GNU bug report logs - #5998
23.1.96; Breadcrumbs defeat C-u 1 C-v in Info

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Package: emacs; Reported by: Eli Zaretskii <eliz@HIDDEN>; dated Wed, 21 Apr 2010 17:20:03 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Juri Linkov <juri@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#5998: 23.1.96; Breadcrumbs defeat C-u 1 C-v in Info
Organization: JURTA
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Date: Fri, 23 Apr 2010 21:08:47 +0300
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	2010 20:38:33 +0300")
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>> > For that, I'd request a separate bug report, with a clear recipe to
>> > reproduce ``the bug'' and an explanation what behavior was expected.
>>
>> I tried to create a clear recipe to reproduce it:
>>
>> (progn
>>   (goto-char (point-min))
>>   (insert "line 0\nline 1\nline 2\nline 3\n")
>>   (narrow-to-region (+ 7 (point-min)) (point-max))
>>   (let ((ov (make-overlay (point-min) (+ 6 (point-min)))))
>>     (overlay-put ov 'invisible t)
>>     (overlay-put ov 'after-string "after-string 1")
>>     (overlay-put ov 'evaporate t))
>>   (goto-char (point-min))
>>   (scroll-up 1))
>>
>> but it doesn't fail.  Something more from Info mode affects it.
>
> Okay, but why do you think the bug is in redisplay?

It seems the bug is somewhere in `move_it_by_lines'.
I don't know whether it is redisplay or not.

-- 
Juri Linkov
http://www.jurta.org/emacs/




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bug#5998; Package emacs. Full text available.

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Date: Fri, 23 Apr 2010 20:38:33 +0300
From: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#5998: 23.1.96; Breadcrumbs defeat C-u 1 C-v in Info
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> From: Juri Linkov <juri@HIDDEN>
> Cc: Stefan Monnier <monnier@HIDDEN>,  5998 <at> debbugs.gnu.org
> Date: Fri, 23 Apr 2010 19:57:31 +0300
> 
> >> Fine by me, it's a good change anyway.  But we should still try and fix
> >> the underlying redisplay bug, of course.
> >
> > For that, I'd request a separate bug report, with a clear recipe to
> > reproduce ``the bug'' and an explanation what behavior was expected.
> 
> I tried to create a clear recipe to reproduce it:
> 
> (progn
>   (goto-char (point-min))
>   (insert "line 0\nline 1\nline 2\nline 3\n")
>   (narrow-to-region (+ 7 (point-min)) (point-max))
>   (let ((ov (make-overlay (point-min) (+ 6 (point-min)))))
>     (overlay-put ov 'invisible t)
>     (overlay-put ov 'after-string "after-string 1")
>     (overlay-put ov 'evaporate t))
>   (goto-char (point-min))
>   (scroll-up 1))
> 
> but it doesn't fail.  Something more from Info mode affects it.

Okay, but why do you think the bug is in redisplay?




Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#5998; Package emacs. Full text available.

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From: Juri Linkov <juri@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#5998: 23.1.96; Breadcrumbs defeat C-u 1 C-v in Info
Organization: JURTA
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>> Fine by me, it's a good change anyway.  But we should still try and fix
>> the underlying redisplay bug, of course.
>
> For that, I'd request a separate bug report, with a clear recipe to
> reproduce ``the bug'' and an explanation what behavior was expected.

I tried to create a clear recipe to reproduce it:

(progn
  (goto-char (point-min))
  (insert "line 0\nline 1\nline 2\nline 3\n")
  (narrow-to-region (+ 7 (point-min)) (point-max))
  (let ((ov (make-overlay (point-min) (+ 6 (point-min)))))
    (overlay-put ov 'invisible t)
    (overlay-put ov 'after-string "after-string 1")
    (overlay-put ov 'evaporate t))
  (goto-char (point-min))
  (scroll-up 1))

but it doesn't fail.  Something more from Info mode affects it.

-- 
Juri Linkov
http://www.jurta.org/emacs/




Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#5998; Package emacs. Full text available.

