* bug#18441: tab bug
@ 2014-09-10 6:55 Mario Valencia
2014-09-10 7:12 ` Mario Valencia
0 siblings, 1 reply; 6+ messages in thread
From: Mario Valencia @ 2014-09-10 6:55 UTC (permalink / raw)
To: 18441
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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.
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^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18441: tab bug
2014-09-10 6:55 bug#18441: tab bug Mario Valencia
@ 2014-09-10 7:12 ` Mario Valencia
2014-09-10 7:42 ` Mario Valencia
0 siblings, 1 reply; 6+ messages in thread
From: Mario Valencia @ 2014-09-10 7:12 UTC (permalink / raw)
To: 18441
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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@gmail.com>:
> 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.
>
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^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18441: tab bug
2014-09-10 7:12 ` Mario Valencia
@ 2014-09-10 7:42 ` Mario Valencia
2016-02-18 8:53 ` Marcin Borkowski
0 siblings, 1 reply; 6+ messages in thread
From: Mario Valencia @ 2014-09-10 7:42 UTC (permalink / raw)
To: 18441
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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@gmail.com>:
> 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@gmail.com>:
>
>> 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.
>>
>
>
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^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18441: tab bug
2014-09-10 7:42 ` Mario Valencia
@ 2016-02-18 8:53 ` Marcin Borkowski
2021-09-04 7:57 ` bug#18441: whitespace-mode sometimes adds column to tab character Lars Ingebrigtsen
0 siblings, 1 reply; 6+ messages in thread
From: Marcin Borkowski @ 2016-02-18 8:53 UTC (permalink / raw)
To: Mario Valencia; +Cc: 18441
On 2014-09-10, at 03:42, Mario Valencia <mariovalspi@gmail.com> wrote:
> well it appears to be a known problem, as commented in the source of whitespace-mode.
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 [?» ?\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@gmail.com>:
>
>
> 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@gmail.com>:
>
>
> 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.
^ permalink raw reply [flat|nested] 6+ messages in thread* bug#18441: whitespace-mode sometimes adds column to tab character
2016-02-18 8:53 ` Marcin Borkowski
@ 2021-09-04 7:57 ` Lars Ingebrigtsen
2022-05-02 9:48 ` Lars Ingebrigtsen
0 siblings, 1 reply; 6+ messages in thread
From: Lars Ingebrigtsen @ 2021-09-04 7:57 UTC (permalink / raw)
To: Marcin Borkowski; +Cc: Mario Valencia, 18441
Marcin Borkowski <mbork@mbork.pl> 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 [?» ?\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?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2022-05-02 9:48 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-09-10 6:55 bug#18441: tab bug Mario Valencia
2014-09-10 7:12 ` Mario Valencia
2014-09-10 7:42 ` Mario Valencia
2016-02-18 8:53 ` Marcin Borkowski
2021-09-04 7:57 ` bug#18441: whitespace-mode sometimes adds column to tab character Lars Ingebrigtsen
2022-05-02 9:48 ` Lars Ingebrigtsen
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