Have Maniphest use create transactions when using email

Summary: Fixes T12929. Sets a create transaction if new.

Test Plan: test a new task over email via command line

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12929

Differential Revision: https://secure.phabricator.com/D18279

src/applications/maniphest/mail/ManiphestReplyHandler.php

@@ -24,6 +24,10 @@ final class ManiphestReplyHandler
     $xactions = array();
 
     if ($is_new) {
+      $xactions[] = $this->newTransaction()
+        ->setTransactionType(PhabricatorTransactions::TYPE_CREATE)
+        ->setNewValue(true);
+
       $xactions[] = $this->newTransaction()
         ->setTransactionType(ManiphestTaskTitleTransaction::TRANSACTIONTYPE)
         ->setNewValue(nonempty($mail->getSubject(), pht('Untitled Task')));