BUG: trouble with forwarding with accents

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+From: Antoine =?utf-8?Q?Beaupr=C3=A9?= <anarcat@orangeseeds.org>\r
+To: Notmuch Mail <notmuch@notmuchmail.org>\r
+Subject: BUG: trouble with forwarding with accents\r
+User-Agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1\r
+ (x86_64-pc-linux-gnu)\r
+Date: Fri, 05 Feb 2016 17:44:50 -0500\r
+Message-ID: <87vb62ixp9.fsf@angela.anarcat.ath.cx>\r
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+\r
+So I have an accent in my family name, as you can see from the From\r
+header here. This has a tendency of finding the greatest and finest\r
+UTF-8 bug, and often no one believes me because they don't have that\r
+interesting property.\r
+\r
+Notmuch has been bugging me with such a problem for ages now. When I\r
+forward a mail, the accents in my name (or in the signature inserted)\r
+are broken. (Interstingly, I haven't *actually* been bothered by that\r
+bug for a while because I was using Emacs through an SSH console. Now,\r
+I'm using Emacs within a X11 terminal instead, "GNU Emacs 24.4.1\r
+(x86_64-pc-linux-gnu, GTK+ Version 3.14.5) of 2015-03-07 on trouble,\r
+modified by Debian".)\r
+\r
+Interestingly, piping that buffer into patebinit doesn't yield any errors:\r
+\r
+http://paste.debian.net/378776/\r
+\r
+Yet there is clearly an issue while writing the buffer, as you can see\r
+on this screenshot:\r
+\r
+http://paste.anarc.at/snap-2016.02.05-17.28.30.png\r
+\r
+Look at the buffer on the bottom: my accent (a &eacute;) is all busted\r
+in the From line, even though it is perfectly fine in *this* buffer. If\r
+I try to send that message (say to the `devnull` recipient), I get a\r
+nasty warning:\r
+\r
+```\r
+These default coding systems were tried to encode text\r
+in the buffer `1454711375.18796_680127_47.angela':\r
+  (utf-8-unix (21 . 4194243) (22 . 4194217))\r
+However, each of them encountered characters it couldn't encode:\r
+  utf-8-unix cannot encode these: \303 \251\r
+\r
+Click on a character (or switch to this window by `C-x o'\r
+and select the characters by RET) to jump to the place it appears,\r
+where `C-u C-x =' will give information about it.\r
+\r
+Select one of the safe coding systems listed below,\r
+or cancel the writing with C-g and edit the buffer\r
+   to remove or modify the problematic characters,\r
+or specify any other coding system (and risk losing\r
+   the problematic characters).\r
+\r
+  raw-text no-conversion\r
+```\r
+\r
+(Note that I rewrote the actual escape characters above to avoid to be\r
+"backslash number number number" instead of the actual escape sequence\r
+to avoid trouble, as I am sending this through emacs as well.)\r
+\r
+I usually [PLOKTA][1] my way through that warning, but I have no idea if\r
+the recipient receives something that is jumbled up or not. Besides,\r
+PLOKTA is not fun, I just feel like I look like this:\r
+\r
+http://i1.kym-cdn.com/photos/images/original/000/234/765/b7e.jpg\r
+\r
+ [1]: https://en.wikipedia.org/wiki/PLOKTA\r
+\r
+This sure smells like double-encoding. Is this notmuch's fault or\r
+message-mode, and how can i fix this stuff?\r
+\r
+This is notmuch 0.18 in Debian jessie.\r
+\r
+Thanks for any advice,\r
+\r
+A.\r
+\r
+-- \r
+Code is law.\r
+                         - Lawrence Lessig\r