Re: [PATCH 1/6] lib: Only sync modified message documents

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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: Re: [PATCH 1/6] lib: Only sync modified message documents\r
+In-Reply-To: <1433525318-23756-2-git-send-email-david@tethera.net>\r
+References: <1432936375-astroid-4-0i1n6yczs2-1520@strange>\r
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+Date: Tue, 04 Aug 2015 09:07:45 +0200\r
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+David Bremner <david@tethera.net> writes:\r
+\r
+> From: Austin Clements <amdragon@mit.edu>\r
+>\r
+> Previously, we updated the database copy of a message on every call to\r
+> _notmuch_message_sync, even if nothing had changed.  In particular,\r
+> this always happens on a thaw, so a freeze/thaw pair with no\r
+> modifications between still caused a database update.\r
+>\r
+> We only modify message documents in a handful of places, so keep track\r
+> of whether the document has been modified and only sync it when\r
+> necessary.  This will be particularly important when we add message\r
+> revision tracking.\r
+\r
+This patch makes some sense without the rest of lastmod series, so I\r
+merged it early to get some testing.\r
+\r
+d\r