Enable access to individual item state in ->collapsed() callback for Repeaters

[hacheraw]

I have Order and it has many associated Items and I use a Repeater to edit or add Items to an Order

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Currently, when creating a Form, the ->collapsed() callback on a Repeater component only receives the full state array representing all items, limiting the ability to control collapse behavior per item.

In contrast, other callbacks like ->itemLabel() receive the state of the current item, allowing for per-item customization.

Allowing ->collapsed() to receive the single item state would enable developers to dynamically collapse or expand each repeater item based on its own data, for example, expanding tasks only if their done field is false.

This feature would provide finer-grained control over the UI and improve the user experience when working with repeaters containing multiple items.

May be related: #5273

[hacheraw]

Hey, i looked into Laravel 4.x docs and there are more utilities.
Looking at the https://filamentphp.com/docs/4.x/forms/repeater#collapsing-items table, nothing working for me.

But looking into https://filamentphp.com/docs/4.x/forms/repeater#adding-a-label-to-repeater-items-based-on-their-content table, I noticed "item" param. And it worked in ->collapsed() callback:
// Filament 4 beta
->collapsed(function ($item): bool {
return $operation != "create" && $item->model->done;
})

PS:
I had to remove some incompatible plugins to update to Filament 4 beta to try this.

Then, I discarded all the changes and went back to 3.x just to confirm it also works even while not stated in the 3.x docs.