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Andreas Fernandez authored Aug 29, 2019 and Frank Nägler committed Sep 11, 2019

This patch fixes some flaws in the IRRE uniqueness handling:

- Validation is triggered once a record has been removed from DOM
- Removed records are now added to their selector again if not opened
  before
- Uniqueness handling now works for records with uid "0", which is
  relevant for a site's language handling
- The unique update is now triggered only when the value of its selector
  in a record actually changes

Resolves: #87711
Releases: master, 9.5
Change-Id: I9fe15d8e8790eff305024b706450cd2c37da9340
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61578

Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Susanne Moog <look@susi.dev>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Frank Nägler <frank.naegler@typo3.org>