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Date: Fri, 23 Apr 2010 18:32:25 +0300
From: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#5998: 23.1.96; Breadcrumbs defeat C-u 1 C-v in Info
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> From: Stefan Monnier <monnier@HIDDEN>
> Cc: Eli Zaretskii <eliz@HIDDEN>, 5998 <at> debbugs.gnu.org
> Date: Fri, 23 Apr 2010 10:38:03 -0400
> 
> > If there are no objections, I'll install this patch to the
> > emacs-23 branch.
> 
> Fine by me, it's a good change anyway.  But we should still try and fix
> the underlying redisplay bug, of course.

For that, I'd request a separate bug report, with a clear recipe to
reproduce ``the bug'' and an explanation what behavior was expected.




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bug#5998; Package emacs. Full text available.

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From: Stefan Monnier <monnier@HIDDEN>
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Subject: Re: bug#5998: 23.1.96; Breadcrumbs defeat C-u 1 C-v in Info
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> If there are no objections, I'll install this patch to the
> emacs-23 branch.

Fine by me, it's a good change anyway.  But we should still try and fix
the underlying redisplay bug, of course.


        Stefan


>>>> C-u 1 C-v
>>>> 
>>>> Note that the display does not scroll by one line.  "C-u 2 C-v" does
>>>> scroll by 2 lines, as well as "C-u 1 C-v" if the breadcrumbs are not
>>>> visible.
>> 
>> This patch removes the scrolling problem:
>> 
>> === modified file 'lisp/info.el'
>> --- lisp/info.el	2010-04-20 00:49:46 +0000
>> +++ lisp/info.el	2010-04-22 09:01:46 +0000
>> @@ -4365,8 +4365,7 @@ (defun Info-fontify-node ()
>> (cond
>> ((> Info-breadcrumbs-depth 0)
>> (let ((ov (make-overlay (point-min) (1+ header-end))))
>> -		(overlay-put ov 'invisible t)
>> -		(overlay-put ov 'after-string (Info-breadcrumbs))
>> +		(overlay-put ov 'display (Info-breadcrumbs))
>> (overlay-put ov 'evaporate t)))
>> ((not (bobp))
>> ;; Hide the punctuation at the end, too.

> -- 
> Juri Linkov
> http://www.jurta.org/emacs/







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From: Juri Linkov <juri@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#5998: 23.1.96; Breadcrumbs defeat C-u 1 C-v in Info
Organization: JURTA
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	22 Apr 2010 12:03:30 +0300")
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If there are no objections, I'll install this patch to the
emacs-23 branch.

>>>  C-u 1 C-v
>>>
>>> Note that the display does not scroll by one line.  "C-u 2 C-v" does
>>> scroll by 2 lines, as well as "C-u 1 C-v" if the breadcrumbs are not
>>> visible.
>
> This patch removes the scrolling problem:
>
> === modified file 'lisp/info.el'
> --- lisp/info.el	2010-04-20 00:49:46 +0000
> +++ lisp/info.el	2010-04-22 09:01:46 +0000
> @@ -4365,8 +4365,7 @@ (defun Info-fontify-node ()
>              (cond
>               ((> Info-breadcrumbs-depth 0)
>  	      (let ((ov (make-overlay (point-min) (1+ header-end))))
> -		(overlay-put ov 'invisible t)
> -		(overlay-put ov 'after-string (Info-breadcrumbs))
> +		(overlay-put ov 'display (Info-breadcrumbs))
>  		(overlay-put ov 'evaporate t)))
>               ((not (bobp))
>                ;; Hide the punctuation at the end, too.

-- 
Juri Linkov
http://www.jurta.org/emacs/




Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#5998; Package emacs. Full text available.

Message received at 5998 <at> debbugs.gnu.org:


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From: Juri Linkov <juri@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#5998: 23.1.96; Breadcrumbs defeat C-u 1 C-v in Info
Organization: JURTA
References: <83iq7k4tcl.fsf@HIDDEN> <87633jopet.fsf@HIDDEN>
Date: Thu, 22 Apr 2010 12:03:30 +0300
In-Reply-To: <87633jopet.fsf@HIDDEN> (Juri Linkov's message of "Thu,
	22 Apr 2010 11:35:10 +0300")
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>>  C-u 1 C-v
>>
>> Note that the display does not scroll by one line.  "C-u 2 C-v" does
>> scroll by 2 lines, as well as "C-u 1 C-v" if the breadcrumbs are not
>> visible.

