OutOfBoundsException when configuring Style plugin for CKEditor

I just had this error on a fresh Drupal install.

Drupal 10.1.2 with gintheme + ckeditor5 module enabled.

I create a new editor and add the Style plugin.

Input the style a.button|Button and click outside the form element - so the input value is actually submitted.

Click save.

Boom. Broken :(

#10: please provide detailed steps to reproduce. Is this just a fresh install of Drupal core + gin, nothing else? No custom CKEditor 5 plugin?

Yes, fresh install of Drupal.

I've just retried and reproduce the issue.

It happens when you create a new text editor and you add all plugins.

Please find attached a screencapture with the first part where I install a fresh D10, I add a new CKE5 editor successfully - although there is always a bug on the first try - but then I add a new CKE5 editor with all options and it breaks.

I think these are the steps:

1. Fresh D10 install
2. Install with the standard profile `drush si standard -y`
3. Enable CKE5 `drush en ckeditor5`
4. Go to `/admin/config/content/formats/add`
5. Select CKE5 plugin
6. Add all buttons to the editor
7. Add at least one style (ex: `a.button|Button`)
8. Save the form
9. Boom, broken

PS: video is too big for d.o so I've sent it on Slack here: https://drupal.slack.com/archives/C01GWN3QYJD/p1709737334307729?thread_t...

The issue occurs when all plugins are enabled.
The Validator that throws an Exception is loading all enabled and disabled plugins separately for some validation:
$disabled_plugin_elements = new HTMLRestrictions($this->pluginManager->getProvidedElements(array_keys($enableable_disabled_plugins), $text_editor, FALSE));
The problem is that getProvidedElements() returns all plugins in case first parameter is empty. I'll prepare a patch shortly.

Here is the patch against 10.2.2
matthieuscarset, I can send you patch for 10.1.2 on Slack in case this won't work

BTW: Wim when I'm posting a patch with name format {issue_number}-{comment-number} do I have to put {comment-number} manually and hope that nobody else will post or can the name be somehow generated automatically?

The Needs Review Queue Bot → tested this issue.

While you are making the above changes, we recommend that you convert this patch to a merge request → . Merge requests are preferred over patches. Be sure to hide the old patch files as well. (Converting an issue to a merge request without other contributions to the issue will not receive credit.)

I reproduced the error on a fresh install of 11.x.