Re: Breaking a really long thread

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+ Mon, 11 Apr 2016 00:19:24 -0700 (PDT)\r
+From: Mark Walters <markwalters1009@gmail.com>\r
+To: David Bremner <david@tethera.net>,\r
+ 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: <87oa9g7vd6.fsf@zancas.localnet>\r
+References: <c10e501c2baee471cbeeb42aad89a1e966407234-NM@bruno.deptj.eu>\r
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+Date: Mon, 11 Apr 2016 08:19:23 +0100\r
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+On Mon, 11 Apr 2016, David Bremner <david@tethera.net> wrote:\r
+> Mark Walters <markwalters1009@gmail.com> writes:\r
+>\r
+>> I think we already have this, except it is called\r
+>> notmuch-mua-hidden-headers. It defaults to '("^User-Agent:").\r
+>>\r
+>> I think it would be reasonable to add In-Reply-To to this list.\r
+>>\r
+>> However, if I read the code correctly, currently we are changing\r
+>> message-hidden-headers globally which doesn't feel the right thing to\r
+>> do. Probably we should do something more like you suggest, and do the\r
+>> overriding just in notmuch-message-mode.\r
+>>\r
+>\r
+> Summarizing, I see 3 related changes here\r
+>\r
+> - fixing the code to let-bind message-hidden-headers instead of globally\r
+>   modify it\r
+\r
+I have a patch doing this, but there is one problem that i don't see how\r
+to solve neatly. At the moment we set hidden-headers to the union of\r
+message-hidden-headers and notmuch-mua-hidden-headers. This means that\r
+if the user wants to show a header that is normally one of\r
+message-hidden-headers they have to set message-hidden-headers (ie they\r
+can't just change notmuch-mua-hidden headers).\r
+\r
+If we want it that people can show such a header just by changing a\r
+notmuch variable then I don't see how to do it neatly without breaking\r
+some existing setups.\r
+\r
+Any suggestions?\r
+\r
+Best wishes\r
+\r
+Mark\r
+\r
+>\r
+> - adding in-reply-to notmuch-mua\r
+>\r
+> - providing a keybinding to toggle visibility of hidden headers that\r
+>   works better than the current use of widen\r
+>\r
+> d\r