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Subject: bug#46590: 27.1.91; abnormal whitespace-mode behavior
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--text follows this line--

Recipe to reproduce the bug:

1) I'm using emacs version 27.1.91 built from git sources in my /home
   directory (same bug is experimented with emacs version 26.1 installed
   from debian stable package). Command used to run emacs:

emacs -Q test.txt &

2) M-x whitespace-mode RET

3) type the following text (=C2=AB.=C2=BB for spacebar key):

=C2=AB....First line of text in emacs=C2=BB, then type RET

4) DEL DEL to suppress backward two spaces on line 2, then type text
=C2=ABSecond one=C2=BB

5) M-2 M-b

6) TAB TAB TAB TAB: point should be at line 2, column 18, vertically
aligned with fourth word of line 1 (=C2=ABtext=C2=BB), but it is at column =
26:
that's the bug.

Rq1: what is curious (to me) is that deactivating whitespace-mode
removes abnormally inserted tab character (8 spaces) and everything is
OK.

Rq2: I noted that with a different text, this behavior of
whitespace-mode disappears. For example, if one uses the following first
line of text:

=C2=AB....This.is.a.first.line.of.text.with.a.few.words=C2=BB,

then the result of typing TAB multiple times is as expected, with or
without whitespace-mode activated!

Rq3: as I'm not an emacs expert, I first posted on help-gnu-emacs list
in order to see if someone could explain me what I was missing:

https://lists.gnu.org/archive/html/help-gnu-emacs/2021-02/msg00321.html

Nobody explained me why I see this behavior (of whitespace-mode), thus I
came to the conclusion it might be a bug (both answers are from persons
using emacs 28.0.50). I must say that I followed as precisely as I could
the advices found to submit a bug, in particular I read and followed
=C2=AB52-Reporting bugs=C2=BB of emacs manual.

--end of bug description--

In GNU Emacs 27.1.91 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.5)
 of 2021-02-04 built on Cornafion
Repository revision: 89f1634afcca318def07151424a21b81c70acd76
Repository branch: emacs-27
Windowing system distributor 'The X.Org Foundation', version
11.0.12004000 System Description: Debian GNU/Linux 10 (buster)

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Whitespace mode enabled in current buffer
You can run the command =E2=80=98whitespace-mode=E2=80=99 with M-x whit-m R=
ET
Whitespace mode enabled in current buffer
Auto-saving...done
Auto-saving...done
Making completion list...

Configured using:
 'configure --prefix=3D/home/fred/emacs-03022021/'

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

Important settings:
  value of $LC_MONETARY: fr_FR.UTF-8
  value of $LC_NUMERIC: fr_FR.UTF-8
  value of $LC_TIME: fr_FR.UTF-8
  value of $LANG: fr_FR.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Text

Minor modes in effect:
  whitespace-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
format-spec rfc822 mml easymenu mml-sec password-cache epa derived epg
epg-config gnus-util rmail rmail-loaddefs text-property-search seq
byte-opt gv bytecomp byte-compile cconv mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils time-date subr-x
cl-loaddefs cl-lib disp-table whitespace tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame minibuffer cl-generic 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 charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind inotify lcms2 dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 49999 5008)
 (symbols 48 6166 1)
 (strings 32 16282 1605)
 (string-bytes 1 538103)
 (vectors 16 10378)
 (vector-slots 8 138289 8918)
 (floats 8 20 41)
 (intervals 56 535 0)
 (buffers 1000 14))

--
  Fr=C3=A9d=C3=A9ric Baldit

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To: =?UTF-8?Q?Fr=C3=A9d=C3=A9ric?= Baldit <frederic.baldit@HIDDEN>
Subject: bug#46590: Acknowledgement (27.1.91; abnormal whitespace-mode
 behavior)
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Date: Wed, 17 Feb 2021 15:25:01 +0000

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46590: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D46590
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Subject: bug#46590: 27.1.91; abnormal whitespace-mode behavior
Resent-From: Bhavin Gandhi <bhavin7392@HIDDEN>
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On Wed, 17 Feb 2021 at 20:55, Fr=C3=A9d=C3=A9ric Baldit <frederic.baldit@fr=
ee.fr> wrote:
>
> 3) type the following text (=C2=AB.=C2=BB for spacebar key):
>

I was able to reproduce the behavior by following the steps above, thought =
of
replying to clarify that I used SPC at the places where the given text
has =C2=AB or =C2=BB character.

