By catch on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
10.3.x
Introduced in version: 
10.3.0
Issue links: 
https://www.drupal.org/node/3296098
https://www.drupal.org/node/3440676
Description: 

When constructing a dialog AJAX command, passing $dialog_options['dialogClass'] is deprecated, and you should pass $dialog_options['classes'] instead.

Before

        '#attributes' => [
          'class' => ['use-ajax'],
          'data-dialog-type' => 'modal',
          'data-dialog-options' => Json::encode([
            'dialogClass' => 'no-close',
          ]),
        ],

After

'#attributes' => [
          'class' => ['use-ajax'],
          'data-dialog-type' => 'modal',
          'data-dialog-options' => Json::encode([
            'classes' => [
              'ui-dialog' => 'no-close',
            ],
          ]),
        ],
Impacts: 
Module developers
Themers