speters authored Dec 06, 2020 and Benni Mack committed Jan 06, 2022

Broken links are marked in RTE by using the attribute
data-rte-error in the <a> tag, which results in a
special style and lets the link be visible as broken.

Previously this was not done for links to hidden pages
and links to content elements. These links were however
detected as broken by linkvalidator and displayed in
the list of broken links. Marking them in RTE as well
makes the behaviour consistent.

This patch ensures the consistency between the list
and the visual highlighting in RTE elements for links
to hidden pages and hidden content elements.

Highlighting links to hidden pages/content elements
on hidden pages may be visually relaxed to a notice
instead of an error in a dedicated patch as feature.

One PHP8.0 array key warning is fixed along the way.

Resolves: #93005
Releases: main, 11.5
Change-Id: Ib1ef4b81ab862657950a38e5ee6847dd82abb13f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72913


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>