Can't save CKEditor 5 configuration when using filter_noopener

Thanks for reporting,

Will need a test case to show if this is a problem.

Add validation that was present in the older version.
Right now the method checkHtmlRestrictionsMatch is missing validation for unrestricted property for some of the filters. For example filter_noopener.

In which version was that validation present that is now absent?

AFAICT the problem is that https://git.drupalcode.org/project/noopener_filter/-/blob/8.x-2.x/src/Pl... declares itself as Drupal\filter\Plugin\FilterInterface::TYPE_HTML_RESTRICTOR, which is wrong.

It should be \Drupal\filter\Plugin\FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE.

✨ Support CKEditor 5 Active already exists for this.

Automatically closed - issue fixed for 2 weeks with no activity.