Extend the identifier used within the DOM by an additional field, as
already done in #97042 to make flexform sections within inline child
records work.

A styleguide example makes it easy to reproduce the edge case.

Resolves: #100937
Related: #97042
Releases: main, 12.4
Change-Id: I40120ea13b892c6387833dab444dad86951cf96f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85189


Tested-by: Garvin Hicking <gh@faktor-e.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>