Issue #3419324: Revision notes field not cleared after save

src/Entity/MercuryEditorEntityFormTrait.php

@@ -9,6 +9,7 @@ use Drupal\Core\Ajax\ReplaceCommand;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Entity\RevisionableInterface;
 use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Entity\ContentEntityTypeInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
@@ -249,6 +250,16 @@ trait MercuryEditorEntityFormTrait {
         $this->layoutParagraphsTempstore->set($layout);
       }
     }
+    // Clear the revision log message input to prevent it from being reused.
+    $entity_type = $this->entity->getEntityType();
+    if ($entity_type instanceof ContentEntityTypeInterface) {
+      $revision_field = $entity_type->getRevisionMetadataKey('revision_log_message');
+      if ($revision_field) {
+        $input = $form_state->getUserInput();
+        $input[$revision_field] = [];
+        $form_state->setUserInput($input);
+      }
+    }
     // Re-initialize the form to correctly prepare the saved entity.
     $this->init($form_state);
   }