--=20
Warm Regards,
Bhavin Gandhi (bhavin192) | https://geeksocket.in

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Subject: bug#46590: 27.1.91; abnormal whitespace-mode behavior
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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Date: Sat, 20 Feb 2021 11:27:25 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <20210217150614.1eaecfdd@HIDDEN> (message from
 =?UTF-8?Q?Fr=C3=A9d=C3=A9ric?=
 Baldit on Wed, 17 Feb 2021 15:06:14 +0100)
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> Date: Wed, 17 Feb 2021 15:06:14 +0100
> From: Frédéric Baldit <frederic.baldit@HIDDEN>
> 
> emacs -Q test.txt &
> 
> 2) M-x whitespace-mode RET
> 
> 3) type the following text («.» for spacebar key):
> 
> «....First line of text in emacs», then type RET
> 
> 4) DEL DEL to suppress backward two spaces on line 2, then type text
> «Second one»
> 
> 5) M-2 M-b
> 
> 6) TAB TAB TAB TAB: point should be at line 2, column 18, vertically
> aligned with fourth word of line 1 («text»), but it is at column 26:
> that's the bug.

It's a known misfeature of whitespace-mode.  There's a comment in
whitespace.el to that effect:

    ;; WARNING: the mapping below has a problem.
    ;; When a TAB occupies exactly one column, it will display the
    ;; character ?\xBB at that column followed by a TAB which goes to
    ;; the next TAB column.
    ;; If this is a problem for you, please, comment the line below.
    (tab-mark     ?\t    [?» ?\t] [?\\ ?\t])	; tab - right guillemet

You could customize whitespace-display-mappings to remove tab-mark
from it, if you want to avoid this issue.

> Rq1: what is curious (to me) is that deactivating whitespace-mode
> removes abnormally inserted tab character (8 spaces) and everything is
> OK.

That's because disabling whitespace-mode deactivates the display-table
mappings, which include the above mapping.

> Rq2: I noted that with a different text, this behavior of
> whitespace-mode disappears. For example, if one uses the following first
> line of text:
> 
> «....This.is.a.first.line.of.text.with.a.few.words»,
> 
> then the result of typing TAB multiple times is as expected, with or
> without whitespace-mode activated!

Most probably because the "TAB occupies exactly one column" condition
doesn't happen there.

Thanks.

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From: =?UTF-8?Q?Fr=C3=A9d=C3=A9ric?= Baldit <frederic.baldit@HIDDEN>
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Thank you for your message and for pointing out the warning in
whitespace.el code.
Now I can better understand what is triggering this bad display. For
example, the following text yields the same result:
........First line of text in emacs
.......
(eight spaces at beginning of line 1, 7 at beginning of line 2, point
at end of line 2). Then typing TAB inserts 1 TAB symbol (character
'=C2=BB', \xBB) followed by eight grouped spaces (1 TAB), whereas only one
'=C2=BB' should be indeed be displayed.

I'm quite surprised by this, because to me it's not so marginal and
unused. Also whitespace.el is now builtin with emacs. And emacs is
such a long-time proven editor, I think it can be quite disappointing to
see such a =C2=ABflat=C2=BB (I mean trivial) bug in it.

I just began reading whitespace.el, in particular the use of the
display table, which seems to be crucial here. But I'm just
learning emacs (and emacs lisp), so there could be a long way
before I can truly  (and deeply) understand whitespace.el code and see
how to fix the bug.

I asked myself: should I contact the maintainer of whitespace.el
(Vinicius Jose Latorre) to get some help?

