[PATCH 3/3] notmuch-tag: don't sort messages before applying tag changes

[Sebastian Spaeth <Sebastian@SSpaeth.de>]

It's not neccessary to sort the results before we apply tags. Xapian
contributor Olly Betts says that savings might be bigger with a cold
file cache and (as unsorted implies really sorted by document id) a better
cache locality when applying tags to messages.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
---
 notmuch-tag.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/notmuch-tag.c b/notmuch-tag.c
index 8b6f7dc..fd54bc7 100644
--- a/notmuch-tag.c
+++ b/notmuch-tag.c
@@ -107,6 +107,9 @@ notmuch_tag_command (void *ctx, unused (int argc), unused (char *argv[]))
 	return 1;
     }
 
+    /* tagging is not interested in any special sort order */
+    notmuch_query_set_sort (query, NOTMUCH_SORT_UNSORTED);
+
     for (messages = notmuch_query_search_messages (query);
 	 notmuch_messages_valid (messages) && !interrupted;
 	 notmuch_messages_move_to_next (messages))
-- 
1.7.0.4