GNU bug report logs - #31149
27.0.50; (gui-get-selection nil 'text/html) returns mis-decoded text

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; (gui-get-selection nil 'text/html) returns mis-decoded text
Date: Fri, 13 Apr 2018 16:55:26 -0400

Package: Emacs
Version: 27.0.50


(gui-get-selection nil 'text/html)

returns utf-16 text when the primary selection is owned by Mozilla, but
we decode it as latin-1 instead, so it looks like garbage.

I don't know why we're getting utf-16.  Is that what standards say it
should do?  If so, we should adjust our code (which currently knows
nothing about the `text/html` target-type).

As for why we decode it as latin-1, it's (under GNU/Linux; Lars may be
using something else because he's getting something with a `charset`
property which I don't get here) because:
- selection_data_to_lisp_data (in xselect.c) makes a unibyte string with
  the property `foreign-selection` set to `STRING` when the actual
  string type is not known (as opposed to COMPOUND-TEXT and
  UTF8-STRING, basically).
- in gui-get-selection we then have a mapping from `STRING` to
  `iso-8859-1` (which is apparently the right thing for the official
  `STRING` target-type in X11).

I can't figure out if/where these kinds of things about the X11
selection protocol is described, but at least in `xclip` they have
a hack specifically for this case:

    [...]
    if (html != None && sel_type == html) {
	/* if the buffer contains UCS-2 (UTF-16), convert to
	 * UTF-8.  Mozilla-based browsers do this for the
	 * text/html target.
	 */
    [...]

and according to the subsequent code it's not even always the
same endianness.

I don't know what is the difference between the `target-type` passed to
x-get-selection-internal and the `foreign-selection` property we get on
the returned string (they seem to be the same in my tests, except when
the type is not one of the known ones, and where we then force
`foreign-selection` to be `STRING`).


        Stefan



In GNU Emacs 27.0.50 (build 1, i686-pc-linux-gnu, GTK+ Version 2.24.32)
 of 2018-03-23 built on ceviche
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Message #8 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 31149 <at> debbugs.gnu.org
Subject: Re: bug#31149: 27.0.50;
 (gui-get-selection nil 'text/html) returns mis-decoded text
Date: Fri, 13 Apr 2018 23:05:34 +0200

Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes:

> As for why we decode it as latin-1, it's (under GNU/Linux; Lars may be
> using something else because he's getting something with a `charset`
> property which I don't get here) because:

I'm also running under GNU/Linux -- it's the latest Debian (9, which
is...  stretch?), but not with Gnome.  Instead I'm using xfce -- I guess
Gnome could get involved with the selection stuff somehow.

Another data point: If I select some HTML in Chromium,
(gui-get-selection nil 'text/html) returns nil.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #11 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>, Kenichi Handa <handa <at> gnu.org>
Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org
Subject: Re: bug#31149: 27.0.50;
 (gui-get-selection nil 'text/html) returns mis-decoded text
Date: Sat, 14 Apr 2018 09:32:41 +0300

> From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
> Date: Fri, 13 Apr 2018 16:55:26 -0400
> Cc: Lars Ingebrigtsen <larsi <at> gnus.org>
> 
> (gui-get-selection nil 'text/html)
> 
> returns utf-16 text when the primary selection is owned by Mozilla, but
> we decode it as latin-1 instead, so it looks like garbage.
> 
> I don't know why we're getting utf-16.  Is that what standards say it
> should do?  If so, we should adjust our code (which currently knows
> nothing about the `text/html` target-type).
> 
> As for why we decode it as latin-1, it's (under GNU/Linux; Lars may be
> using something else because he's getting something with a `charset`
> property which I don't get here) because:
> - selection_data_to_lisp_data (in xselect.c) makes a unibyte string with
>   the property `foreign-selection` set to `STRING` when the actual
>   string type is not known (as opposed to COMPOUND-TEXT and
>   UTF8-STRING, basically).
> - in gui-get-selection we then have a mapping from `STRING` to
>   `iso-8859-1` (which is apparently the right thing for the official
>   `STRING` target-type in X11).
> 
> I can't figure out if/where these kinds of things about the X11
> selection protocol is described, but at least in `xclip` they have
> a hack specifically for this case:
> 
>     [...]
>     if (html != None && sel_type == html) {
> 	/* if the buffer contains UCS-2 (UTF-16), convert to
> 	 * UTF-8.  Mozilla-based browsers do this for the
> 	 * text/html target.
> 	 */
>     [...]
> 
> and according to the subsequent code it's not even always the
> same endianness.
> 
> I don't know what is the difference between the `target-type` passed to
> x-get-selection-internal and the `foreign-selection` property we get on
> the returned string (they seem to be the same in my tests, except when
> the type is not one of the known ones, and where we then force
> `foreign-selection` to be `STRING`).

