GNU bug report logs - #18441
whitespace-mode sometimes adds column to tab character

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Package: emacs; Severity: minor; Reported by: Mario Valencia <mariovalspi@HIDDEN>; Keywords: confirmed; dated Wed, 10 Sep 2014 06:56:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Marcin Borkowski <mbork@HIDDEN>
Subject: Re: bug#18441: whitespace-mode sometimes adds column to tab character
References: <CA+3HrJU3oy_1onXyt0rYvuSsadM5DdiUG3sB-gpw_d3QfO4GAA@HIDDEN>
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Date: Sat, 04 Sep 2021 09:57:33 +0200
In-Reply-To: <87a8myz9fq.fsf@HIDDEN> (Marcin Borkowski's message of "Thu, 18
 Feb 2016 09:53:13 +0100")
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 Content preview: Marcin Borkowski <mbork@HIDDEN> writes: >> well it appears
 to be a known problem, as commented in the source of >> whitespace-mode.
 I can confirm that this bug is still present in Emacs 28. 
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Marcin Borkowski <mbork@HIDDEN> writes:

>> well it appears to be a known problem, as commented in the source of
>> whitespace-mode.

I can confirm that this bug is still present in Emacs 28.

> To be more precise, the comment Mario meant is probably this part of
> definition of `whitespace-display-mappings':
>
>     ;; 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
>
> Does anyone know why the workaround given there is not turned on by
> default?  Or maybe it should be made a user option?

If that mark is removed, then tabs won't be marked specially at all --
only with a background colour, which is presumably not what people want
here...

Looking at the whitespace code, I don't really see any easy way to fix
this -- the buffer display table and tab actions don't match?

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




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#18441; Package emacs. Full text available.
Added tag(s) confirmed. Request was from Noam Postavsky <npostavs@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Severity set to 'minor' from 'normal' Request was from Noam Postavsky <npostavs@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Changed bug title to 'whitespace-mode sometimes adds column to tab character' from 'tab bug' Request was from Noam Postavsky <npostavs@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 18441 <at> debbugs.gnu.org:


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From: Marcin Borkowski <mbork@HIDDEN>
To: Mario Valencia <mariovalspi@HIDDEN>
Subject: Re: bug#18441: tab bug
References: <CA+3HrJU3oy_1onXyt0rYvuSsadM5DdiUG3sB-gpw_d3QfO4GAA@HIDDEN>
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On 2014-09-10, at 03:42, Mario Valencia <mariovalspi@HIDDEN> wrote:

> well it appears to be a known problem, as commented in the source of whit=
espace-mode.=20

To be more precise, the comment Mario meant is probably this part of
definition of `whitespace-display-mappings':

--8<---------------cut here---------------start------------->8---
    ;; 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
--8<---------------cut here---------------end--------------->8---

Does anyone know why the workaround given there is not turned on by
default?  Or maybe it should be made a user option?

Best,

--
mbork


> 2014-09-10 2:12 GMT-05:00 Mario Valencia <mariovalspi@HIDDEN>:
>
>
>  sorry, this happens in a text-mode buffer with whitespace-mode on. witho=
ut whitespace mode it only occupies one column.
>
>  2014-09-10 1:55 GMT-05:00 Mario Valencia <mariovalspi@HIDDEN>:
>
>
>  In a buffer, set tab-width to 6. then insert 5 characters, then a litera=
l tab character (C-q TAB). Now you have a 7 column tab.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#18441; Package emacs. Full text available.

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Subject: Re: tab bug
From: Mario Valencia <mariovalspi@HIDDEN>
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--001a1134d61ce897180502b132be
Content-Type: text/plain; charset=UTF-8

well it appears to be a known problem, as commented in the source of
whitespace-mode.

