GNU bug report logs - #48211
28.0.50; eww strips whitespace between <mark> elements

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Package: emacs; Reported by: Stefan Kangas <stefan@HIDDEN>; Done: Lars Ingebrigtsen <larsi@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Subject: Re: bug#48211: 28.0.50; eww strips whitespace between <mark> elements
To: "Basil L. Contovounesios" <contovob@HIDDEN>
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> I guess this is a bug in libxml2, so I reported it here:
>
>     https://gitlab.gnome.org/GNOME/libxml2/-/issues/247

Upstream says that this is fixed in 2.14:

https://gitlab.gnome.org/GNOME/libxml2/-/issues/247#note_2418422
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#48211; Package emacs. Full text available.
bug unarchived. Request was from Stefan Kangas <stefankangas@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
bug archived. Request was from Debbugs Internal Request <help-debbugs@HIDDEN> to internal_control <at> debbugs.gnu.org. Full text available.
bug marked as fixed in version 29.1, send any further explanations to 48211 <at> debbugs.gnu.org and Stefan Kangas <stefan@HIDDEN> Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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To: Stefan Kangas <stefan@HIDDEN>
Subject: Re: bug#48211: 28.0.50; eww strips whitespace between <mark> elements
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Stefan Kangas <stefan@HIDDEN> writes:

> I guess this is a bug in libxml2, so I reported it here:
>
>     https://gitlab.gnome.org/GNOME/libxml2/-/issues/247

[...]

> +(defun shr-tag-mark (dom)
> +  (shr-generic dom)
> +  ;; Hack to work around bug in libxml2 (Bug#48211):
> +  ;; https://gitlab.gnome.org/GNOME/libxml2/-/issues/247
> +  (insert " "))

I've now pushed a variation of this to Emacs 29, and included a face and
stuff, as

https://www.w3schools.com/tags/tag_mark.asp

recommends.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#48211; Package emacs. Full text available.

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Subject: Re: bug#48211: 28.0.50; eww strips whitespace between <mark> elements
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Stefan Kangas <stefan@HIDDEN> writes:

> FWIW, the below diff works around this bug for me.
>
> diff --git a/lisp/net/shr.el b/lisp/net/shr.el
> index cbdeb65ba8..3eb3a5bc49 100644
> --- a/lisp/net/shr.el
> +++ b/lisp/net/shr.el
> @@ -1485,6 +1485,12 @@ shr-tag-tt
>    ;; The `tt' tag is deprecated in favor of `code'.
>    (shr-tag-code dom))
>
> +(defun shr-tag-mark (dom)
> +  (shr-generic dom)
> +  ;; Hack to work around bug in libxml2 (Bug#48211):
> +  ;; https://gitlab.gnome.org/GNOME/libxml2/-/issues/247
> +  (insert " "))
> +
>  (defun shr-tag-ins (cont)
>    (let* ((start (point))
>           (color "green")

Well, I should moderate that statement.

It doesn't exactly fix the bug as I'm now getting this instead:

    1. f. Unidad ling=C3=BC=C3=ADstica , dotada generalmente de significado=
 , que
    se separa de las dem=C3=A1s mediante pausas potenciales en la
    pronunciaci=C3=B3n y blancos en la escritura .

    2. f. Representaci=C3=B3n gr=C3=A1fica de la palabra hablada .

    3. f. Facultad de hablar .

IOW, whitespace is added even if the following character is
punctuation...
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#48211; Package emacs. Full text available.

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From: Stefan Kangas <stefan@HIDDEN>
In-Reply-To: <87y2cvl6eg.fsf@HIDDEN> (Basil L. Contovounesios's message of
 "Tue, 04 May 2021 00:55:03 +0100")
References: <CADwFkm=vB2qufHVC0Q+_RMeDDC=YbgTBbs474jKO0ECY888YTA@HIDDEN>
 <87y2cvl6eg.fsf@HIDDEN>
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Message-ID: <CADwFkmkKmqjbLuEQNJD+Z7Q8CFgc2Oia+YUEkPXgSZ7rFx5_ag@HIDDEN>
Subject: Re: bug#48211: 28.0.50; eww strips whitespace between <mark> elements
To: "Basil L. Contovounesios" <contovob@HIDDEN>
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"Basil L. Contovounesios" <contovob@HIDDEN> writes:

> I think this is because libxml-parse-html-region specifies
> HTML_PARSE_NOBLANKS:
>
> Return CDATA sections (like <style>foo</style>) as text nodes.
> 3c2317e891 2010-12-06 17:59:52 +0100
> https://git.sv.gnu.org/cgit/emacs.git/commit/?id=3c2317e89100833812a7194c0d9d39ae0f52cb33

Hmm, okay.  For now, I'm seeing this issue with basically any tag that
libxml2 does not already know about, e.g. "<summary>" or "<bdi>".

