What is the status of this task ?

To support this, we need new factory which make in List or Grid Item not Layout, which may allow to set size manually without layout_sizing_eval.
factory could support homogeneous_size_set/get().

additionally, our genlist cache the size of items and managed the calculation result though the item is out of viewport.
so we don't need to re-calculate the size again when it comes back.

I think we might need similar kind of size caching in our listview, to optimize size calculations, if not, we need to calculate the item's size in every single scroll movement.
I don't know where we need to store this cached data, this data might be very releated with view-side so listview or factory could handles it,
but on the other hand, we could store view-related data in viewmodel, so some kind of helper may necessary.

@cedric and @felipealmeida what do you think of this?

All this patch did land and I consider this task done. Open a new task if you have any bugs or feature miss.