2014-09-10 2:12 GMT-05:00 Mario Valencia <mariovalspi@HIDDEN>:

> sorry, this happens in a text-mode buffer with whitespace-mode on. without
> whitespace mode it only occupies one column.
>
> 2014-09-10 1:55 GMT-05:00 Mario Valencia <mariovalspi@HIDDEN>:
>
>> In a buffer, set tab-width to 6. then insert 5 characters, then a literal
>> tab character (C-q TAB). Now you have a 7 column tab.
>>
>
>

--001a1134d61ce897180502b132be
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">well it appears to be a known problem, as commented in the=
 source of whitespace-mode.=C2=A0</div><div class=3D"gmail_extra"><br><div =
class=3D"gmail_quote">2014-09-10 2:12 GMT-05:00 Mario Valencia <span dir=3D=
"ltr">&lt;<a href=3D"mailto:mariovalspi@HIDDEN" target=3D"_blank">mariov=
alspi@HIDDEN</a>&gt;</span>:<br><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=
=3D"ltr">sorry, this happens in a text-mode buffer with whitespace-mode on.=
 without whitespace mode it only occupies one column.</div><div class=3D"gm=
ail_extra"><br><div class=3D"gmail_quote">2014-09-10 1:55 GMT-05:00 Mario V=
alencia <span dir=3D"ltr">&lt;<a href=3D"mailto:mariovalspi@HIDDEN" targ=
et=3D"_blank">mariovalspi@HIDDEN</a>&gt;</span>:<span class=3D""><br><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #=
ccc solid;padding-left:1ex"><div dir=3D"ltr">In a buffer, set tab-width to =
6. then insert 5 characters, then a literal tab character (C-q TAB). Now yo=
u have a 7 column tab.</div>
</blockquote></span></div><br></div>
</blockquote></div><br></div>

--001a1134d61ce897180502b132be--




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bug#18441; Package emacs. Full text available.

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Subject: Re: tab bug
From: Mario Valencia <mariovalspi@HIDDEN>
To: bug-gnu-emacs@HIDDEN
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--047d7bfd07767e61360502b0c777
Content-Type: text/plain; charset=UTF-8

sorry, this happens in a text-mode buffer with whitespace-mode on. without
whitespace mode it only occupies one column.

2014-09-10 1:55 GMT-05:00 Mario Valencia <mariovalspi@HIDDEN>:

> In a buffer, set tab-width to 6. then insert 5 characters, then a literal
> tab character (C-q TAB). Now you have a 7 column tab.
>

--047d7bfd07767e61360502b0c777
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">sorry, this happens in a text-mode buffer with whitespace-=
mode on. without whitespace mode it only occupies one column.</div><div cla=
ss=3D"gmail_extra"><br><div class=3D"gmail_quote">2014-09-10 1:55 GMT-05:00=
 Mario Valencia <span dir=3D"ltr">&lt;<a href=3D"mailto:mariovalspi@HIDDEN=
om" target=3D"_blank">mariovalspi@HIDDEN</a>&gt;</span>:<br><blockquote =
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid=
;padding-left:1ex"><div dir=3D"ltr">In a buffer, set tab-width to 6. then i=
nsert 5 characters, then a literal tab character (C-q TAB). Now you have a =
7 column tab.</div>
</blockquote></div><br></div>

--047d7bfd07767e61360502b0c777--




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#18441; Package emacs. Full text available.

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Subject: tab bug
From: Mario Valencia <mariovalspi@HIDDEN>
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--047d7bb04ace582ff60502b08ad1
Content-Type: text/plain; charset=UTF-8

In a buffer, set tab-width to 6. then insert 5 characters, then a literal
tab character (C-q TAB). Now you have a 7 column tab.

--047d7bb04ace582ff60502b08ad1
Content-Type: text/html; charset=UTF-8

<div dir="ltr">In a buffer, set tab-width to 6. then insert 5 characters, then a literal tab character (C-q TAB). Now you have a 7 column tab.</div>

--047d7bb04ace582ff60502b08ad1--




Acknowledgement sent to Mario Valencia <mariovalspi@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#18441; Package emacs. Full text available.
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