RFC: do what jamie wants with notmuch tag

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+From: David Bremner <david@tethera.net>\r
+To: David Bremner <david@tethera.net>, notmuch@notmuchmail.org\r
+Subject: RFC: do what jamie wants with notmuch tag\r
+Date: Thu, 30 Jun 2016 10:40:25 +0200\r
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+\r
+The second patch in particular could be cleaned up; there is definitely some\r
+duplication between the two code paths, so opening the database and\r
+creating a query could/should be refactored.\r
+\r
+It seems somewhat reasonable to have notmuch_query_search_tags in the\r
+API. I would say just document the limitation of ignoring excludes\r
+when querying for all tags, otherwise that optimization (which is a\r
+huge speed improvement) will mostly be useless.\r
+\r
+\r