I Hope Handa-san (CC'ed) could comment on this.

Message #14 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Kenichi Handa <handa <at> gnu.org>
Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
Subject: Re: bug#31149: 27.0.50;
 (gui-get-selection nil 'text/html) returns mis-decoded text
Date: Tue, 24 Apr 2018 21:11:10 +0300

Ping!

> Date: Sat, 14 Apr 2018 09:32:41 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org
> 
> > From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
> > Date: Fri, 13 Apr 2018 16:55:26 -0400
> > Cc: Lars Ingebrigtsen <larsi <at> gnus.org>
> > 
> > (gui-get-selection nil 'text/html)
> > 
> > returns utf-16 text when the primary selection is owned by Mozilla, but
> > we decode it as latin-1 instead, so it looks like garbage.
> > 
> > I don't know why we're getting utf-16.  Is that what standards say it
> > should do?  If so, we should adjust our code (which currently knows
> > nothing about the `text/html` target-type).
> > 
> > As for why we decode it as latin-1, it's (under GNU/Linux; Lars may be
> > using something else because he's getting something with a `charset`
> > property which I don't get here) because:
> > - selection_data_to_lisp_data (in xselect.c) makes a unibyte string with
> >   the property `foreign-selection` set to `STRING` when the actual
> >   string type is not known (as opposed to COMPOUND-TEXT and
> >   UTF8-STRING, basically).
> > - in gui-get-selection we then have a mapping from `STRING` to
> >   `iso-8859-1` (which is apparently the right thing for the official
> >   `STRING` target-type in X11).
> > 
> > I can't figure out if/where these kinds of things about the X11
> > selection protocol is described, but at least in `xclip` they have
> > a hack specifically for this case:
> > 
> >     [...]
> >     if (html != None && sel_type == html) {
> > 	/* if the buffer contains UCS-2 (UTF-16), convert to
> > 	 * UTF-8.  Mozilla-based browsers do this for the
> > 	 * text/html target.
> > 	 */
> >     [...]
> > 
> > and according to the subsequent code it's not even always the
> > same endianness.
> > 
> > I don't know what is the difference between the `target-type` passed to
> > x-get-selection-internal and the `foreign-selection` property we get on
> > the returned string (they seem to be the same in my tests, except when
> > the type is not one of the known ones, and where we then force
> > `foreign-selection` to be `STRING`).
> 
> I hope Handa-san (CC'ed) could comment on this.

Message #17 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Kenichi Handa <handa <at> gnu.org>
Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
Subject: Re: bug#31149: 27.0.50;
 (gui-get-selection nil 'text/html) returns mis-decoded text
Date: Sat, 05 May 2018 12:37:24 +0300

Ping! Ping!

