bug#4538: 23.1; kill-line doesn't with show-trailing-whitespace

bug#4538: 23.1; kill-line doesn't with show-trailing-whitespace

[andy.ling]

I've just updated from emacs 21.3 to 23.1 and I have found that kill-line 
behaves differently.

Run emacs -q
open a buffer and enter a line of spaces
go to the beginning of line and kill line (C-a C-k)
The line is deleted through the newline to the next line
Now execute (setq show-trailing-whitespace t)
Again enter a line of spaces and go to the beginning of the line.
This time the spaces should be hilighted in red.
Now kill the line. The line is only killed up to the newline.

This is different behaviour to emacs 21.3 and I don't believe it to be the 
intended behaviour.

Regards

Andy Ling





In GNU Emacs 23.1.1 (i386-mingw-nt5.1.2600)
 of 2009-07-30 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4)'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ENG
  value of $XMODIFIERS: nil
  locale-coding-system: cp1252
  default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> C-x C-f ~ / x x x x <return> <return> <return> 
<return> <up> <up> <up> ( s e t q SPC s h o w - t r 
a i l i n g - w h i t e s p a c e SPC t ) C-x C-e <return> 
SPC SPC SPC SPC SPC SPC SPC C-a C-k <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <menu-bar> <help-menu> 
<send-emacs-bug-report>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
t


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bug#4538: 23.1; kill-line doesn't with show-trailing-whitespace

[Glenn Morris]

andy.ling@quantel.com wrote:

> Run emacs -q
> open a buffer and enter a line of spaces
> go to the beginning of line and kill line (C-a C-k)
> The line is deleted through the newline to the next line
> Now execute (setq show-trailing-whitespace t)
> Again enter a line of spaces and go to the beginning of the line.
> This time the spaces should be hilighted in red.
> Now kill the line. The line is only killed up to the newline.

It seems this is deliberate:

http://lists.gnu.org/archive/html/emacs-devel/2004-02/msg00190.html

At first glance, it does seem a bit odd. It is also undocumented.

bug#4538: 23.1; kill-line doesn't with show-trailing-whitespace

[andy.ling]

Glenn Morris <rgm@gnu.org> wrote on 24/09/2009 04:28:41:

> andy.ling@quantel.com wrote:
> 
> > Run emacs -q
> > open a buffer and enter a line of spaces
> > go to the beginning of line and kill line (C-a C-k)
> > The line is deleted through the newline to the next line
> > Now execute (setq show-trailing-whitespace t)
> > Again enter a line of spaces and go to the beginning of the line.
> > This time the spaces should be hilighted in red.
> > Now kill the line. The line is only killed up to the newline.
> 
> It seems this is deliberate:
> 
> http://lists.gnu.org/archive/html/emacs-devel/2004-02/msg00190.html
> 
> At first glance, it does seem a bit odd. It is also undocumented.
> 

I'd say it seems odd at second glance too :-)

I can't believe everybody wants this behaviour. So to that end
can I suggest the traditional emacs approach is adopted and
it is made configurable.

Regards

Andy Ling



-- 

Quantel is the trade name used by Quantel Holdings Limited and its 
subsidiaries.  Quantel Holdings Limited is registered in England & Wales. 
Registration No: 4004913 
Contact details for all Quantel Offices and Companies can be found on our 
website www.quantel.com or by writing to the holding company.
Registered address: Turnpike Road, Newbury, Berkshire, RG14 2NX, United 
Kingdom 

bug#4538: 23.1; kill-line doesn't with show-trailing-whitespace

[Glenn Morris]

andy.ling@quantel.com wrote:

> I can't believe everybody wants this behaviour. So to that end can I
> suggest the traditional emacs approach is adopted and it is made
> configurable.

Yes, but there shouldn't be options for absolutely everything.
The current behaviour makes no sense at all to me.
Let's see if anyone else has anything to say on this matter...

bug#4538: 23.1; kill-line doesn't with show-trailing-whitespace

[andy.ling]

Glenn Morris <rgm@gnu.org> wrote on 25/09/2009 07:17:39:

> andy.ling@quantel.com wrote:
> 
> > I can't believe everybody wants this behaviour. So to that end can I
> > suggest the traditional emacs approach is adopted and it is made
> > configurable.
> 
> Yes, but there shouldn't be options for absolutely everything.

True, but as at least one person wanted this behaviour and RMS
seemed to support it. So I thought it might be easier than going
back to the old behaviour.

> The current behaviour makes no sense at all to me.

I agree. Add my vote to the list.

> Let's see if anyone else has anything to say on this matter...
> 

I'll leave it in your hands and await the outcome then.

Thanks

Andy Ling


-- 

Quantel is the trade name used by Quantel Holdings Limited and its 
subsidiaries.  Quantel Holdings Limited is registered in England & Wales. 
Registration No: 4004913 
Contact details for all Quantel Offices and Companies can be found on our 
website www.quantel.com or by writing to the holding company.
Registered address: Turnpike Road, Newbury, Berkshire, RG14 2NX, United 
Kingdom 

bug#4538: 23.1; kill-line doesn't with show-trailing-whitespace

[Lars Magne Ingebrigtsen]

Glenn Morris <rgm@gnu.org> writes:

>> open a buffer and enter a line of spaces
>> go to the beginning of line and kill line (C-a C-k)
>> The line is deleted through the newline to the next line
>> Now execute (setq show-trailing-whitespace t)
>> Again enter a line of spaces and go to the beginning of the line.
>> This time the spaces should be hilighted in red.
>> Now kill the line. The line is only killed up to the newline.
>
> It seems this is deliberate:
>
> http://lists.gnu.org/archive/html/emacs-devel/2004-02/msg00190.html
>
> At first glance, it does seem a bit odd. It is also undocumented.

It seems odd, but it makes a bit of sense.  `C-k' works differently when
there is visible text on the current line and when there's not.  That's
(somewhat) consistent.

So my feeling is that this should just be documented.

The current doc string says:

---
Kill the rest of the current line; if no nonblanks there, kill thru newline.
---

I think this should just be amended to say "visible nonblanks" and point
to `show-trailing-whitespace'.

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

bug#4538: 23.1; kill-line doesn't with show-trailing-whitespace

[Glenn Morris]

Lars Magne Ingebrigtsen wrote:

> It seems odd, but it makes a bit of sense.  `C-k' works differently when
> there is visible text on the current line and when there's not.  That's
> (somewhat) consistent.

Oh, OK, I guess I see.

> So my feeling is that this should just be documented.
>
> The current doc string says:
>
> ---
> Kill the rest of the current line; if no nonblanks there, kill thru newline.
> ---
>
> I think this should just be amended to say "visible nonblanks" and point
> to `show-trailing-whitespace'.

bug#4538: 23.1; kill-line doesn't with show-trailing-whitespace

[Lars Magne Ingebrigtsen]

Glenn Morris <rgm@gnu.org> writes:

>> It seems odd, but it makes a bit of sense.  `C-k' works differently when
>> there is visible text on the current line and when there's not.  That's
>> (somewhat) consistent.
>
> Oh, OK, I guess I see.

I've now updated the doc string, so I'm closing this report.

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