It is no longer possible to add multiple field states

This visually solves the issue, but it breaks the tests. I'll look into modifying my stack to accommodate JavaScript functional tests and see how to address this more properly.

Finally, there seems to be an issue with loading test dependencies, such as the YouTube module for instance. This is not due to the fix, as I encounter the same problem without making any modifications. If anyone has an idea to fix this, please let me know.

Hi bakop, thank you for your quick solution, it resolved my blocker to move on!

Issue with test dependencies seems to be resolved in https://www.drupal.org/project/field_states_ui/issues/3416385#comment-15... 🐛 YoutubeFieldTest::testYoutubeField Undefined array key "youtube" Active

I would suggest removing uuid from the default $configuration array because it is redundant AFAIK, but it could be argued that change is beyond the scope of this issue:

$configuration += [
  'data' => [],
  'uuid' => '',
];

Once 🐛 YoutubeFieldTest::testYoutubeField Undefined array key "youtube" Active has been committed then these test failures will disappear, therefore this will be ready to merge too.

Setting to RTBC to speed the process along, but if my suggested change is made then I will review again.