/* Execute a query for threads, returning a notmuch_threads_t object
* which can be used to iterate over the results. The returned threads
* object is owned by the query and as such, will only be valid until
/* Execute a query for threads, returning a notmuch_threads_t object
* which can be used to iterate over the results. The returned threads
* object is owned by the query and as such, will only be valid until