bug#57432: 27.1; doc-view-enlarge/shrink behaviour does not match documentation

bug#57432: 27.1; doc-view-enlarge/shrink behaviour does not match documentation

[Iago]

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Hi,

I started Emacs with emacs -Q. Then, open any pdf file and try to use zoom
capabilities of DocView mode. Reading the DocView documentation I
understand that to doc-view-enlarge, first I should type C-c (as the
Prefix Command) followed by typing +. But this produces the message
C-c + is undefined
The way I got the zoom behaviour is typing + two consecutive times (++),
regardless of having typed before C-c or not. I am not sure if this is a
bug or Maybe I am not understanding the documentation in the correct
way.
Same happens for doc-view-shrink.
I keep below all the information produced by M-x report-emacs-bug.

Thank you!

Best regards,
Iago






In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.24, 
cairo version 1.16.0)
of 2021-03-28, modified by Debian built on x86-conova-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)

Recent messages:
Mark saved where search started [3 times]
funcall-interactively: Buffer is read-only: #[32 times]
C-c + is undefined
Quit

Making completion list...
previous-line: Beginning of buffer [13 times]
next-line: End of buffer [10 times]
Type "q" in help window to restore its previous buffer, C-M-v to scroll 
help.
M-º is undefined

Configured using:
'configure --build x86_64-linux-gnu --prefix=/usr
--sharedstatedir=/var/lib --libexecdir=/usr/lib
--localstatedir=/var/lib --infodir=/usr/share/info
--mandir=/usr/share/man --enable-libsystemd --with-pop=yes
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp 

--with-sound=alsa --without-gconf --with-mailutils --build
x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
--libexecdir=/usr/lib --localstatedir=/var/lib
--infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd
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--with-sound=alsa --without-gconf --with-mailutils --with-cairo
--with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars
'CFLAGS=-g -O2
-ffile-prefix-map=/build/emacs-LlFm6W/emacs-27.1+1=. 
-fstack-protector-strong
-Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
-D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD
JSON PDUMPER LCMS2 GMP

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

Major mode: DocView

Minor modes in effect:
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shell-dirtrack-mode: t
tooltip-mode: t
global-eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
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auto-compression-mode: t
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-- 
Iago Giné-Vázquez (0000-0002-6725-2638 
<https://orcid.org/0000-0002-6725-2638>)

Centro de Investigación Biomédica en Red de Salud Mental, Instituto de 
Salud Carlos III (CIBERSAM, ISCIII), Av. Monforte de Lemos, 3-5. 
Pabellón 11. Planta 0, 28029 Madrid, Spain
Epidemiology of Mental Health Disorders and Ageing, Institut de Recerca 
Sant Joan de Déu, Santa Rosa 39-57, 08950 Esplugues de Llobregat, Spain
Research, Innovation and Teaching Unit, Parc Sanitari Sant Joan de Déu, 
Doctor Antoni Pujadas 42, 08830 Sant Boi de Llobregat, Spain

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bug#57432: 27.1; doc-view-enlarge/shrink behaviour does not match documentation

[Lars Ingebrigtsen]

Iago <iago.gine@sjd.es> writes:

> I started Emacs with emacs -Q. Then, open any pdf file and try to use zoom 
> capabilities of DocView mode. Reading the DocView documentation I 
> understand that to doc-view-enlarge, first I should type C-c (as the 
> Prefix Command) followed by typing +. But this produces the message 
> C-c + is undefined 

Where do you read this?  In Emacs 27.1 in the Emacs manual, it says:

---
  You can enlarge or shrink the document with @kbd{+}
(@code{doc-view-enlarge}) and @kbd{-} (@code{doc-view-shrink}).
---

bug#57432: 27.1; doc-view-enlarge/shrink behaviour does not match documentation

[Iago]

I read this in the DocView documentation as it appears when typing 'C-h 
m' in the DocView mode.

