bug#66599: 29.1; Visual line mode behaves strangely on line with contiguous stretch of whitespace

bug#66599: 29.1; Visual line mode behaves strangely on line with contiguous stretch of whitespace

[Rahguzar via Bug reports for GNU Emacs, the Swiss army knife of text editors]

[-- Attachment #1: Type: text/plain, Size: 14229 bytes --]


Dear Emacs maintainers,
 Starting with emacs -Q
 Paste the following lines two lines in the buffer,
sage: V = VectorSpace(RationalField(), 3)                                       # optional - sage.modules
sage: v = V.gen(1)                                                              # optional - sage.modules

Now shrink the window so that these lines cannot fit on one screen line.
When this happens Emacs wraps lines strangely. It doesn't break the
contiguous stretch of whitespace instead it breaks the word preceding
it. I have attached a screenshot of what I see with this email.


In GNU Emacs 29.1 (build 1, x86_64-suse-linux-gnu, GTK+ Version 3.24.38,
 cairo version 1.18.0) of 2023-10-08 built on i02-ch2a
System Description: openSUSE Tumbleweed

Configured using:
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bug#66599: 29.1; Visual line mode behaves strangely on line with contiguous stretch of whitespace

[Eli Zaretskii]

tags 66599 notabug
thanks

> Date: Tue, 17 Oct 2023 22:10:43 +0200
> From:  Rahguzar via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Dear Emacs maintainers,
>  Starting with emacs -Q
>  Paste the following lines two lines in the buffer,
> sage: V = VectorSpace(RationalField(), 3)                                       # optional - sage.modules
> sage: v = V.gen(1)                                                              # optional - sage.modules
> 
> Now shrink the window so that these lines cannot fit on one screen line.
> When this happens Emacs wraps lines strangely. It doesn't break the
> contiguous stretch of whitespace instead it breaks the word preceding
> it. I have attached a screenshot of what I see with this email.

This is the expected behavior.  Visual line mode never breaks the line
in the middle of a stretch of whitespace characters, it always breaks
the line at a non-whitespace character _after_ a stretch of whitespace
characters.

This is not a bug.

bug#66599: 29.1; Visual line mode behaves strangely on line with contiguous stretch of whitespace

[Rahguzar via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Hi Eli,

Eli Zaretskii <eliz@gnu.org> writes:

> tags 66599 notabug
> thanks
>
> This is the expected behavior.  Visual line mode never breaks the line
> in the middle of a stretch of whitespace characters, it always breaks
> the line at a non-whitespace character _after_ a stretch of whitespace
> characters.
>
> This is not a bug.

Thanks for clarifying. Is there a way to get a behavior which
prioritizes not breaking on non-whitespace characters?

Rahguzar

bug#66599: 29.1; Visual line mode behaves strangely on line with contiguous stretch of whitespace

[Eli Zaretskii]

> From: Rahguzar <rahguzar@zohomail.eu>
> Cc: 66599@debbugs.gnu.org
> Date: Thu, 19 Oct 2023 11:59:56 +0200
> 
> > This is the expected behavior.  Visual line mode never breaks the line
> > in the middle of a stretch of whitespace characters, it always breaks
> > the line at a non-whitespace character _after_ a stretch of whitespace
> > characters.
> >
> > This is not a bug.
> 
> Thanks for clarifying. Is there a way to get a behavior which
> prioritizes not breaking on non-whitespace characters?

Not that I know of, no.  The word-wrap feature of visual line mode is
implemented in C, and the intent there is quite clear.

bug#66599: 29.1; Visual line mode behaves strangely on line with contiguous stretch of whitespace

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

> tags 66599 notabug
> thanks
>
>> Date: Tue, 17 Oct 2023 22:10:43 +0200
>> From:  Rahguzar via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>>
>> Dear Emacs maintainers,
>>  Starting with emacs -Q
>>  Paste the following lines two lines in the buffer,
>> sage: V = VectorSpace(RationalField(), 3)                                       # optional - sage.modules
>> sage: v = V.gen(1)                                                              # optional - sage.modules
>>
>> Now shrink the window so that these lines cannot fit on one screen line.
>> When this happens Emacs wraps lines strangely. It doesn't break the
>> contiguous stretch of whitespace instead it breaks the word preceding
>> it. I have attached a screenshot of what I see with this email.
>
> This is the expected behavior.  Visual line mode never breaks the line
> in the middle of a stretch of whitespace characters, it always breaks
> the line at a non-whitespace character _after_ a stretch of whitespace
> characters.
>
> This is not a bug.

I'm therefore closing this bug report.