GNU bug report logs - #78859
31.0.50; Viewing mime part in Rmail sets truncate-lines

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Richard Stallman <rms <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; Viewing mime part in Rmail sets truncate-lines
Date: Sat, 21 Jun 2025 19:21:24 -0400

When I am looking at a message in Rmail, and it has a hidden
HTML mime part, and I activate the Show button, that sets
truncate-lines in te Rmail buffer, _permanently_.

It is done by this code in shr.el:

    ;; This probably won't work very well.
    (when (> (+ (cl-loop for width across sketch-widths
		         summing (1+ width))
		shr-indentation shr-table-separator-pixel-width)
	     (frame-width))
      (setq truncate-lines t))

I think the comment was prophetic.  This is a pain in the neck, as it
affects all other messages I look at in that buffer.  But I don't
understand this code enough to try to fix it.

Why, I wondered, does it use shr.el instead of running lynx?
Apparengly because of this in rmailmm.el:

    (defcustom rmail-mime-render-html-function
      (cond ((fboundp 'libxml-parse-html-region) #'rmail-mime-render-html-shr)
            ((executable-find "lynx") #'rmail-mime-render-html-lynx)
            (t nil))

That enabkes me to prevent the problem in my .emacs,
but it deserves a real fix that I can't wrote.



In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 2.24.33, cairo version 1.16.0) of 2024-08-01 built on freetop
Repository revision: a2c439db687774f7b57959c39560993579c5d1bd
Repository branch: master
System Description: Trisquel GNU/Linux Aramo (11.0.1)

Configured using:
 'configure 'CFLAGS=-O0 -g' --with-gnutls=ifavailable'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GPM GSETTINGS HARFBUZZ JPEG LIBOTF
LIBSELINUX LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XINPUT2
XPM GTK2 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: RMAIL

Minor modes in effect:
  gpm-mouse-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  minibuffer-regexp-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: linux
  auto-encryption-mode: t
  auto-compression-mode: t
  abbrev-mode: t

Load-path shadows:
None found.

Features:
(shadow emacsbug doc-view filenotify image-mode exif novice apropos
completion warnings cl-print debug backtrace find-func vc-git
vc-dispatcher bug-reference shortdoc comp-common ps-mode ps-samp
zeroconf printing man ps-mule ps-print ps-print-loaddefs lpr
display-line-numbers two-column kmacro rect format-spec battery dbus
jka-compr noutline outline help-fns radix-tree etags fileloop
generator xref project mule-util cal-move cal-menu calendar
cal-loaddefs epa-mail diff-mode track-changes diff sh-script rx
executable quail parse-time iso8601 vc-cvs vc-rcs log-view easy-mmode
pcvs-util mhtml-mode css-mode smie eww xdg url-queue mm-url gnus
nnheader range wid-edit color js c-ts-common treesit imenu cc-mode
cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine
cc-vars cc-defs sgml-mode facemenu ispell shell pcomplete thingatpt
files-x grep compile comint ansi-osc ansi-color ring rmailkwd cl-extra
help-mode textsec uni-scripts idna-mapping ucs-normalize
uni-confusable textsec-check bookmark pp shr pixel-fill kinsoku
url-file svg xml dom rmailout dabbrev misearch multi-isearch mailalias
qp rmailmm message sendmail yank-media puny rfc822 mml mml-sec epa epg
epg-config gnus-util text-property-search time-date mm-decode
mm-bodies mm-encode mailabbrev gmm-utils mailheader mail-parse rfc2231
dired-aux dired dired-loaddefs t-mouse term/linux view derived
disp-table advice rmailsum rmail rfc6068 rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils finder-inf info osm-autoloads package
browse-url url url-proxy url-privacy url-expand url-methods
url-history url-cookie generate-lisp-file url-domsuf url-util mailcap
url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs
icons password-cache json subr-x map byte-opt gv bytecomp byte-compile
url-vars cl-loaddefs cl-lib rmc iso-transl tooltip cconv eldoc paren
electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode
mwheel term/x-win x-win term/common-win x-dnd touch-screen tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer nadvice
seq simple cl-generic indonesian philippine cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese
eucjp-ms cp51932 hebrew greek romanian slovak czech european ethiopic
indian cyrillic chinese composite emoji-zwj charscript charprop
case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure
cl-preloaded button loaddefs theme-loaddefs faces cus-face macroexp
files window text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget keymap hashtable-print-readable
backquote threads dbusbind inotify dynamic-setting system-font-setting
font-render-setting cairo gtk x-toolkit xinput2 x multi-tty
move-toolbar make-network-process emacs)

