GNU logs - #5998, boring messages


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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)





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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Eli Zaretskii <eliz@HIDDEN>
Subject: bug#5998: Acknowledgement (23.1.96; Breadcrumbs defeat C-u 1 C-v
 in Info)
Message-ID: <handler.5998.B.127187035017382.ack <at> debbugs.gnu.org>
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X-Gnu-PR-Message: ack 5998
X-Gnu-PR-Package: emacs
Reply-To: 5998 <at> debbugs.gnu.org
Date: Wed, 21 Apr 2010 17:20:03 +0000

Thank you for filing a new bug report with GNU.

This is an automatically generated reply to let you know your message
has been received.

Your message is being forwarded to the package maintainers and other
interested parties for their attention; they will reply in due course.

Your message has been sent to the package maintainer(s):
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send it to 5998 <at> debbugs.gnu.org.

Please do not send mail to help-debbugs@HIDDEN unless you wish
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--=20
5998: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D5998
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems


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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





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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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>>  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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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/




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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: 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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>> 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/




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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?




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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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