GNU bug report logs - #14241
24.3; widgets and posn-at-point

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

From: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; widgets and posn-at-point
Date: Mon, 22 Apr 2013 12:00:02 +0200

Hello,

Running the following code in a graphical emacs

(let (oposn opoint)
  (widget-create 'checkbox) ; point is left after the widget
  (setq oposn (posn-at-point)
        opoint (point))
  (forward-char -1) ; point now at the widget
  (message "Old: %s (Point at %d)\nNew: %s (Point at %d)"
	   oposn opoint
	   (posn-at-point) (point)))

shows that oposn and (posn-at-point) are the same but opoint and (point)
are different.

For the record, I came accross this when looking at M-x
recentf-edit-list and hitting C-n to try and jump to the next checkbox :
the cursor always ends at the *right* of the next checkbox in a
graphical emacs.

-- 
N.



In GNU Emacs 24.3.1 (i686-pc-linux-gnu, Motif Version 2.3.4)
 of 2013-03-05 on geodiff-mac3
Bzr revision: 111320 rgm <at> gnu.org-20130305035525-ho9kah3enbz4skiv
Windowing system distributor `The X.Org Foundation', version 11.0.11301000
Configured using:
 `configure '--with-x-toolkit=motif' '--with-x''

Important settings:
  value of $LANG: fr_FR.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  helm-match-plugin-mode: t
  semantic-minor-modes-format: ((:eval (if (or semantic-highlight-edits-mode semantic-show-unmatched-syntax-mode)  S)))
  TeX-PDF-mode: t
  diff-auto-refine-mode: t
  paredit-mode: t
  rcirc-track-minor-mode: t
  window-number-mode: t
  shell-dirtrack-mode: t
  show-paren-mode: t
  recentf-mode: t
  display-time-mode: t
  ido-hacks-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-/ SPC <right> C-w C-M-q C-M-SPC C-M-SPC C-g C-g C-M-SPC 
C-g <home> <C-right> <C-end> <home> <up> <right> <right> 
<right> <right> <left> <delete> c o n s C-M-f <return> 
<tab> <end> <up> <down> <left> <left> <return> <tab> 
<up> <end> <up> <left> <left> <end> SPC ; SPC y SPC 
p o s i t i o n SPC a t SPC ( p o i n t - m i n ) <down> 
SPC ; SPC y SPC p o s i t i o n SPC a t SPC ( p o i 
n t m <backspace> - : <backspace> m i n - <backspace> 
) <C-left> <C-left> <left> ( + 1 <S-backspace> <S-backspace> 
1 <backspace> 1 + SPC C-M-f ) <C-left> <C-left> <C-left> 
C-f C-f C-h f <return> <C-end> <C-home> C-M-SPC <down> 
<down> C-g <down> <down> <down> <down> <end> <right> 
<end> C-x C-e <down> <end> C-x C-e <C-home> C-M-SPC 
C-w M-x r e p o r t - e - <backspace> <backspace> e 
m <return> w i d g e t SPC a n d SPC c o l u m n <C-left> 
n u m <backspace> <backspace> <backspace> <end> SPC 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> p o s i t i o n C-x o C-x o 
C-x o <C-left> <S-up> <S-right> C-y <up> <up> <C-right> 
<C-right> <right> <right> <right> <right> <delete> 
x <down> <left> <delete> x <C-home> C-M-SPC C-w C-x 
K C-x K C-x K C-x o <C-left> <left> s <end> <C-left> 
M-d <C-left> <left> M-d SPC a n d SPC p o s n - a t 
- p o i n t <C-left> <C-left> <C-left> <C-left> M-d 
v s <end> <backspace> <home> <C-right> M-d SPC a n 
d <C-left> M-d <delete> <left> SPC a n d <end> <return> 
<up> <up> <up> M-x <up> <return>

Recent messages:
Quit [2 times]
Mark set
Quit
Mark set
Type "q" in help window to restore its previous buffer.
Mark set [3 times]
Quit
1
2
Mark set [2 times]
byte-code: Selecting deleted buffer

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Message #8 received at 14241 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>
Cc: 14241 <at> debbugs.gnu.org
Subject: Re: bug#14241: 24.3; widgets and posn-at-point
Date: Mon, 22 Apr 2013 20:39:50 +0300

> Date: Mon, 22 Apr 2013 12:00:02 +0200
> From: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>
> 
> Running the following code in a graphical emacs
> 
> (let (oposn opoint)
>   (widget-create 'checkbox) ; point is left after the widget
>   (setq oposn (posn-at-point)
>         opoint (point))
>   (forward-char -1) ; point now at the widget
>   (message "Old: %s (Point at %d)\nNew: %s (Point at %d)"
> 	   oposn opoint
> 	   (posn-at-point) (point)))
> 
> shows that oposn and (posn-at-point) are the same but opoint and (point)
> are different.

I don't think there's a bug here.  This behavior might be surprising,
but it is entirely predictable.

The problem is that creating the checkbox widget in a GUI session puts
an overlay over 3 buffer positions, the text "[ ]".  So the buffer
position immediately preceding opoint is, for all practical purposes,
inaccessible: you cannot put point there, because Emacs will banish it
outside the overlay right away.  To see that, try this simplified
recipe:

 M-: (widget-create 'checkbox) RET
 C-x =
 M-: (forward-char -1) RET
 C-x =

See how point doesn't move?

