bug#27895: 26.0.50; display-line-numbers and header-line-format alignment

bug#27895: 26.0.50; display-line-numbers and header-line-format alignment

[Mark Oteiza]

Hi,

Enabling display-line-numbers should affect how header-line-format is
shown.

From -Q:

1. M-x global-display-line-numbers-mode RET
2. M-x ruler-mode RET

Ruler mode uses the header line to show a word-processor-like ruler.
With line numbers shown, the header line is no longer aligned to the
buffer contents.  This is also apparent in C-x C-b or tabulated-list
derived modes where the titles aren't lined up to the corresponding
columns.


In GNU Emacs 26.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, Xaw scroll bars)
 of 2017-07-30 built on logos
Repository revision: d7825cb09eae438a83ed2f5b3e0715523d4ed5b7
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bug#27895: 26.0.50; display-line-numbers and header-line-format alignment

[Eli Zaretskii]

> From: Mark Oteiza <mvoteiza@udel.edu>
> Date: Mon, 31 Jul 2017 21:35:48 -0400
> 
> Enabling display-line-numbers should affect how header-line-format is
> shown.

I'm not sure I agree with this, not in this general form.  Modes use
header-line in different ways, and I don't think we can decide for all
of them up front how they should react to line numbers.

While I agree that tabulated-list modes and ruler-mode should indeed
be sensitive to line numbers, because the header-line in those modes
should align with the rest of buffer text, a counter-example is Info
mode, where indenting the header-line will IMO make the display look
uglier, almost buggy.

If people agree that the effect on header-line should be dependent on
the mode, then it follows that the fix should be in the modes, not in
the display engine.  Fixing tabulated-list-mode will fix all of its
descendants; ruler-mode will need a separate fix.  And likewise for
any other mode which reports a similar issue.

bug#27895: 26.0.50; display-line-numbers and header-line-format alignment

[Eli Zaretskii]

> Date: Tue, 01 Aug 2017 06:35:00 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 27895@debbugs.gnu.org
> 
> > From: Mark Oteiza <mvoteiza@udel.edu>
> > Date: Mon, 31 Jul 2017 21:35:48 -0400
> > 
> > Enabling display-line-numbers should affect how header-line-format is
> > shown.
> 
> I'm not sure I agree with this, not in this general form.  Modes use
> header-line in different ways, and I don't think we can decide for all
> of them up front how they should react to line numbers.
> 
> While I agree that tabulated-list modes and ruler-mode should indeed
> be sensitive to line numbers, because the header-line in those modes
> should align with the rest of buffer text, a counter-example is Info
> mode, where indenting the header-line will IMO make the display look
> uglier, almost buggy.
> 
> If people agree that the effect on header-line should be dependent on
> the mode, then it follows that the fix should be in the modes, not in
> the display engine.  Fixing tabulated-list-mode will fix all of its
> descendants; ruler-mode will need a separate fix.  And likewise for
> any other mode which reports a similar issue.

No further comments, so I've fixed tabulated-list-mode and ruler-mode
to be sensitive to display-line-numbers, and I'm boldly marking this
bug done.

Thanks.

bug#27895: 26.0.50; display-line-numbers and header-line-format alignment

[Mark Oteiza]

On 05/08/17 at 02:24pm, Eli Zaretskii wrote:
>> > From: Mark Oteiza <mvoteiza@udel.edu>
>> > Date: Mon, 31 Jul 2017 21:35:48 -0400
>> >
>> > Enabling display-line-numbers should affect how header-line-format is
>> > shown.
>>
>> I'm not sure I agree with this, not in this general form.  Modes use
>> header-line in different ways, and I don't think we can decide for all
>> of them up front how they should react to line numbers.
>>
>> While I agree that tabulated-list modes and ruler-mode should indeed
>> be sensitive to line numbers, because the header-line in those modes
>> should align with the rest of buffer text, a counter-example is Info
>> mode, where indenting the header-line will IMO make the display look
>> uglier, almost buggy.
>>
>> If people agree that the effect on header-line should be dependent on
>> the mode, then it follows that the fix should be in the modes, not in
>> the display engine.  Fixing tabulated-list-mode will fix all of its
>> descendants; ruler-mode will need a separate fix.  And likewise for
>> any other mode which reports a similar issue.
>
>No further comments, so I've fixed tabulated-list-mode and ruler-mode
>to be sensitive to display-line-numbers, and I'm boldly marking this
>bug done.

Thanks.  Info mode being an exception is fine I suppose, though I don't
agree that it would look buggy.

However, from -Q:

1. C-x C-b
2. M-x global-display-line-numbers-mode

The header line does not change until one does a revert-buffer in the
buffer list.  This doesn't look good to me.

bug#27895: 26.0.50; display-line-numbers and header-line-format alignment

[Eli Zaretskii]

> Date: Sun, 6 Aug 2017 16:25:43 -0400
> From: Mark Oteiza <mvoteiza@udel.edu>
> Cc: 27895-done@debbugs.gnu.org
> 
> 1. C-x C-b
> 2. M-x global-display-line-numbers-mode
> 
> The header line does not change until one does a revert-buffer in the
> buffer list.  This doesn't look good to me.

Thanks, fixed.

bug#27895: 26.0.50; display-line-numbers and header-line-format alignment

[Mark Oteiza]

On 12/08/17 at 12:47pm, Eli Zaretskii wrote:
>> Date: Sun, 6 Aug 2017 16:25:43 -0400
>> From: Mark Oteiza <mvoteiza@udel.edu>
>> Cc: 27895-done@debbugs.gnu.org
>>
>> 1. C-x C-b
>> 2. M-x global-display-line-numbers-mode
>>
>> The header line does not change until one does a revert-buffer in the
>> buffer list.  This doesn't look good to me.
>
>Thanks, fixed.

Thanks--found more breakage, however:

1. M-x global-display-line-numbers-mode
2. M-x list-packages

bug#27895: 26.0.50; display-line-numbers and header-line-format alignment

[Eli Zaretskii]

> Date: Sat, 12 Aug 2017 12:10:52 -0400
> From: Mark Oteiza <mvoteiza@udel.edu>
> Cc: 27895-done@debbugs.gnu.org
> 
> Thanks--found more breakage, however:
> 
> 1. M-x global-display-line-numbers-mode
> 2. M-x list-packages

How about fixing that?  It cannot be too hard, I think.