> Date: Tue, 24 Apr 2018 21:11:10 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
> 
> Ping!
> 
> > Date: Sat, 14 Apr 2018 09:32:41 +0300
> > From: Eli Zaretskii <eliz <at> gnu.org>
> > Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org
> > 
> > > From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
> > > Date: Fri, 13 Apr 2018 16:55:26 -0400
> > > Cc: Lars Ingebrigtsen <larsi <at> gnus.org>
> > > 
> > > (gui-get-selection nil 'text/html)
> > > 
> > > returns utf-16 text when the primary selection is owned by Mozilla, but
> > > we decode it as latin-1 instead, so it looks like garbage.
> > > 
> > > I don't know why we're getting utf-16.  Is that what standards say it
> > > should do?  If so, we should adjust our code (which currently knows
> > > nothing about the `text/html` target-type).
> > > 
> > > As for why we decode it as latin-1, it's (under GNU/Linux; Lars may be
> > > using something else because he's getting something with a `charset`
> > > property which I don't get here) because:
> > > - selection_data_to_lisp_data (in xselect.c) makes a unibyte string with
> > >   the property `foreign-selection` set to `STRING` when the actual
> > >   string type is not known (as opposed to COMPOUND-TEXT and
> > >   UTF8-STRING, basically).
> > > - in gui-get-selection we then have a mapping from `STRING` to
> > >   `iso-8859-1` (which is apparently the right thing for the official
> > >   `STRING` target-type in X11).
> > > 
> > > I can't figure out if/where these kinds of things about the X11
> > > selection protocol is described, but at least in `xclip` they have
> > > a hack specifically for this case:
> > > 
> > >     [...]
> > >     if (html != None && sel_type == html) {
> > > 	/* if the buffer contains UCS-2 (UTF-16), convert to
> > > 	 * UTF-8.  Mozilla-based browsers do this for the
> > > 	 * text/html target.
> > > 	 */
> > >     [...]
> > > 
> > > and according to the subsequent code it's not even always the
> > > same endianness.
> > > 
> > > I don't know what is the difference between the `target-type` passed to
> > > x-get-selection-internal and the `foreign-selection` property we get on
> > > the returned string (they seem to be the same in my tests, except when
> > > the type is not one of the known ones, and where we then force
> > > `foreign-selection` to be `STRING`).
> > 
> > I hope Handa-san (CC'ed) could comment on this.
> 
> 
> 
> 

Message #20 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Kenichi Handa <handa <at> gnu.org>
Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
Subject: Re: bug#31149: 27.0.50;
 (gui-get-selection nil 'text/html) returns mis-decoded text
Date: Fri, 11 May 2018 12:18:13 +0300

Ping! Ping! Ping!

> Date: Sat, 05 May 2018 12:37:24 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
> 
> Ping! Ping!
> 
> > Date: Tue, 24 Apr 2018 21:11:10 +0300
> > From: Eli Zaretskii <eliz <at> gnu.org>
> > Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
> > 
> > Ping!
> > 
> > > Date: Sat, 14 Apr 2018 09:32:41 +0300
> > > From: Eli Zaretskii <eliz <at> gnu.org>
> > > Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org
> > > 
> > > > From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
> > > > Date: Fri, 13 Apr 2018 16:55:26 -0400
> > > > Cc: Lars Ingebrigtsen <larsi <at> gnus.org>
> > > > 
> > > > (gui-get-selection nil 'text/html)
> > > > 
> > > > returns utf-16 text when the primary selection is owned by Mozilla, but
> > > > we decode it as latin-1 instead, so it looks like garbage.
> > > > 
> > > > I don't know why we're getting utf-16.  Is that what standards say it
> > > > should do?  If so, we should adjust our code (which currently knows
> > > > nothing about the `text/html` target-type).
> > > > 
> > > > As for why we decode it as latin-1, it's (under GNU/Linux; Lars may be
> > > > using something else because he's getting something with a `charset`
> > > > property which I don't get here) because:
> > > > - selection_data_to_lisp_data (in xselect.c) makes a unibyte string with
> > > >   the property `foreign-selection` set to `STRING` when the actual
> > > >   string type is not known (as opposed to COMPOUND-TEXT and
> > > >   UTF8-STRING, basically).
> > > > - in gui-get-selection we then have a mapping from `STRING` to
> > > >   `iso-8859-1` (which is apparently the right thing for the official
> > > >   `STRING` target-type in X11).
> > > > 
> > > > I can't figure out if/where these kinds of things about the X11
> > > > selection protocol is described, but at least in `xclip` they have
> > > > a hack specifically for this case:
> > > > 
> > > >     [...]
> > > >     if (html != None && sel_type == html) {
> > > > 	/* if the buffer contains UCS-2 (UTF-16), convert to
> > > > 	 * UTF-8.  Mozilla-based browsers do this for the
> > > > 	 * text/html target.
> > > > 	 */
> > > >     [...]
> > > > 
> > > > and according to the subsequent code it's not even always the
> > > > same endianness.
> > > > 
> > > > I don't know what is the difference between the `target-type` passed to
> > > > x-get-selection-internal and the `foreign-selection` property we get on
> > > > the returned string (they seem to be the same in my tests, except when
> > > > the type is not one of the known ones, and where we then force
> > > > `foreign-selection` to be `STRING`).
> > > 
> > > I hope Handa-san (CC'ed) could comment on this.
> > 

Message #23 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Kenichi Handa <handa <at> gnu.org>
Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
Subject: Re: bug#31149: 27.0.50;
 (gui-get-selection nil 'text/html) returns mis-decoded text
Date: Sat, 19 May 2018 11:50:37 +0300

Ping! Ping! Ping! Ping!