This patch removes the scrolling problem:

=== modified file 'lisp/info.el'
--- lisp/info.el	2010-04-20 00:49:46 +0000
+++ lisp/info.el	2010-04-22 09:01:46 +0000
@@ -4365,8 +4365,7 @@ (defun Info-fontify-node ()
             (cond
              ((> Info-breadcrumbs-depth 0)
 	      (let ((ov (make-overlay (point-min) (1+ header-end))))
-		(overlay-put ov 'invisible t)
-		(overlay-put ov 'after-string (Info-breadcrumbs))
+		(overlay-put ov 'display (Info-breadcrumbs))
 		(overlay-put ov 'evaporate t)))
              ((not (bobp))
               ;; Hide the punctuation at the end, too.

-- 
Juri Linkov
http://www.jurta.org/emacs/




Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#5998; Package emacs. Full text available.

Message received at 5998 <at> debbugs.gnu.org:


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From: Juri Linkov <juri@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#5998: 23.1.96; Breadcrumbs defeat C-u 1 C-v in Info
Organization: JURTA
References: <83iq7k4tcl.fsf@HIDDEN>
Date: Thu, 22 Apr 2010 11:35:10 +0300
In-Reply-To: <83iq7k4tcl.fsf@HIDDEN> (Eli Zaretskii's message of "Wed, 21 Apr
	2010 20:18:34 +0300")
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>  C-u 1 C-v
>
> Note that the display does not scroll by one line.  "C-u 2 C-v" does
> scroll by 2 lines, as well as "C-u 1 C-v" if the breadcrumbs are not
> visible.

It seems the bug is in the display engine.  `move_it_to' in
`window_scroll_pixel_based' doesn't move point when it's on
the overlay with the breadcrumbs line.

-- 
Juri Linkov
http://www.jurta.org/emacs/




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Subject: RE: bug#5998: 23.1.96; Breadcrumbs defeat C-u 1 C-v in Info
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>  emacs -Q
>  C-u C-h i /path/to/emacs/info/emacs RET
>  g Narrowing RET
>  C-u 1 C-v
> 
> Note that the display does not scroll by one line.

And it is a regression: the problem does not exist in
GNU Emacs 23.1.95.1 (i386-mingw-nt5.1.2600)
 of 2010-04-03 on G41R2F1





Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#5998; Package emacs. Full text available.

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


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Subject: 23.1.96; Breadcrumbs defeat C-u 1 C-v in Info
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 emacs -Q
 C-u C-h i /path/to/emacs/info/emacs RET
 g Narrowing RET
 C-u 1 C-v

Note that the display does not scroll by one line.  "C-u 2 C-v" does
scroll by 2 lines, as well as "C-u 1 C-v" if the breadcrumbs are not
visible.

You can see this in any node, not just in Narrowing, of course.


In GNU Emacs 23.1.96.1 (i386-mingw-nt5.1.2600)
 of 2010-04-20 on HOME-C4E4A596F7
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ENU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1255
  default enable-multibyte-characters: t

Major mode: Mail

Minor modes in effect:
  flyspell-mode: t
  desktop-save-mode: t
  show-paren-mode: t
  display-time-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  temp-buffer-resize-mode: t
  line-number-mode: t
  abbrev-mode: t

