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[debbugs-tracker] bug#13248: closed (24.2.50; select-window moves point

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#13248: closed (24.2.50; select-window moves point (in comint-postoutput-scroll-to-bottom))
Date: Wed, 02 Jan 2013 08:05:02 +0000

Your message dated Wed, 02 Jan 2013 09:03:09 +0100
with message-id <address@hidden>
and subject line Re: bug#13248: [PATCH] bug#13248: 24.2.50; select-window moves 
point (in comint-postoutput-scroll-to-bottom)
has caused the debbugs.gnu.org bug report #13248,
regarding 24.2.50; select-window moves point (in 
to be marked as done.

(If you believe you have received this mail in error, please contact

13248: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=13248
GNU Bug Tracking System
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--- Begin Message --- Subject: 24.2.50; select-window moves point (in comint-postoutput-scroll-to-bottom) Date: Fri, 21 Dec 2012 14:14:31 +0100


I am struggling with a-not-so-easily reproducible bug that occurs only
with ESS when sending input from a buffer to a sub-process. 

Whenever I send a string to a subprocess, the point in process buffer
jumps to the middle of the buffer, instead of staying at the
process-mark at eob, where it supposed to be. And this is not ESS

Here is what I found during my investigation.  It happens with
(select-window w) in the `comint-postoutput-scroll-to-bottom'
(reproduced below). I was monitoring the value of the (point) just
before and after it, and it looks like this:

 before (point):9943
 after  (point):8619

So the point is clearly moved in select-window. Moreover the (point)
equals (window-end) just before select-window is called, so it is
visible. Consequently, the following (comint-adjust-point selected) is
completely screwed because it relies on point *not* being moved!  

Here is a relevant piece of `comint-postoutput-scroll-to-bottom'

╭──────── #2124 ─ /home/vitoshka/TVC/emacs/lisp/comint.el ──
│           (dolist (w (get-buffer-window-list current nil t))
│             (select-window w)
│             (unwind-protect
│                 (progn
│                   (comint-adjust-point selected)
│                   ;; Optionally scroll to the bottom of the window.
│                   (and comint-scroll-show-maximum-output
│                        (eobp)
│                        (recenter (- -1 scroll-margin))))
│               (select-window selected))))))
│       (set-buffer current))))
╰──────── #2134 ─

The variable `comint-scroll-show-maximum-output' is the default t, this
is why comint runs `comint-postoutput-scroll-to-bottom' in its

I can propose a patch for commit to reset the point, but it looks like
there is something much more fundamental going on in here.



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

Major mode: Emacs-Lisp

Minor modes in effect:
  sr-popviewer-mode: t
  TeX-PDF-mode: t
  rainbow-delimiters-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  diff-auto-refine-mode: t
  helm-match-plugin-mode: t
  shell-dirtrack-mode: t
  eldoc-mode: t
  show-paren-mode: t
  savehist-mode: t
  display-time-mode: t
  ido-everywhere: t
  global-auto-revert-mode: t
  global-subword-mode: t
  subword-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
  blink-cursor-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
  hs-minor-mode: t

Recent input:
C-p C-p C-u C-M-x <down-mouse-1> <mouse-1> C-n C-SPC 
C-n C-n C-c C-r c c c C-o C-o M-> C-o <help-echo> <down-mouse-1> 
<mouse-1> <down-mouse-1> <mouse-1> C-M-p C-p C-p C-p 
C-p C-p C-p C-p C-SPC C-n C-n C-c C-r n n n n n n n 
n n n n n n n n n n n n n n n n n n n n n n n n n n 
n n n n n n n n n n n n n n n n n n n n n n n n n n 
n n n n n n n C-p C-p C-SPC C-n C-n C-c C-r n n n n 
n n n n n n n n n n n n n n n n n n n n n n n n n n 
n n n n n n n n n n n n n n n n n n n n n n n n n n 
n n n n n n n n n n n C-a <return> C-p C-p C-p C-e 
C-n C-n C-o C-x C-f ~ / t v <return> e m a c <return> 
<return> c o m i <return> M-o s c r o l <return> M-o 
s c r o C-SPC o u t C-s <return> M-k M-k M-k M-k M-k 
M-k M-k C-n C-n C-n C-n C-n C-n C-n C-SPC C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n M-x k i l <return> 
C-x b C-g M-x e s s - v e r <return> M-x v e r s <return> 
M-x b u g - r e <M-backspace> <M-backspace> s e n d 
C-SPC b u g C-g M-x e m a c s C-SPC b u g <return>