On 27/08/2022 15:49, Lars Ingebrigtsen wrote:
> Iago <iago.gine@sjd.es> writes:
>
>> I started Emacs with emacs -Q. Then, open any pdf file and try to use zoom
>> capabilities of DocView mode. Reading the DocView documentation I
>> understand that to doc-view-enlarge, first I should type C-c (as the
>> Prefix Command) followed by typing +. But this produces the message
>> C-c + is undefined
> Where do you read this?  In Emacs 27.1 in the Emacs manual, it says:
>
> ---
>    You can enlarge or shrink the document with @kbd{+}
> (@code{doc-view-enlarge}) and @kbd{-} (@code{doc-view-shrink}).
> ---
-- 

bug#57432: 27.1; doc-view-enlarge/shrink behaviour does not match documentation

[Iago]

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I've just found the quote inside the Emacs manual, but further, I 
realized now that in the DocView documentation I had seen, between the

C-c Prefix Command

line (above) and the

+ doc-view-enlarge

line (below) there is another Prefic Command line

ESC Prefix Command

so it was my fail typing C-c before +, which was the reason for no 
working. If I do ESC +, it works fine.


Sorry for the spam. Thanks!

Iago

On 27/08/2022 15:49, Lars Ingebrigtsen wrote:
> Iago<iago.gine@sjd.es>  writes:
>
>> I started Emacs with emacs -Q. Then, open any pdf file and try to use zoom
>> capabilities of DocView mode. Reading the DocView documentation I
>> understand that to doc-view-enlarge, first I should type C-c (as the
>> Prefix Command) followed by typing +. But this produces the message
>> C-c + is undefined
> Where do you read this?  In Emacs 27.1 in the Emacs manual, it says:
>
> ---
>    You can enlarge or shrink the document with @kbd{+}
> (@code{doc-view-enlarge}) and @kbd{-} (@code{doc-view-shrink}).
> ---
-- 
Iago Giné-Vázquez (0000-0002-6725-2638 
<https://orcid.org/0000-0002-6725-2638>)

Centro de Investigación Biomédica en Red de Salud Mental, Instituto de 
Salud Carlos III (CIBERSAM, ISCIII), Av. Monforte de Lemos, 3-5. 
Pabellón 11. Planta 0, 28029 Madrid, Spain
Epidemiology of Mental Health Disorders and Ageing, Institut de Recerca 
Sant Joan de Déu, Santa Rosa 39-57, 08950 Esplugues de Llobregat, Spain
Research, Innovation and Teaching Unit, Parc Sanitari Sant Joan de Déu, 
Doctor Antoni Pujadas 42, 08830 Sant Boi de Llobregat, Spain

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bug#57432: 27.1; doc-view-enlarge/shrink behaviour does not match documentation

[Lars Ingebrigtsen]

Iago <iago.gine@sjd.es> writes:

> I read this in the DocView documentation as it appears when typing
> 'C-h m' in the DocView mode.

In Emacs 27.1, this says:

key             binding
---             -------

C-c		Prefix Command
RET		image-next-line
C-n		doc-view-next-line-or-next-page
C-p		doc-view-previous-line-or-previous-page
C-r		doc-view-search-backward
C-s		doc-view-search
C-t		doc-view-show-tooltip
ESC		Prefix Command
SPC		doc-view-scroll-up-or-next-page
+		doc-view-enlarge
-		doc-view-shrink

This does not mean that `C-c' is the prefix key for all the stuff
that's underneath it -- it just means that `C-c' is a prefix command
(and is unrelated to the stuff below).

This display has been changed in Emacs 29 -- we don't mention the prefix
commands at all, because that brings no value.

bug#57432: 27.1; doc-view-enlarge/shrink behaviour does not match documentation

[Lars Ingebrigtsen]

Iago <iago.gine@sjd.es> writes:

> line (below) there is another Prefic Command line
>
> ESC Prefix Command
>
> so it was my fail typing C-c before +, which was the reason for no working. If I do ESC
> +, it works fine.

No, the lines are unrelated to each other.

The enlargening command is simply `+' -- no more, no less.