[regression] Class is not added to MediaLibrary dialog

I've tested it on D11.0.1 using the mentioned steps.
verified that the class "media-library-widget-modal" is attached.

Sharing SS for reference:

Hmm I wonder what is different then? I ran into this with a fresh install of Drupal 11 using the recommended composer template. I installed the umami profile. I also switched to Olivero in case there was something theme specific going on there.

On my actual production site which is on 10.3.x where the change had already taken place I don't experience this bug.

Did you test this on a new install or an existing site?

I tested it on new D11 instance.

@rhovland have you retested the issue?

I just tested it again. This time using the standard profile. Enabled the media module, added the embed media button to the basic text format.

Created a new basic page. Clicked the add media button. Class media-library-widget-modal is missing.

I had found another issue talking about this. I had noticed on my Drupal 11 site that the media library modal was narrower than in Drupal 10. I then found the missing class.

Changing the line in ckeditor5.ckeditor5.yml certainly fixes the problem.

I also tried adding the class in MediaLibrary.php. This worked too.

// Making the title for editor drupal media embed translatable.
    $static_plugin_config['drupalMedia']['dialogSettings'] = [
      'title' => $this->t('Add or select media'),
      'classes' => ['media-library-widget-modal'],
    ];

Looks like this affects other users as well but only some of them.

This is a patch applying the change suggested in the original ticket. It restores the line

dialogClass: media-library-widget-modal

to ckeditor5.ckeditor5.yml.