bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Jose A. Ortega Ruiz]

Hi,

Since a while ago, when pressing TAB in an article buffer to cycle
through URLs in a message, point goes immediately to the first header
shown and repeating TAB cycles only through headers, never touching the
body.

   - Start Gnus
   - Mark in the summary of a group an HTML message (happens for both
     single and multi part messages)
   - Press h to go the the message. Point is right below the headers
   - Press TAB repeatedly: point cycles through the headers and never
     goes to the body

Thanks!


In GNU Emacs 27.0.50 (build 14, x86_64-pc-linux-gnu, X toolkit, Xaw scroll bars)
 of 2019-08-22 built on imladris
Repository revision: d9b83465c7c392d36bcbe44ccc6b66e3bec22b2d
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bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Lars Ingebrigtsen]

"Jose A. Ortega Ruiz" <jao@gnu.org> writes:

> Since a while ago, when pressing TAB in an article buffer to cycle
> through URLs in a message, point goes immediately to the first header
> shown and repeating TAB cycles only through headers, never touching the
> body.
>
>    - Start Gnus
>    - Mark in the summary of a group an HTML message (happens for both
>      single and multi part messages)
>    - Press h to go the the message. Point is right below the headers
>    - Press TAB repeatedly: point cycles through the headers and never
>      goes to the body

I'm unable to reproduce this.  What's TAB bound to in your article
buffers?

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

bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Lars Ingebrigtsen]

"Jose A. Ortega Ruiz" <jao@gnu.org> writes:

> On Fri, Sep 20 2019, Lars Ingebrigtsen wrote:
>
>> I'm unable to reproduce this.  What's TAB bound to in your article
>> buffers?
>
> Hmm, an update on this: at least in some articles now, i cannot
> reproduce it either! Maybe it's been fixed since i last tried? (i
> compile emacs from master frequently)... i'll try to reproduce the
> problem and see what's different if so.

Okidoke.  Please keep the debbugs address in the Cc headers, though,
otherwise they won't get to the bug tracker.

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

bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Jose A. Ortega Ruiz]

On Fri, Sep 20 2019, Lars Ingebrigtsen wrote:

> "Jose A. Ortega Ruiz" <jao@gnu.org> writes:
>
>> On Fri, Sep 20 2019, Lars Ingebrigtsen wrote:
>>
>>> I'm unable to reproduce this.  What's TAB bound to in your article
>>> buffers?
>>
>> Hmm, an update on this: at least in some articles now, i cannot
>> reproduce it either! Maybe it's been fixed since i last tried? (i
>> compile emacs from master frequently)... i'll try to reproduce the
>> problem and see what's different if so.
>
> Okidoke.  Please keep the debbugs address in the Cc headers, though,
> otherwise they won't get to the bug tracker.

OK, after further investigation, the cause of the problem seems to be to
use 'w3m for mm-text-html-renderer when the body of the message doesn't
have any text alternative (i.e., it's just plain html).  When the cursor
is lying right below the (visible) headers, TAB is bound to
forward-button, and that brings one to the next link in the header:
apparently, HTML links in the rendered message body are not seen as
buttons.  On the other hand, When mm-text-html-renderer is set to 'shr,
things work as expected (with TAB still bound to forward-button).

So this might be either a bug or change of behaviour of emacs-w3m
itself, rather than Gnus, unless Gnus was the one making forward-button
call w3m-next-anchor (that's what TAB does in a "normal" emacs-w3m
buffer) when the body is using 'w3m as its rendered.  All that provided
i'm understanding things correctly, of course :)

Cheers,
jao
-- 
Not far from the invention of fire must rank the invention of doubt.
-Thomas Henry Huxley, biologist (1825-1895)

bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Lars Ingebrigtsen]

"Jose A. Ortega Ruiz" <jao@gnu.org> writes:

> So this might be either a bug or change of behaviour of emacs-w3m
> itself, rather than Gnus, unless Gnus was the one making forward-button
> call w3m-next-anchor (that's what TAB does in a "normal" emacs-w3m
> buffer) when the body is using 'w3m as its rendered.  All that provided
> i'm understanding things correctly, of course :)

Gnus changed its buttons from being widgets to being button.el buttons
recently, and that's probably what you're seeing.  I didn't think about
out-of-tree HTML renderers in that context.