This is what I came up with before reading Basil's reply:

(with-temp-buffer
  (insert "<p><tt>foo</tt> <tt>bar</tt></p>")
  (libxml-parse-html-region (point-min) (point-max)))

=> (html nil (body nil (p nil (tt nil "foo") " " (tt nil "bar"))))

(with-temp-buffer
  (insert "<p><mark>foo</mark> <mark>bar</mark></p>")
  (libxml-parse-html-region (point-min) (point-max)))

=> (html nil (body nil (p nil (mark nil "foo") (mark nil "bar"))))

I guess this is a bug in libxml2, so I reported it here:

    https://gitlab.gnome.org/GNOME/libxml2/-/issues/247

FWIW, the below diff works around this bug for me.

diff --git a/lisp/net/shr.el b/lisp/net/shr.el
index cbdeb65ba8..3eb3a5bc49 100644
--- a/lisp/net/shr.el
+++ b/lisp/net/shr.el
@@ -1485,6 +1485,12 @@ shr-tag-tt
   ;; The `tt' tag is deprecated in favor of `code'.
   (shr-tag-code dom))

+(defun shr-tag-mark (dom)
+  (shr-generic dom)
+  ;; Hack to work around bug in libxml2 (Bug#48211):
+  ;; https://gitlab.gnome.org/GNOME/libxml2/-/issues/247
+  (insert " "))
+
 (defun shr-tag-ins (cont)
   (let* ((start (point))
          (color "green")
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#48211; Package emacs. Full text available.
bug Marked as found in versions 24.1. Request was from "Basil L. Contovounesios" <contovob@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 48211 <at> debbugs.gnu.org:


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From: "Basil L. Contovounesios" <contovob@HIDDEN>
To: Stefan Kangas <stefan@HIDDEN>
Subject: Re: bug#48211: 28.0.50; eww strips whitespace between <mark> elements
References: <CADwFkm=vB2qufHVC0Q+_RMeDDC=YbgTBbs474jKO0ECY888YTA@HIDDEN>
Date: Tue, 04 May 2021 00:55:03 +0100
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found 48211 24.1
quit

Stefan Kangas <stefan@HIDDEN> writes:

> Opening a HTML file in eww with <mark> elements strips whitespace
> between elements.

I think this is because libxml-parse-html-region specifies
HTML_PARSE_NOBLANKS:

Return CDATA sections (like <style>foo</style>) as text nodes.
3c2317e891 2010-12-06 17:59:52 +0100
https://git.sv.gnu.org/cgit/emacs.git/commit/?id=3c2317e89100833812a7194c0d9d39ae0f52cb33

-- 
Basil
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#48211; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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Subject: 28.0.50; eww strips whitespace between <mark> elements
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Opening a HTML file in eww with <mark> elements strips whitespace
between elements.

Steps to reproduce:

0. echo "<p><mark>foo</mark> <mark>bar</mark></p>" > /tmp/foo.html
1. emacs -Q
2. M-x eww RET file:///tmp/foo.html RET

Result is that I see, in the eww buffer:

    "foobar"

Expected result is:

    "foo bar"

For a real world example where this matters, see:

    https://dle.rae.es/palabra

In eww, I get:

  1. f. Unidadling=C3=BC=C3=ADstica, dotadageneralmentedesignificado,
  queseseparadelasdem=C3=A1smediantepausaspotencialesenlapronunciaci=C3=B3n=
yblancosenlaescritura.

In Firefox, I get:

  1. f. Unidad ling=C3=BC=C3=ADstica, dotada generalmente de significado, q=
ue se
  separa de las dem=C3=A1s mediante pausas potenciales en la pronunciaci=C3=
=B3n y
  blancos en la escritura.
Acknowledgement sent to Stefan Kangas <stefan@HIDDEN>:
New bug report received and forwarded. Copy sent to larsi@HIDDEN, bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to larsi@HIDDEN, bug-gnu-emacs@HIDDEN:
bug#48211; Package emacs. Full text available.
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