Add a quoted body stripping pattern for "> On ... at ... wrote:"

Summary: See @scottmac's reply in T3982. It looks like his email client uses the standard quote string, but includes it in the quoted block.

Test Plan: Added a failing unit test, made it pass.

Reviewers: btrahan

Reviewed By: btrahan

CC: scottmac, aran

Differential Revision: https://secure.phabricator.com/D7440

src/applications/metamta/parser/PhabricatorMetaMTAEmailBodyParser.php

@@ -51,7 +51,7 @@ final class PhabricatorMetaMTAEmailBodyParser {
 
   private function stripQuotedText($body) {
     $body = preg_replace(
-      '/^\s*On\b.*\bwrote:.*?/msU',
+      '/^\s*>?\s*On\b.*\bwrote:.*?/msU',
       '',
       $body);
 

src/applications/metamta/parser/__tests__/PhabricatorMetaMTAEmailBodyParserTestCase.php

@@ -149,6 +149,12 @@ From: Abraham Lincoln <alincoln@logcab.in>
 Subject: Core World Tariffs
 EOMAIL
 ,
+<<<EOMAIL
+OKAY
+
+> On 17 Oct 2013, at 17:47, "Someone" <somebody@somewhere> wrote:
+> ...
+EOMAIL
     );
   }