updateItemBuilder property
An optional builder when an item in the list was changed but not its position.
The UpdatedItemBuilder
animation will run from 1 to 0 and back to 1 again, while
the item parameter will be the old item in the first half of the animation and the new item
in the latter half of the animation. This allows you for example to fade between the old and
the new item.
If not specified, changes will appear instantaneously.
Implementation
final UpdatedItemBuilder<Widget, E>? updateItemBuilder;