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* bug#61239: 30.0.50; Display property value `((space :align-to))` doesn't handle line numbers
@ 2023-02-02 21:26 Narendra Joshi
  2023-02-03  8:54 ` Eli Zaretskii
  0 siblings, 1 reply; 4+ messages in thread
From: Narendra Joshi @ 2023-02-02 21:26 UTC (permalink / raw)
  To: 61239


The following code demonstrates the behavior:

(display-line-numbers-mode +1)
(setq header-line-format
      (concat (propertize " " 'display '((space :align-to 0))) "Column"))

With line numbers displayed, the text above, i.e. "Column" doesn't align
wit the text in the buffer. This is problematic for modes like SES mode
(https://www.gnu.org/software/emacs/manual/html_node/ses/index.html).      


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.36, cairo version 1.17.6) of 2023-01-21 built on derhulk
Repository revision: ca8f5f71f412f29d52da0bdb8ac196d298b3b0d3
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12014000
System Description: Fedora Linux 37 (Workstation Edition)

Configured using:
 'configure --prefix /home/narendraj9/.local/ --with-native-compilation
 --with-imagemagick --with-json'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
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Major mode: Lisp Interaction

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Memory information:
((conses 16 1303151 246368)
 (symbols 48 81870 9)
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Best regards,
-- 
Narendra Joshi





^ permalink raw reply	[flat|nested] 4+ messages in thread

* bug#61239: 30.0.50; Display property value `((space :align-to))` doesn't handle line numbers
  2023-02-02 21:26 bug#61239: 30.0.50; Display property value `((space :align-to))` doesn't handle line numbers Narendra Joshi
@ 2023-02-03  8:54 ` Eli Zaretskii
  2023-02-03 10:08   ` Narendra Joshi
  2023-02-03 14:48   ` Eli Zaretskii
  0 siblings, 2 replies; 4+ messages in thread
From: Eli Zaretskii @ 2023-02-03  8:54 UTC (permalink / raw)
  To: Narendra Joshi; +Cc: 61239

tags 61239 notabug wontfix
thanks

> From: Narendra Joshi <narendraj9@gmail.com>
> Date: Thu, 02 Feb 2023 22:26:57 +0100
> 
> 
> The following code demonstrates the behavior:
> 
> (display-line-numbers-mode +1)
> (setq header-line-format
>       (concat (propertize " " 'display '((space :align-to 0))) "Column"))
> 
> With line numbers displayed, the text above, i.e. "Column" doesn't align
> wit the text in the buffer. This is problematic for modes like SES mode
> (https://www.gnu.org/software/emacs/manual/html_node/ses/index.html).      

The :align-to values in header-line and mode-line do not automatically
account for line numbers when display-line-numbers-mode is turned on.
This is because the display engine cannot possibly know whether the
application does or doesn't want this; we certainly don't want that
for mode-line, for example.  For header lines, there's no guarantee
that the text there must align with the buffer text: that is up to the
application to decide.

So if a Lisp program wants the header-line indentation to be updated
according to the screen estate taken by line numbers, it should do the
following:

  . turn on the minor mode header-line-indent-mode
  . include header-line-indent-width in the :align-to expression

In your case, the following change in the :align-to should do what you
want:

  (setq header-line-format
        (concat (propertize " "
                            'display
                            '(space :align-to
                                    (+ header-line-indent-width 0)))
                "Column"))

You can see further examples of using this in tabulated-list-mode.el.

I see that the ELisp manual doesn't mention this minor mode, and
moreover, has some text which might mislead you into thinking that the
header-line display will automatically be updated to account for the
line numbers; I will fix the manual soon.





^ permalink raw reply	[flat|nested] 4+ messages in thread

* bug#61239: 30.0.50; Display property value `((space :align-to))` doesn't handle line numbers
  2023-02-03  8:54 ` Eli Zaretskii
@ 2023-02-03 10:08   ` Narendra Joshi
  2023-02-03 14:48   ` Eli Zaretskii
  1 sibling, 0 replies; 4+ messages in thread
From: Narendra Joshi @ 2023-02-03 10:08 UTC (permalink / raw)
  To: Eli Zaretskii; +Cc: 61239

[-- Attachment #1: Type: text/plain, Size: 2087 bytes --]

Thank a lot for the explanation :)

Best,
Narendra

On Fri, Feb 3, 2023, 09:54 Eli Zaretskii <eliz@gnu.org> wrote:

> tags 61239 notabug wontfix
> thanks
>
> > From: Narendra Joshi <narendraj9@gmail.com>
> > Date: Thu, 02 Feb 2023 22:26:57 +0100
> >
> >
> > The following code demonstrates the behavior:
> >
> > (display-line-numbers-mode +1)
> > (setq header-line-format
> >       (concat (propertize " " 'display '((space :align-to 0))) "Column"))
> >
> > With line numbers displayed, the text above, i.e. "Column" doesn't align
> > wit the text in the buffer. This is problematic for modes like SES mode
> > (https://www.gnu.org/software/emacs/manual/html_node/ses/index.html).
>
>
> The :align-to values in header-line and mode-line do not automatically
> account for line numbers when display-line-numbers-mode is turned on.
> This is because the display engine cannot possibly know whether the
> application does or doesn't want this; we certainly don't want that
> for mode-line, for example.  For header lines, there's no guarantee
> that the text there must align with the buffer text: that is up to the
> application to decide.
>
> So if a Lisp program wants the header-line indentation to be updated
> according to the screen estate taken by line numbers, it should do the
> following:
>
>   . turn on the minor mode header-line-indent-mode
>   . include header-line-indent-width in the :align-to expression
>
> In your case, the following change in the :align-to should do what you
> want:
>
>   (setq header-line-format
>         (concat (propertize " "
>                             'display
>                             '(space :align-to
>                                     (+ header-line-indent-width 0)))
>                 "Column"))
>
> You can see further examples of using this in tabulated-list-mode.el.
>
> I see that the ELisp manual doesn't mention this minor mode, and
> moreover, has some text which might mislead you into thinking that the
> header-line display will automatically be updated to account for the
> line numbers; I will fix the manual soon.
>

[-- Attachment #2: Type: text/html, Size: 2968 bytes --]

^ permalink raw reply	[flat|nested] 4+ messages in thread

* bug#61239: 30.0.50; Display property value `((space :align-to))` doesn't handle line numbers
  2023-02-03  8:54 ` Eli Zaretskii
  2023-02-03 10:08   ` Narendra Joshi
@ 2023-02-03 14:48   ` Eli Zaretskii
  1 sibling, 0 replies; 4+ messages in thread
From: Eli Zaretskii @ 2023-02-03 14:48 UTC (permalink / raw)
  To: narendraj9; +Cc: 61239-done

> Cc: 61239@debbugs.gnu.org
> Date: Fri, 03 Feb 2023 10:54:35 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> 
> I see that the ELisp manual doesn't mention this minor mode, and
> moreover, has some text which might mislead you into thinking that the
> header-line display will automatically be updated to account for the
> line numbers; I will fix the manual soon.

Now done.

And with that I'm closing this bug.  Thanks for bringing this to our
attention.





^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2023-02-03 14:48 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-02-02 21:26 bug#61239: 30.0.50; Display property value `((space :align-to))` doesn't handle line numbers Narendra Joshi
2023-02-03  8:54 ` Eli Zaretskii
2023-02-03 10:08   ` Narendra Joshi
2023-02-03 14:48   ` Eli Zaretskii

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