[Updated] Feature/hook field widget multivalue form alter

govcms.profile

@@ -71,3 +71,17 @@ function govcms_field_widget_form_alter(&$element, FormStateInterface $form_stat
   // $context['widget']->getPluginId().
   \Drupal::theme()->alter(['field_widget_form'], $element, $form_state, $context);
 }
+
+/**
+ * Implements hook_field_widget_multivalue_form_alter().
+ */
+function govcms_field_widget_multivalue_form_alter(&$elements, FormStateInterface $form_state, $context) {
+  // In Drupal 7 `hook_field_widget_multivalue_form_alter` could be implemented
+  // by the theme, but in Drupal 8 this hook changed to being module-only.
+  // This hook can be critical for improving the editor experience for things
+  // like paragraphs. Implementing themes can access the plugin ID via
+  // $context['widget']->getPluginId().
+  \Drupal::theme()->alter([
+    'field_widget_multivalue_form',
+  ], $elements, $form_state, $context);
+}