- Patch #187061 by Rob Loach: give feedback when a comment was posted.

modules/comment/comment.module

@@ -736,6 +736,7 @@ function comment_save($edit) {
         drupal_set_message(t('Your comment has been queued for moderation by site administrators and will be published after approval.'));
       }
       else {
+        drupal_set_message(t('Your comment has been posted.'));
         comment_invoke_comment($edit, 'publish');
       }