Issue #3105580 by Hardik_Patel_12, siddhant.bhosale: Move HTML classes from...

Issue #3105580 by Hardik_Patel_12, siddhant.bhosale: Move HTML classes from claro_preprocess_checkboxes to a template

core/themes/claro/claro.theme

@@ -861,13 +861,6 @@ function claro_preprocess_form_element__password(&$variables) {
   }
 }
 
-/**
- * Implements template_preprocess_HOOK() for checkboxes.
- */
-function claro_preprocess_checkboxes(&$variables) {
-  $variables['attributes']['class'][] = 'form-boolean-group';
-}
-
 /**
  * Implements template_preprocess_HOOK() for radios.
  */

core/themes/claro/templates/form/checkboxes.html.twig

+{#
+/**
+ * @file
+ * Theme override for a 'checkboxes' #type form element.
+ *
+ * Available variables
+ * - attributes: A list of HTML attributes for the wrapper element.
+ * - children: The rendered checkboxes.
+ *
+ * @see template_preprocess_checkboxes()
+ */
+ @todo: remove this file once https://www.drupal.org/node/1819284 is resolved.
+ This is identical to core/modules/system/templates/container.html.twig
+#}
+<div{{ attributes.addClass('form-checkboxes','form-boolean-group') }}>{{ children }}</div>