Fields are not reactive when used inside SimpleFormIterator

[WiXSL]

Related to #8359

None of the possible solutions work correctly when using a Field inside a SimpleFormIterator.
I put together a Stackblitz (https://stackblitz.com/edit/github-stqpcj?file=src%2Fposts%2FPostEdit.tsx) to show what I mean.

It shows tree components:
1- Labeled + FunctionField. => It works but with a warning for not using getSource
2- Labeled + TextField passing source='url' and record={scopedFormData}. => It works but with a warning for not using getSource
3- Labeled + TextField with source=getSource('url'). => Shows the data but doesn't change when an input of the same source changes (merged in #8359)

Reproduction:
1- Edit the Post of id=1 and click in Miscellaneous Tab.
2- In the Backlinks ArrayInput, type into the URL input to see the results

[slax57]

Thanks for this report.

I just tested solution 2 without passing the extra props, and it seems to be working too.
Can you confirm on your end?

If this is confirmed, then we should go for this solution, and maybe get rid of the warning (plus perhaps update the docs to explain that getSource is a useful helper but you loose reactivity when using it).

What do you think?

[WiXSL]

I agreee that removing th warning on solution two would be the way to go.
I'm pushing a PR shortly