GNU bug report logs - #24804
25.1; posn-at-point erroneously signals an error

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#23809: closed (24.5; Positive argument to 'posn-at-point'
 throws erros as being negative)
Date: Sat, 29 Oct 2016 22:04:03 +0000

[Message part 1 (text/plain, inline)]

Your message dated Sun, 30 Oct 2016 01:03:17 +0300
with message-id <831syyrexm.fsf <at> gnu.org>
and subject line Re: bug#24804: 25.1; posn-at-point erroneously signals an error
has caused the debbugs.gnu.org bug report #24804,
regarding 24.5; Positive argument to 'posn-at-point' throws erros as being negative
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
24804: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24804
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Lluís Vilanova <vilanova <at> ac.upc.edu>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5;
 Positive argument to 'posn-at-point' throws erros as being negative
Date: Mon, 20 Jun 2016 18:30:51 +0200

To reproduce:

* Open a PDF on a separate window on the same frame using pdf-tools.
* Select that window.
* Scroll a bit down the first page of the PDF.
* Use windmove to move from the pdf-view-mode buffer to the first one.


With these steps, I get this backtrace:

  Debugger entered--Lisp error: (wrong-type-argument wholenump -14)
    posn-at-point(619194 #)
    (nth 2 (posn-at-point (window-point window) window))
    (let ((posn-cons (nth 2 (posn-at-point (window-point window) window)))) (if hor (+ (or (cdr posn-cons) 1) (window-pixel-top window)) (+ (or (car posn-cons) 1) (window-pixel-left window))))
    (cond ((and (numberp sign) (< sign 0)) (if hor (1- (+ (window-pixel-top window) (window-pixel-height window))) (1- (+ (window-pixel-left window) (window-pixel-width window))))) ((and (numberp sign) (> sign 0)) (if hor (window-pixel-top window) (window-pixel-left window))) ((let ((posn-cons (nth 2 (posn-at-point (window-point window) window)))) (if hor (+ (or (cdr posn-cons) 1) (window-pixel-top window)) (+ (or (car posn-cons) 1) (window-pixel-left window))))))
    (let* ((frame (window-frame window)) (hor (memq direction (quote (left right)))) (first (if hor (window-pixel-left window) (window-pixel-top window))) (last (+ first (window-size window hor t))) (posn (cond ((and (numberp sign) (< sign 0)) (if hor (1- (+ ... ...)) (1- (+ ... ...)))) ((and (numberp sign) (> sign 0)) (if hor (window-pixel-top window) (window-pixel-left window))) ((let ((posn-cons ...)) (if hor (+ ... ...) (+ ... ...)))))) (best-edge (cond ((eq direction (quote below)) (frame-pixel-height frame)) ((eq direction (quote right)) (frame-pixel-width frame)) (t -1))) (best-edge-2 best-edge) (best-diff-2 (if hor (frame-pixel-height frame) (frame-pixel-width frame))) best best-2 best-diff-2-new) (walk-window-tree (function (lambda (w) (let* ((w-top (window-pixel-top w)) (w-left (window-pixel-left w))) (cond ((or ... ...)) (hor (cond ... ...)) ((and ... ...) (if ... ...)) ((and ... ... ...) (setq best-edge-2 w-top) (setq best-diff-2 best-diff-2-new) (setq best-2 w)))))) frame nil (and mini t)) (or best best-2))
    window-in-direction(left nil nil nil nil t)
    windmove-find-other-window(left nil nil)
    windmove-do-window-select(left nil)
    windmove-left(nil)
    #(windmove-left nil nil)
    ad-Advice-call-interactively(# windmove-left nil nil)
    apply(ad-Advice-call-interactively # (windmove-left nil nil))
    call-interactively(windmove-left nil nil)
    command-execute(windmove-left)


Note how the argument to posn-at-point (returned by window-point) is actually
positive (619194), but the error raised by Emacs complains about the number
being negative (-14).

Thanks,
  Lluis


Auto-gathered information:

In GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2016-04-08 on binet, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11803000
System Description:	Debian GNU/Linux testing (stretch)

Configured using:
 `configure --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.5/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.5/site-lisp:/usr/share/emacs/site-lisp
 --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
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 --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.5/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.5/site-lisp:/usr/share/emacs/site-lisp
 --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2
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Important settings:
  value of $LANG: ca_ES.UTF-8
  locale-coding-system: utf-8

Major mode: Debugger

Minor modes in effect:
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  TeX-PDF-mode: 1
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  column-number-mode: t
  line-number-mode: t
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Recent messages:
Guessed variable 'css-indent-offset' (2)
Ispell process killed
Starting new Ispell process aspell with default dictionary...
Winner undo (1 / 7)
1238378 (#o4562552, #x12e56a)
Type "q" in help window to restore its previous buffer.
Mark set [2 times]
Quit
(#<window 529 on *Backtrace*> 1 (0 . 0) 0 nil 1 (0 . 0) nil (0 . 0) (8 . 14))
nil [3 times]

Load-path shadows:
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/usr/share/emacs24/site-lisp/latex-cjk-thai/thai-word hides /usr/share/emacs/24.5/lisp/language/thai-word

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[Message part 3 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: Andreas Politz <politza <at> hochschule-trier.de>
Cc: 24804-done <at> debbugs.gnu.org
Subject: Re: bug#24804: 25.1; posn-at-point erroneously signals an error
Date: Sun, 30 Oct 2016 01:03:17 +0300

> From: Andreas Politz <politza <at> hochschule-trier.de>
> Cc: 24804 <at> debbugs.gnu.org
> Date: Sat, 29 Oct 2016 22:33:00 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > Done.  Let me know if something else should be done before closing
> > this bug.
> 
> Nothing.  I'm not clear about the general semantics of this function,
> but we don't need to discuss this right now.

OK, I'm therefore closing the bug (and the two merged with it).
People who think there are still leftovers are welcome to reopen with
details.

As for your questions about the semantics, I suggest to start a
discussion on emacs-devel.

Thanks.

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