--
  Fr=C3=A9d=C3=A9ric Baldit

Le sam. 20 f=C3=A9vr. 2021 =C3=A0 11:27:25 +0200
Eli Zaretskii <eliz@HIDDEN> a =C3=A9crit:

> > Date: Wed, 17 Feb 2021 15:06:14 +0100
> > From: Fr=C3=A9d=C3=A9ric Baldit <frederic.baldit@HIDDEN>
> >=20
> > emacs -Q test.txt &
> >=20
> > 2) M-x whitespace-mode RET
> >=20
> > 3) type the following text (=C2=AB.=C2=BB for spacebar key):
> >=20
> > =C2=AB....First line of text in emacs=C2=BB, then type RET
> >=20
> > 4) DEL DEL to suppress backward two spaces on line 2, then type text
> > =C2=ABSecond one=C2=BB
> >=20
> > 5) M-2 M-b
> >=20
> > 6) TAB TAB TAB TAB: point should be at line 2, column 18, vertically
> > aligned with fourth word of line 1 (=C2=ABtext=C2=BB), but it is at col=
umn 26:
> > that's the bug. =20
>=20
> It's a known misfeature of whitespace-mode.  There's a comment in
> whitespace.el to that effect:
>=20
>     ;; WARNING: the mapping below has a problem.
>     ;; When a TAB occupies exactly one column, it will display the
>     ;; character ?\xBB at that column followed by a TAB which goes to
>     ;; the next TAB column.
>     ;; If this is a problem for you, please, comment the line below.
>     (tab-mark     ?\t    [?=C2=BB ?\t] [?\\ ?\t])	; tab - right
> guillemet
>=20
> You could customize whitespace-display-mappings to remove tab-mark
> from it, if you want to avoid this issue.
>=20
> > Rq1: what is curious (to me) is that deactivating whitespace-mode
> > removes abnormally inserted tab character (8 spaces) and everything
> > is OK. =20
>=20
> That's because disabling whitespace-mode deactivates the display-table
> mappings, which include the above mapping.
>=20
> > Rq2: I noted that with a different text, this behavior of
> > whitespace-mode disappears. For example, if one uses the following
> > first line of text:
> >=20
> > =C2=AB....This.is.a.first.line.of.text.with.a.few.words=C2=BB,
> >=20
> > then the result of typing TAB multiple times is as expected, with or
> > without whitespace-mode activated! =20
>=20
> Most probably because the "TAB occupies exactly one column" condition
> doesn't happen there.
>=20
> Thanks.

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> Date: Tue, 23 Feb 2021 15:05:47 +0100
> From: Frédéric Baldit <frederic.baldit@HIDDEN>
> Cc: 46590 <at> debbugs.gnu.org
> 
> I just began reading whitespace.el, in particular the use of the
> display table, which seems to be crucial here. But I'm just
> learning emacs (and emacs lisp), so there could be a long way
> before I can truly  (and deeply) understand whitespace.el code and see
> how to fix the bug.

I don't think this can be fixed without a complete redesign how a TAB
is displayed under this mode.  display-tables simply cannot deal with
such situations.  But I didn't think about this too long, so maybe I'm
missing something.

> I asked myself: should I contact the maintainer of whitespace.el
> (Vinicius Jose Latorre) to get some help?

I don't know, but what do you have to lose?

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 Content preview:  =?UTF-8?Q?Fr=C3=A9d=C3=A9ric?= Baldit <frederic.baldit@HIDDEN> writes: > 6) TAB
    TAB TAB TAB: point should be at line 2, column 18, vertically > aligned with
    fourth word of line 1 (=?UTF-8?Q?=C2=ABtext=C2=BB?=), but it is at column 26: > that's the bug.
    
 
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Fr=C3=A9d=C3=A9ric Baldit <frederic.baldit@HIDDEN> writes:

> 6) TAB TAB TAB TAB: point should be at line 2, column 18, vertically
> aligned with fourth word of line 1 (=C2=ABtext=C2=BB), but it is at colum=
n 26:
> that's the bug.

This is a duplicate of bug#18441 (and others), so I've now merged the
reports.

--=20
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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