Perhaps mm-inline-text-html-render-with-w3m should convert the widgets
into buttons?

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

bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Jose A. Ortega Ruiz]

On Sun, Sep 22 2019, Lars Ingebrigtsen wrote:

> "Jose A. Ortega Ruiz" <jao@gnu.org> writes:
>
>> So this might be either a bug or change of behaviour of emacs-w3m
>> itself, rather than Gnus, unless Gnus was the one making forward-button
>> call w3m-next-anchor (that's what TAB does in a "normal" emacs-w3m
>> buffer) when the body is using 'w3m as its rendered.  All that provided
>> i'm understanding things correctly, of course :)
>
> Gnus changed its buttons from being widgets to being button.el buttons
> recently, and that's probably what you're seeing.  I didn't think about
> out-of-tree HTML renderers in that context.
>
> Perhaps mm-inline-text-html-render-with-w3m should convert the widgets
> into buttons?

Hmm, actually, emacs-w3m seems to be merely "imitating" widget buttons
for the benefit of gnus:

  w3m-imitate-widget-button is a variable defined in w3m.el.

  Value
  (eq major-mode 'gnus-article-mode)

  Documentation
  If non-nil, imitate the widget buttons on link (anchor) buttons.

  It is useful for moving about in a Gnus article buffer using TAB key.
  It can also be any Lisp form that should return a boolean value.

From a quick look at w3m-next-anchor, it seems links are marked using
possibly add-hoc text properties, but i see
mm-inline-text-html-render-with-w3m is already doing some non-trivial
traversal of the buffer using those properties, so possibly your idea is
right...

bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Lars Ingebrigtsen]

"Jose A. Ortega Ruiz" <jao@gnu.org> writes:

> Hmm, actually, emacs-w3m seems to be merely "imitating" widget buttons
> for the benefit of gnus:
>
>   w3m-imitate-widget-button is a variable defined in w3m.el.
>
>   Value
>   (eq major-mode 'gnus-article-mode)
>
>   Documentation
>   If non-nil, imitate the widget buttons on link (anchor) buttons.
>
>   It is useful for moving about in a Gnus article buffer using TAB key.
>   It can also be any Lisp form that should return a boolean value.

Heh.  Perhaps w3m could be amended to imitate the button.el buttons,
too?  I've Cc'd Katsumi.

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

bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Katsumi Yamaoka]

On Mon, 23 Sep 2019 12:20:41 +0200, Lars Ingebrigtsen wrote:
> "Jose A. Ortega Ruiz" <jao@gnu.org> writes:
>>   w3m-imitate-widget-button is a variable defined in w3m.el.
> Heh.  Perhaps w3m could be amended to imitate the button.el buttons,
> too?  I've Cc'd Katsumi.

First of all, it's not an Emacs bug, so I'm closing this before
getting started to work on emacs-w3m (and I'll report it here in
short when I'm able to make emacs-w3m something better).

Currently `w3m-imitate-widget-button' will work only in the body
area that emacs-w3m renders.  There tab and backtab keys are
bound to `w3m-next-anchor' and `w3m-previous-anchor' that behave
like `forward-button' and `backward-button' if evaluating the
value of `w3m-imitate-widget-button' returns non-nil.

;; I didn't know the problem since I usually use shr in almost
;; groups; I'm using `mm-text-html-renderer' as a group parameter
;; to set it to w3m in only a few groups. ;-)

Thanks.
Regards,

bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Katsumi Yamaoka]

On Tue, 24 Sep 2019 12:20:53 +0900, Katsumi Yamaoka wrote:
> First of all, it's not an Emacs bug, so I'm closing this before
> getting started to work on emacs-w3m (and I'll report it here...

