bug#72485: Support 'visual-wrap-prefix-mode' in SHR/EWW

[Jim Porter <jporterbugs@gmail.com>]

On 8/18/2024 11:12 AM, Eli Zaretskii wrote:
>   *** EWW now enables 'visual-wrap-prefix-mode' when 'shr-fill-text' is nil.
>   By default, 'shr-fill-text' is t, and EWW fills the text according to
>   the width of the window.  If you customize 'shr-fill-text' to nil,
>   EWW will now automatically turn on 'visual-wrap-prefix-mode' in
>   addition to 'visual-line-mode', so that long lines are wrapped at
>   word boundaries near window edge and the continuation lines are
>   indented using prefixes computed from surrounding context.

That seems good to me, so I'll just use that as-is for Emacs 31. How 
about this for the release branch?


*** New option 'shr-fill-text'.
When 'shr-fill-text' is non-nil (the default), SHR will fill the text
according to the width of the window.  If you customize it to nil, SHR
will leave the text as-is; in that case, EWW will automatically enable
'visual-line-mode' when displaying a page so that long lines are
visually wrapped at word boundaries.


(If you think this makes the Emacs 31 NEWS entry partially redundant, I 
can try to trim that one down to only discuss the new additions, but I 
don't mind either way.)