show_thread_nav = True , and take through https://github.com/briansniffen/notmuch/commit/021c914fc5cc1029778794cc5630373041066889

-- 
Brian Sniffen

> On Feb 15, 2018, at 11:06 AM, Daniel Kahn Gillmor <dkg@fifthhorseman.net> wrote:
> 
>> On Sun 2018-02-11 15:03:05 -0500, Daniel Kahn Gillmor wrote:
>>> On Sat 2018-02-10 13:57:34 -0500, Brian Sniffen wrote:
>>> It looks like you have thread next/pref turned off. Is there a reason,
>>> including the reason that I hadn’t documented it?
>> 
>> nope, i just didn't fiddle with it much beyond setting it up and trying
>> to make sure the system integration didn't seem wildly dangerous.  happy
>> to tweak it further, and will take any recommendations. :)
> 
> hm, looking into this a little bit, i don't actually see how to turn it
> on.  if you've got pointers or documentation, i would be happy to read
> it.
> 
>        --dkg