I think I solved the problem in the emacs-w3m git master:
<https://github.com/emacs-w3m/emacs-w3m>
Could you give it a try?

Thanks.

bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Jose A. Ortega Ruiz]

Hi Katsumi,

> Wed, Sep 25 2019, Katsumi Yamaoka wrote:

> On Tue, 24 Sep 2019 12:20:53 +0900, Katsumi Yamaoka wrote:
>> First of all, it's not an Emacs bug, so I'm closing this before
>> getting started to work on emacs-w3m (and I'll report it here...
>
> I think I solved the problem in the emacs-w3m git master:
> <https://github.com/emacs-w3m/emacs-w3m>
> Could you give it a try?

Yes, it's working for me now, many thanks.  The only thing is that,
after landing on the first link of the message (first time one presses
tab), a message like this one appears in the echo area:

    #[771 \b\205

bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Katsumi Yamaoka]

On Wed, 25 Sep 2019 15:13:11 +0100, Jose A. Ortega Ruiz wrote:
> The only thing is that, after landing on the first link of
> the message (first time one presses tab), a message like this
> one appears in the echo area:

That's a normal behavior, i.e., to show the url and/or the title
of a link under the point, but I felt it is annoying, too,
especially if it enlarges the echo area.  So, I tried making it
truncated so to fit to the echo area.  Can you tolerate the latest
emacs-w3m git master?

If you want to see it fully, use `u' (or `Y' if you use the info-
like-map).  That command copies the url into the kill-ring.

Thanks.

bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Jose A. Ortega Ruiz]

On Thu, Sep 26 2019, Katsumi Yamaoka wrote:

> On Wed, 25 Sep 2019 15:13:11 +0100, Jose A. Ortega Ruiz wrote:
>> The only thing is that, after landing on the first link of
>> the message (first time one presses tab), a message like this
>> one appears in the echo area:
>
> That's a normal behavior, i.e., to show the url and/or the title
> of a link under the point, but I felt it is annoying, too,

No, i actually like to see the URL/title, but what i'm seeing is (only
for the first link) something that doesn't look like a URL at all, but a
debug trace... since it contains bytecode, maybe gnus filtered it out,
here it is again:

   #[771 <byte-code-removed> [w3m-track-mouse deactivate-mark nil message w3m-url-readable-string get-text-property w3m-balloon-help window-buffer] 9
    (fn WINDOW OBJECT POS)]


something like the above is what is shown in the echo area when i first
press TAB in a message, instead of the normal URL. it's as if `message'
where being passed a format with %S instead of %s, but i haven't had
the time to look at your changes to tell for sure...

> especially if it enlarges the echo area.  So, I tried making it
> truncated so to fit to the echo area.  Can you tolerate the latest
> emacs-w3m git master?

Independently of the glitch above, that's a very good addition, thanks.

jao
--
Nobody made a greater mistake than he who did nothing because he could
do only a little. -Edmund Burke, statesman and writer (1729-1797)

bug#37193: 27.0.50; TAB in article mode gets trapped in the header section

[Katsumi Yamaoka]

On Thu, 26 Sep 2019 01:08:52 +0100, Jose A. Ortega Ruiz wrote:
> No, i actually like to see the URL/title, but what i'm seeing is (only
> for the first link) something that doesn't look like a URL at all, but a
> debug trace... since it contains bytecode, maybe gnus filtered it out,
> here it is again:

>    #[771 <byte-code-removed> [w3m-track-mouse deactivate-mark nil message w3m-url-readable-string get-text-property w3m-balloon-help window-buffer] 9
>     (fn WINDOW OBJECT POS)]

Oh, I see!  I believe it's due to a button.el bug.
Please see the bug report.