> Date: Fri, 11 May 2018 12:18:13 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
> 
> Ping! Ping! Ping!
> 
> > Date: Sat, 05 May 2018 12:37:24 +0300
> > From: Eli Zaretskii <eliz <at> gnu.org>
> > Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
> > 
> > Ping! Ping!
> > 
> > > Date: Tue, 24 Apr 2018 21:11:10 +0300
> > > From: Eli Zaretskii <eliz <at> gnu.org>
> > > Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
> > > 
> > > Ping!
> > > 
> > > > Date: Sat, 14 Apr 2018 09:32:41 +0300
> > > > From: Eli Zaretskii <eliz <at> gnu.org>
> > > > Cc: larsi <at> gnus.org, 31149 <at> debbugs.gnu.org
> > > > 
> > > > > From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
> > > > > Date: Fri, 13 Apr 2018 16:55:26 -0400
> > > > > Cc: Lars Ingebrigtsen <larsi <at> gnus.org>
> > > > > 
> > > > > (gui-get-selection nil 'text/html)
> > > > > 
> > > > > returns utf-16 text when the primary selection is owned by Mozilla, but
> > > > > we decode it as latin-1 instead, so it looks like garbage.
> > > > > 
> > > > > I don't know why we're getting utf-16.  Is that what standards say it
> > > > > should do?  If so, we should adjust our code (which currently knows
> > > > > nothing about the `text/html` target-type).
> > > > > 
> > > > > As for why we decode it as latin-1, it's (under GNU/Linux; Lars may be
> > > > > using something else because he's getting something with a `charset`
> > > > > property which I don't get here) because:
> > > > > - selection_data_to_lisp_data (in xselect.c) makes a unibyte string with
> > > > >   the property `foreign-selection` set to `STRING` when the actual
> > > > >   string type is not known (as opposed to COMPOUND-TEXT and
> > > > >   UTF8-STRING, basically).
> > > > > - in gui-get-selection we then have a mapping from `STRING` to
> > > > >   `iso-8859-1` (which is apparently the right thing for the official
> > > > >   `STRING` target-type in X11).
> > > > > 
> > > > > I can't figure out if/where these kinds of things about the X11
> > > > > selection protocol is described, but at least in `xclip` they have
> > > > > a hack specifically for this case:
> > > > > 
> > > > >     [...]
> > > > >     if (html != None && sel_type == html) {
> > > > > 	/* if the buffer contains UCS-2 (UTF-16), convert to
> > > > > 	 * UTF-8.  Mozilla-based browsers do this for the
> > > > > 	 * text/html target.
> > > > > 	 */
> > > > >     [...]
> > > > > 
> > > > > and according to the subsequent code it's not even always the
> > > > > same endianness.
> > > > > 
> > > > > I don't know what is the difference between the `target-type` passed to
> > > > > x-get-selection-internal and the `foreign-selection` property we get on
> > > > > the returned string (they seem to be the same in my tests, except when
> > > > > the type is not one of the known ones, and where we then force
> > > > > `foreign-selection` to be `STRING`).
> > > > 
> > > > I hope Handa-san (CC'ed) could comment on this.
> > > 
> 
> 
> 
> 

Message #26 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 31149 <at> debbugs.gnu.org
Subject: Re: bug#31149: 27.0.50; (gui-get-selection nil 'text/html) returns
 mis-decoded text
Date: Sun, 29 Sep 2019 10:44:48 +0200

Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes:

> (gui-get-selection nil 'text/html)
>
> returns utf-16 text when the primary selection is owned by Mozilla, but
> we decode it as latin-1 instead, so it looks like garbage.

This is still the case on the trunk:

#("ÿþM^@e^@r^@g^@e^@d^@" 0 14 (foreign-selection STRING charset iso-8859-1))

[...]

