Enabling and disabling maildir.synchronize_flags

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+Subject: Enabling and disabling maildir.synchronize_flags\r
+Reply-To: David Mazieres expires 2015-09-29 PDT\r
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+Date: Wed, 01 Jul 2015 12:58:36 -0700\r
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+\r
+Sorry if this question is answered somewhere, but I'm wondering:  What\r
+is the best way to enable and disable maildir.synchronize_flags?\r
+\r
+It seems that disabling it should simply be safe.  But re-enabling, one\r
+risks losing tags, as the next notmuch new will cause old maildir flags\r
+to override the xapian database.  So that suggests something like:\r
+\r
+   notmuch dump > backup\r
+   notmuch config set maildir.synchronize_flags false\r
+   # Do I need to run notmuch new here?\r
+   notmuch restore < backup\r
+\r
+Is that safe?  The man page suggests one additionally need to run\r
+notmuch new before running notmuch restore.  All of this is pretty slow.\r
+Is there a more efficient way?\r
+\r
+A one or two sentence clarification in the notmuch-config man page might\r
+be helpful to people contemplating playing with this switch.  The\r
+default is on, to I suspect it costs a lot of performance.  I've been\r
+afraid to turn it off for fear that I won't be able to undo this\r
+cleanly.\r
+\r
+Thanks,\r
+David\r