Recent input:
<down> <up> C-h c C-z C-z C-z C-z C-z C-z C-z C-u 1 
C-v <next> C-u 1 C-v C-z C-z C-z M-z M-z M-z M-z M-z 
M-z M-z M-z M-z M-z M-z M-z M-z M-z M-z M-z M-z M-z 
M-z M-z M-z M-z M-z M-z M-z M-z M-z M-z M-z M-z M-z 
C-z C-z M-z M-z M-z M-z M-z M-z M-z M-z M-z <up> C-z 
C-z C-z <down> C-z <down> C-z <down> C-z <down> C-z 
<down> C-z <down> C-z <down> C-z <down> C-z <down> 
C-z <down> C-z <down> C-z <down> C-z <down> C-z <down> 
C-z <down> C-z <down> C-z <down> C-z <down> C-z <down> 
C-z <down> C-z <down> C-z C-z C-z <up> <up> <up> <up> 
<up> <up> <up> <up> C-z C-z C-z M-z M-z M-z M-z M-z 
M-z M-z M-z M-z M-z M-z M-z M-z M-z <up> <up> <up> 
C-z C-z M-z M-z M-z M-z M-z M-z M-z M-z C-z C-z C-z 
<up> <up> <up> C-z C-z C-z C-z C-z C-z M-z M-z M-z 
M-z M-z M-z M-z M-z M-z M-z M-z C-z <up> M-z C-z M-z 
M-z C-z <down> <mouse-1> <mouse-1> <mouse-1> <mouse-1> 
M-z M-z C-z C-z C-z C-z <help-echo> <help-echo> <help-echo> 
<down-mouse-1> <mouse-2> l <help-echo> <left> <left> 
<right> <right> <left> <left> <left> <right> <kp-0> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <switch-frame> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <switch-frame> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> 
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> 
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> 
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> 
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> 
<mouse-1> <mouse-1> <mouse-1> <mouse-1> C-z C-z M-z 
M-z C-z M-z M-z C-z C-z C-z C-z <switch-frame> <switch-frame> 
<switch-frame> <switch-frame> M-x r e p o r t - e m 
<tab> <return>

Recent messages:
Mark saved where search started
Quit
"\\|@[a-zA-Z]*[ 
]\\|\\|[ 	]*$"
Making completion list...
Found `paragraph-start' in Index.  (Only match)
Beginning of buffer
C-z runs the command (lambda nil (interactive) (scroll-up 1))
Beginning of buffer [2 times]
call-interactively: Beginning of buffer [2 times]
call-interactively: End of buffer

Load-path shadows:
None found.

Features:
(shadow emacsbug multi-isearch help-mode view texinfo auth-source
message ecomplete rfc822 mml mml-sec password-cache mm-decode
mm-bodies mm-encode mailcap mail-parse rfc2231 rfc2047 rfc2045 qp
ietf-drums nnheader gnus-util netrc mm-util mail-prsvr gmm-utils
wid-edit mailheader canlock hashcash smtpmail dabbrev mailalias
mailabbrev sendmail rmailout conf-mode newcomment ld-script sh-script
executable dired-x dired-aux dired tcl generic parse-time nxml-uchnm
rng-xsd xsd-regexp rng-cmpct rng-nxml rng-valid rng-loc rng-uri
rng-parse nxml-parse rng-match rng-dt rng-util rng-pttrn nxml-ns
nxml-mode nxml-outln nxml-rap nxml-util nxml-glyph nxml-enc xmltok
sgml-mode arc-mode archive-mode make-mode python-21 python comint ring
jka-compr vc-cvs info add-log flyspell ispell org-wl org-w3m org-vm
org-rmail org-mhe org-mew org-irc org-jsinfo org-infojs org-html
org-exp org-exp-blocks org-agenda org-info org-gnus org-bibtex
org-bbdb org byte-opt bytecomp byte-compile advice help-fns
advice-preload org-footnote org-src org-list org-faces org-compat
org-macs time-date noutline outline easy-mmode vc-bzr sha1 hex-util
cc-mode cc-fonts easymenu cc-menus cc-cmds cc-styles cc-align
cc-engine cc-vars cc-defs regexp-opt rmailsum rmail mail-utils desktop
server filecache saveplace generic-x paren battery time tooltip
ediff-hook vc-hooks lisp-float-type mwheel dos-w32 disp-table ls-lisp
w32-win w32-vars tool-bar dnd fontset image fringe lisp-mode register
page menu-bar rfn-eshadow timer select scroll-bar mldrag mouse
jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
loaddefs button minibuffer faces cus-face files text-properties
overlay md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process multi-tty
emacs)





Acknowledgement sent to Eli Zaretskii <eliz@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#5998; Package emacs. Full text available.
Please note: This is a static page, with minimal formatting, updated once a day.
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Last modified: Fri, 31 Oct 2014 17:00:04 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.