However, the way Emacs implements this restriction is not on the
buffer level, it is on the command-loop and cursor positioning level.
So while your Lisp code runs, it "succeeds" to put point in the
forbidden area, and assigns that to opoint.  But posn-at-point
collects its data by emulating display routines, so it abides by the
rules of cursor positioning, and reports the position after the widget
regardless.  And point is moved back to after the widget once the Lisp
code is exhausted and execution returns to top level.

Any real-life code that bumps into this needs to work around this
peculiarity.  E.g., don't try forward-char to a position that is
covered by an overlay.

Message #11 received at 14241 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>
Cc: 14241 <at> debbugs.gnu.org
Subject: Re: bug#14241: 24.3; widgets and posn-at-point
Date: Tue, 23 Apr 2013 23:21:30 +0300

[Please keep the bug address on the CC line.]

> Date: Tue, 23 Apr 2013 16:53:28 +0200
> From: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>
> 
> Hello,
> 
> Thanks for your kind answer, please find some more comments below.
> 
> Le 22/04/2013 19:39, Eli Zaretskii a écrit :
> >  M-: (widget-create 'checkbox) RET
> >  C-x =
> >  M-: (forward-char -1) RET
> >  C-x =
> > 
> > See how point doesn't move?
> 
> For some reason it does move in my current working emacs session ; but
> it works as you say in a fresh one. I'm not sure it's worth trying to
> understand why there is a difference.
> 
> > Any real-life code that bumps into this needs to work around this
> > peculiarity.  E.g., don't try forward-char to a position that is
> > covered by an overlay.
> 
> Here is the example I started from :
> (let ((recentf-list (list "foo" "bar"))) ; in a real situation this
> 					; gets filled with recently
> 					; visited filenames.
>   (require 'recentf)
>   (recentf-edit-list))
> 
> [at this point the cursor should be on the first checkbox] and then hit
> C-n : the cursor doesn't stay in the same column (where the checkbox
> is), but moves to the right of it.
> 
> In this particular case, TAB does a better job so it might not be worth
> fixing it, but shouldn't C-n always try and preserve the current column
> whenever possible ?

C-n does try to preserve the current column.  But this is a tough
case, when line-move-visual is in effect (which it is by default),
because you move cursor across text most of which is invisible
(covered by overlays).

Message #14 received at 14241 <at> debbugs.gnu.org (full text, mbox):

From: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 14241 <at> debbugs.gnu.org
Subject: Re: bug#14241: 24.3; widgets and posn-at-point
Date: Wed, 24 Apr 2013 13:48:14 +0200

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

> [Please keep the bug address on the CC line.]

I will do.

>> >  M-: (widget-create 'checkbox) RET
>> >  C-x =
>> >  M-: (forward-char -1) RET
>> >  C-x =
>> > 
>> > See how point doesn't move?

Ok, I think I now fully understand your recipe. My own recipe was in
fact over-simplified for what I wanted to show. 

So I now change '-1' to '-3' in it, i.e. :

(let (oposn opoint)
  (widget-create 'checkbox) ; point is left after the widget
  (setq oposn (posn-at-point)
        opoint (point))
  (forward-char -3) ; cursor now on the widget.
  (message "Old: %s (Point at %d)\nNew: %s (Point at %d)"
	   oposn opoint
	   (posn-at-point) (point)))

and that still shows the surprising result. In other words, if in a
blank buffer I do
M-: (progn
  (widget-create 'checkbox)
  (goto-char (point-min))
  (posn-x-y (posn-at-point))) ;; or (pos-visible-in-window-p nil nil t)
then I do not get (0 0) -- that is is unexpected to me.

-- 
N.

Message #17 received at 14241 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>
Cc: 14241 <at> debbugs.gnu.org
Subject: Re: bug#14241: 24.3; widgets and posn-at-point
Date: Mon, 06 May 2013 20:12:53 +0300

> From: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>
> Cc: 14241 <at> debbugs.gnu.org
> Date: Wed, 24 Apr 2013 13:48:14 +0200
> 
> Ok, I think I now fully understand your recipe. My own recipe was in
> fact over-simplified for what I wanted to show. 
> 
> So I now change '-1' to '-3' in it, i.e. :
> 
> (let (oposn opoint)
>   (widget-create 'checkbox) ; point is left after the widget
>   (setq oposn (posn-at-point)
>         opoint (point))
>   (forward-char -3) ; cursor now on the widget.
>   (message "Old: %s (Point at %d)\nNew: %s (Point at %d)"
> 	   oposn opoint
> 	   (posn-at-point) (point)))
> 
> and that still shows the surprising result. In other words, if in a
> blank buffer I do
> M-: (progn
>   (widget-create 'checkbox)
>   (goto-char (point-min))
>   (posn-x-y (posn-at-point))) ;; or (pos-visible-in-window-p nil nil t)
> then I do not get (0 0) -- that is is unexpected to me.

That was a bug, albeit a very old one.  I fixed it now in trunk
revision 112480.

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