or not display expand for given row