post event TopicDidCopy when copying topis from inside a course, fixes #628

Closes #628

Merge request studip/studip!307

app/controllers/course/topics.php

@@ -152,6 +152,8 @@ class Course_TopicsController extends AuthenticatedController
                 $topic->setId($topic->getNewId());
                 $topic->setNew(true);
                 $topic->store();
+
+                NotificationCenter::postNotification('TopicDidCopy', $topic_id, $topic->id);
             }
             PageLayout::postMessage(MessageBox::success(sprintf(_("%s Themen kopiert."), count(Request::getArray("topic")))));
             $this->redirect("course/topics");