> I can't figure out if/where these kinds of things about the X11
> selection protocol is described, but at least in `xclip` they have
> a hack specifically for this case:
>
>     [...]
>     if (html != None && sel_type == html) {
> 	/* if the buffer contains UCS-2 (UTF-16), convert to
> 	 * UTF-8.  Mozilla-based browsers do this for the
> 	 * text/html target.
> 	 */
>     [...]
>
> and according to the subsequent code it's not even always the
> same endianness.

I think it would make sense for us to do the same here.  It should be
easy enough for us to detect that the string is utf-16, I think?  The
data has a BOM and everything...

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #29 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
Subject: Re: bug#31149: 27.0.50;
 (gui-get-selection nil 'text/html) returns mis-decoded text
Date: Sun, 29 Sep 2019 12:31:58 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Date: Sun, 29 Sep 2019 10:44:48 +0200
> Cc: 31149 <at> debbugs.gnu.org
> 
> >     if (html != None && sel_type == html) {
> > 	/* if the buffer contains UCS-2 (UTF-16), convert to
> > 	 * UTF-8.  Mozilla-based browsers do this for the
> > 	 * text/html target.
> > 	 */
> >     [...]
> >
> > and according to the subsequent code it's not even always the
> > same endianness.
> 
> I think it would make sense for us to do the same here.  It should be
> easy enough for us to detect that the string is utf-16, I think?

I think you want to use auto-coding-regexp-alist-lookup.

> The data has a BOM

Does it?  It doesn't have to, at least not in principle.

Message #32 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
Subject: Re: bug#31149: 27.0.50; (gui-get-selection nil 'text/html) returns
 mis-decoded text
Date: Sun, 29 Sep 2019 11:37:28 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> I think it would make sense for us to do the same here.  It should be
>> easy enough for us to detect that the string is utf-16, I think?
>
> I think you want to use auto-coding-regexp-alist-lookup.

Ah, thanks.  So should I go ahead and make this change?  It looks pretty
trivial, but I guess there could be interop problems with code that
assumes the current odd behaviour.

>> The data has a BOM
>
> Does it?  It doesn't have to, at least not in principle.

It doesn't have to, but it always does on the systems I've tested on.
But I guess it doesn't matter, `auto-coding-regexp-alist-lookup' will
figure it out in any case...

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #35 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
Subject: Re: bug#31149: 27.0.50; (gui-get-selection nil 'text/html) returns
 mis-decoded text
Date: Sun, 29 Sep 2019 12:52:19 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: monnier <at> IRO.UMontreal.CA,  31149 <at> debbugs.gnu.org
> Date: Sun, 29 Sep 2019 11:37:28 +0200
> 
> > I think you want to use auto-coding-regexp-alist-lookup.
> 
> Ah, thanks.  So should I go ahead and make this change?  It looks pretty
> trivial, but I guess there could be interop problems with code that
> assumes the current odd behaviour.

What odd behavior is that?  I understood that we just display binary
garbage, something that no one should miss.

Message #38 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
Subject: Re: bug#31149: 27.0.50; (gui-get-selection nil 'text/html) returns
 mis-decoded text
Date: Sun, 29 Sep 2019 12:02:42 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Ah, thanks.  So should I go ahead and make this change?  It looks pretty
>> trivial, but I guess there could be interop problems with code that
>> assumes the current odd behaviour.
>
> What odd behavior is that?  I understood that we just display binary
> garbage, something that no one should miss.

We don't have any commands to yank HTML, so we don't display anything,
but I've got code like the following in one of my out-of-tree packages
(which will fail after the fix).  I'm with that, though, but I have no
idea how much other people would be impacted.

(defun ewp-yank-html ()

[...]

  (let ((data (loop for type in '(PRIMARY CLIPBOARD)
		    for data = (x-get-selection-internal type 'text/html)

[...]

      ;; Somehow the selection is UTF-16 when selecting text in
      ;; Firefox.
      (decode-coding-string data 'utf-16-le)


-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #41 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
Subject: Re: bug#31149: 27.0.50; (gui-get-selection nil 'text/html) returns
 mis-decoded text
Date: Sun, 29 Sep 2019 13:21:13 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: monnier <at> IRO.UMontreal.CA,  31149 <at> debbugs.gnu.org
> Date: Sun, 29 Sep 2019 12:02:42 +0200
> 
> (defun ewp-yank-html ()
> 
> [...]
> 
>   (let ((data (loop for type in '(PRIMARY CLIPBOARD)
> 		    for data = (x-get-selection-internal type 'text/html)
> 
> [...]
> 
>       ;; Somehow the selection is UTF-16 when selecting text in
>       ;; Firefox.
>       (decode-coding-string data 'utf-16-le)

And you do that for _every_ text you get from the clipboard?  Or do
you have some means of detecting those selected in Firefox?

