Provide an option to make thread summaries keep initial subject

diff --git a/2e/dcb5cc0ea6bc8b6d9993bf7df637f6012a866b b/2e/dcb5cc0ea6bc8b6d9993bf7df637f6012a866b
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+From: Olivier Berger <olivier.berger@it-sudparis.eu>\r
+Subject: Provide an option to make thread summaries keep initial subject\r
+Date: Tue, 25 Sep 2012 18:03:42 +0200\r
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+\r
+Hi.\r
+\r
+Whenever a participant changes the subject in the middle of a thread,\r
+the summary reported by notmuch search will change.\r
+\r
+However, the result is that some mails tend to "disappear" from search\r
+results, when (bad) participants reply instead of composing a new mail,\r
+and change a subject (see\r
+http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=688699 for more details\r
+on that problem, and a discussion). Of course, they're still there, but\r
+their subject being masked, one may then grep or C-s for a particular\r
+subject and miss them.\r
+\r
+I think it would be interesting to allow notmuch to potentially keep the\r
+original subject and not the most recent one for the thread summaries.\r
+\r
+What do you think ?\r
+\r
+Best regards,\r
+-- \r
+Olivier BERGER \r
+http://www-public.it-sudparis.eu/~berger_o/ - OpenPGP-Id: 2048R/5819D7E8\r
+Ingenieur Recherche - Dept INF\r
+Institut Mines-Telecom, Telecom SudParis, Evry (France)\r
+\r