Memory information:
((conses 16 883551 159991) (symbols 48 35406 40)
 (strings 32 136764 12191) (string-bytes 1 3162774) (vectors 16 75645)
 (vector-slots 8 1646651 179463) (floats 8 558 486)
 (intervals 56 84322 3761) (buffers 984 116))
[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]


-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)

Message #8 received at 78859 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: rms <at> gnu.org
Cc: 78859 <at> debbugs.gnu.org
Subject: Re: bug#78859: 31.0.50; Viewing mime part in Rmail sets truncate-lines
Date: Sun, 22 Jun 2025 08:14:46 +0300

> From: Richard Stallman <rms <at> gnu.org>
> Date: Sat, 21 Jun 2025 19:21:24 -0400
> 
> 
> When I am looking at a message in Rmail, and it has a hidden
> HTML mime part, and I activate the Show button, that sets
> truncate-lines in te Rmail buffer, _permanently_.

FTR: this doesn't seem to happen _every_ time I view HTML MIME message
in Rmail.  Which makes sense, since shr.el does that only when certain
conditions are true:

> It is done by this code in shr.el:
> 
>     ;; This probably won't work very well.
>     (when (> (+ (cl-loop for width across sketch-widths
> 		         summing (1+ width))
> 		shr-indentation shr-table-separator-pixel-width)
> 	     (frame-width))
>       (setq truncate-lines t))
> 
> I think the comment was prophetic.  This is a pain in the neck, as it
> affects all other messages I look at in that buffer.  But I don't
> understand this code enough to try to fix it.

I see no reason to fix shr.el, I have no reasons to believe it doesn't
DTRT in this case.  I think it should be enough to reset
truncate-lines back to its original value in rmail-show-message-1,
before showing the next message, so that the following messages aren't
affected.  Do you agree?

> Why, I wondered, does it use shr.el instead of running lynx?

Because it is always better to do something using Emacs' own
capabilities than rely on external programs (which may or may not be
available).  E.g., I don't have Lynx installed here.

Message #11 received at 78859 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: rms <at> gnu.org
Cc: 78859 <at> debbugs.gnu.org
Subject: Re: bug#78859: 31.0.50; Viewing mime part in Rmail sets truncate-lines
Date: Sun, 22 Jun 2025 08:23:45 +0300

> From: Richard Stallman <rms <at> gnu.org>
> Date: Sat, 21 Jun 2025 19:21:24 -0400
> 
> 
> When I am looking at a message in Rmail, and it has a hidden
> HTML mime part, and I activate the Show button, that sets
> truncate-lines in te Rmail buffer, _permanently_.

FTR: this doesn't seem to happen _every_ time I view HTML MIME message
in Rmail.  Which makes sense, since shr.el does that only when certain
conditions are true:

> It is done by this code in shr.el:
> 
>     ;; This probably won't work very well.
>     (when (> (+ (cl-loop for width across sketch-widths
> 		         summing (1+ width))
> 		shr-indentation shr-table-separator-pixel-width)
> 	     (frame-width))
>       (setq truncate-lines t))
> 
> I think the comment was prophetic.  This is a pain in the neck, as it
> affects all other messages I look at in that buffer.  But I don't
> understand this code enough to try to fix it.

I see no reason to fix shr.el, I have no reasons to believe it doesn't
DTRT in this case.  I think it should be enough to reset
truncate-lines back to its original value in rmail-show-message-1,
before showing the next message, so that the following messages aren't
affected.  Do you agree?

> Why, I wondered, does it use shr.el instead of running lynx?

Because it is always better to do something using Emacs' own
capabilities than rely on external programs (which may or may not be
available).  E.g., I don't have Lynx installed here, and neither do I
have it on my development account om gnu.org machines.

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