In general, if the text is already decoded, I don't expect this extra
decoding to do anything bad, does it?

Message #44 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 31149 <at> debbugs.gnu.org, monnier <at> IRO.UMontreal.CA
Subject: Re: bug#31149: 27.0.50; (gui-get-selection nil 'text/html) returns
 mis-decoded text
Date: Sun, 29 Sep 2019 13:48:31 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>>       ;; Somehow the selection is UTF-16 when selecting text in
>>       ;; Firefox.
>>       (decode-coding-string data 'utf-16-le)
>
> And you do that for _every_ text you get from the clipboard?  Or do
> you have some means of detecting those selected in Firefox?

In this package, I'm assuming all the text comes from Firefox because
that's what I use.  :-)

> In general, if the text is already decoded, I don't expect this extra
> decoding to do anything bad, does it?

That's true, so perhaps this isn't a problem:

(decode-coding-string "fóo" 'utf-16-le)
=> "fóo"

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #47 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 31149 <at> debbugs.gnu.org
Subject: Re: bug#31149: 27.0.50; (gui-get-selection nil 'text/html) returns
 mis-decoded text
Date: Mon, 08 Nov 2021 02:07:32 +0100

Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes:

> (gui-get-selection nil 'text/html)
>
> returns utf-16 text when the primary selection is owned by Mozilla, but
> we decode it as latin-1 instead, so it looks like garbage.

This should now be fixed on the trunk, and hopefully I didn't regress
anything, but I have not regressed anything.  (I've only tested on
Debian and Macos.)  Let me know whether I broke something.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #52 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 31149 <at> debbugs.gnu.org
Subject: Re: bug#31149: 27.0.50; (gui-get-selection nil 'text/html) returns
 mis-decoded text
Date: Mon, 08 Nov 2021 02:12:16 +0100

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> This should now be fixed on the trunk, and hopefully I didn't regress
> anything, but I have not regressed anything. 

Urr.  I think it's getting a bit late in the day.  Substitute with
sentences that makes sense instead.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #57 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 31149 <at> debbugs.gnu.org
Subject: Re: bug#31149: 27.0.50; (gui-get-selection nil 'text/html) returns
 mis-decoded text
Date: Tue, 09 Nov 2021 04:44:17 +0100

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes:
>
>> (gui-get-selection nil 'text/html)
>>
>> returns utf-16 text when the primary selection is owned by Mozilla, but
>> we decode it as latin-1 instead, so it looks like garbage.
>
> This should now be fixed on the trunk, and hopefully I didn't regress
> anything, but I have not regressed anything.  (I've only tested on
> Debian and Macos.)  Let me know whether I broke something.

It broke selection on Windows, so I've reverted and reopened this bug
report.

From the discussion on emacs-devel:

> > > Does reverting 5e66c75e0 fix the issue?
> > 
> > I've reverted it now and will have to reexamine the problem before
> > attempting a new fix.
> 
> Whatever you do, don't decode the selection text on MS-Windows.  It is
> already decoded (see w32-get-clipboard-data), and
> selection-coding-system is UTF-16 on MS-Windows, so decoding a decoded
> string by that will not do anything useful ;-)
> 
> The existing code carefully side-steps the decoding by looking at the
> foreign-selection property on the string, which the Windows code
> doesn't set.  But your changes removed that test, and thus caused the
> clipboard text to be decoded on Windows.

So I'll be re-exploring this issue once I get my Windows VMs back up and
can do some testing on Windows, too.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #60 received at 31149 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 31149 <at> debbugs.gnu.org
Subject: Re: bug#31149: 27.0.50; (gui-get-selection nil 'text/html) returns
 mis-decoded text
Date: Thu, 11 Nov 2021 05:24:52 +0100

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> It broke selection on Windows, so I've reverted and reopened this bug
> report.

I've now reapplied a tweaked version of the patch, and checked that it
doesn't break selection on Windows.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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