Issue #3348733: Allow themes to alter paragraphs_widget_actions

src/Plugin/Field/FieldWidget/ParagraphsWidget.php

@@ -798,8 +798,9 @@ class ParagraphsWidget extends WidgetBase {
           'allow_reference_changes' => $this->allowReferenceChanges(),
         ];
 
-        // Allow modules to alter widget actions.
+        // Allow modules and themes to alter widget actions.
         \Drupal::moduleHandler()->alter('paragraphs_widget_actions', $widget_actions, $context);
+        \Drupal::theme()->alter('paragraphs_widget_actions', $widget_actions, $context);
 
         if (!empty($widget_actions['actions'])) {
           // Expand all actions to proper submit elements and add it to top