Change all clarifications in thread

By always finding the first in thread and changing the replies
afterwards. Verified that this also works via the overview clarification
page.

webapp/src/Controller/Jury/ClarificationController.php

@@ -352,7 +352,17 @@ public function changeQueueAction(Request $request, int $clarId): Response
         if ($queue === "") {
             $queue = null;
         }
-        $clarification->setQueue($queue);
+
+        // Either this is the first in a thread (of 1 or more) or this 2nd or more.
+        $firstClarification = $clarification->getInReplyTo();
+        $curClarification = $clarification;
+        if ($firstClarification) {
+            $curClarification = $firstClarification;
+        }
+        foreach ($curClarification->getReplies() as $reply) {
+            $reply->setQueue($queue);
+        }
+        $curClarification->setQueue($queue);
         $this->em->flush();
 
         if ($request->isXmlHttpRequest()) {