Re: Breaking a really long thread

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+From: David Bremner <david@tethera.net>\r
+To: Daniel Kahn Gillmor <dkg@fifthhorseman.net>,\r
+ David Mazieres expires 2016-07-03 PDT\r
+ <mazieres-297ctmng4fhr6h6ad8yffa64yi@temporary-address.scs.stanford.edu>,\r
+ notmuch@notmuchmail.org\r
+Subject: Re: Breaking a really long thread\r
+In-Reply-To: <8760vrm3jk.fsf@alice.fifthhorseman.net>\r
+References: <c10e501c2baee471cbeeb42aad89a1e966407234-NM@bruno.deptj.eu>\r
+ <87k2kd8r6d.fsf@qmul.ac.uk> <87wpoc7hf8.fsf@ta.scs.stanford.edu>\r
+ <8760vrm3jk.fsf@alice.fifthhorseman.net>\r
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+Date: Sat, 09 Apr 2016 15:55:55 -0300\r
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+Daniel Kahn Gillmor <dkg@fifthhorseman.net> writes:\r
+\r
+> On Tue 2016-04-05 01:28:43 -0400, David Mazieres wrote:\r
+>> Arguably, I would say either both the In-Reply-To and the References\r
+>> header should be hidden or neither.  Otherwise, what was happening is\r
+>> that I was deleting the In-Reply-To header as it was the only one I saw,\r
+>> and figuring that maybe References was adjusted after the fact based on\r
+>> In-Reply-To.  After all, the message buffer doesn't keep track of the\r
+>> parent message.\r
+>>\r
+>> Unless there's a reason that someone would want to alter In-Reply-To\r
+>> without altering References, it doesn't make sense to show one without\r
+>> the other.\r
+>\r
+> I think i agree with David here, but the fact is that\r
+> message-hidden-headers is derived directly from emacs (in message.el),\r
+> and isn't part of notmuch-emacs at all.\r
+>\r
+> Are these changes worth addressing upstream?\r
+\r
+Possibly. Although changing defaults is usually a cesspit of\r
+bikeshedding.  What would we ask, that upstream add In-Reply-To to\r
+message-hidden-headers?\r
+\r
+Related, showing hidden headers doesn't actually work very well:\r
+\r
+         http://debbugs.gnu.org/cgi/bugreport.cgi?bug=23252\r
+\r
+I thought briefly about overriding the value in notmuch-message-mode,\r
+perhaps by having a defcustom for notmuch-message-hidden-headers.\r
+\r
+d\r