Recent messages:
Opening TLS connection to `imap.gmail.com'...
Opening TLS connection with `gnutls-cli --insecure -p 993 
Opening TLS connection with `gnutls-cli --insecure -p 993 imap.gmail.com 
--protocols ssl3'...failed
Opening TLS connection with `openssl s_client -connect imap.gmail.com:993 
-no_ssl2 -ign_eof'...done
Opening TLS connection to `imap.gmail.com'...done
Mark set
ess-version : 12.09-1 [<unknown>]
GNU Emacs (i686-pc-linux-gnu, GTK+ Version 2.24.13) of 2012-11-15 on 

Load-path shadows:
/home/vitoshka/Dropbox/ELPA/magit-20121030.2025/.dir-locals hides 
/home/vitoshka/Dropbox/ELPA/magit-20121030.2025/.dir-locals hides 
~/VC/gnus/lisp/lpath hides ~/VC/auctex/lpath
/home/vitoshka/Dropbox/ELPA/popup-20121020.1203/popup hides ~/VC/popup-el/popup
~/VC/org-mode/lisp/org-remember hides 
~/VC/org-mode/lisp/org-protocol hides 
~/VC/org-mode/lisp/ob-dot hides /usr/local/share/emacs/24.2.50/lisp/org/ob-dot
~/VC/gnus/lisp/nnweb hides /usr/local/share/emacs/24.2.50/lisp/gnus/nnweb
~/VC/gnus/lisp/yenc hides /usr/local/share/emacs/24.2.50/lisp/gnus/yenc
~/VC/gnus/lisp/gnus-srvr hides 
/home/vitoshka/Dropbox/ELPA/rebox2-20121113.2100/rebox2 hides 

(shadow emacsbug edebug essddr helm-elisp helm-eval url-cache nnfolder
bbdb-message sendmail flymake qp shr-color color shr url-http url-auth
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iso-transl vc-dispatcher vc-svn helm-mode url-handlers smiley gnus-cite
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mm-uu mml2015 epg-config mm-view mml-smime smime dig bbdb-mua bbdb-com
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mail-source nnoo gnus-start gnus-spec gnus-int gnus-range message rfc822
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gnus gnus-ems gnus-compat nnheader mail-utils sunrise-x-popviewer
sunrise-x-checkpoints bookmark sunrise-x-modeline sunrise-x-loop
sunrise-x-tree sunrise-commander term ehelp electric hl-line find-dired
esh-var esh-io esh-cmd esh-opt esh-ext esh-proc esh-arg esh-groups
eshell esh-util esh-module esh-mode disp-table enriched desktop debug
view magithub crm json magit-bisect magit-key-mode magit sort smex
dabbrev skeleton helm-imenu misearch multi-isearch texmathp vc-git
preview prv-emacs tex-buf reftex-dcr zotelo flyspell ispell font-latex
latex tex-style tex dbus latexenc mule-util help-mode rainbow-delimiters
helm-misc helm-files image-dired dired-x dired-aux helm-tags
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url-parse url-vars ob-latex ob-R appt diary-lib diary-loaddefs org-clock
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iimage pos-tip ac-octave octave-inf octave-mod ac-math
auto-complete-config auto-complete popup saveplace doc-view jka-compr
image-mode reftex reftex-vars reftex-cite preview-latex tex-site
auto-loads info-look psvn log-edit pcvs-util add-log diff-mode elp
ediff-merg ediff-diff ediff-wind ediff-mult ediff-help ediff-init
ediff-util dired xquery-mode generic 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
smart-operator rx rebox2 warnings slime-media slime-presentations
slime-scratch slime-asdf slime-repl slime derived pp hyperspec menu-bar+
helm-descbinds helm-match-plugin helm helm-config mic-paren eldoc-eval
adaptive-wrap-autoloads bbdb-autoloads bm-autoloads bookmark+-autoloads
edit-server-autoloads eldoc-eval-autoloads esk-autoloads
flex-isearch-autoloads fuzzy-autoloads fuzzy-match-autoloads
git-blame-autoloads helm-autoloads helm-descbinds-autoloads
htmlize-autoloads ido-load-library-autoloads ido-ubiquitous-autoloads
ido-yes-or-no-autoloads igrep-autoloads jabber-autoloads
js2-mode-autoloads lacarte-autoloads magit-gh-pulls-autoloads
gh-autoloads logito-autoloads magit-push-remote-autoloads
magithub-autoloads magit-autoloads markdown-mode+-autoloads
markdown-mode-autoloads memory-usage-autoloads mic-paren-autoloads
minimap-autoloads oauth2-autoloads persistent-soft-autoloads
list-utils-autoloads pcache-autoloads finder-inf popup-autoloads
rainbow-delimiters-autoloads rainbow-mode-autoloads rebox2-autoloads
smex-autoloads stem-autoloads sunrise-commander-autoloads
synonyms-autoloads w3m-autoloads zotelo-autoloads package tramp
tramp-compat auth-source eieio byte-opt bytecomp byte-compile cconv
assoc gnus-util mm-util mail-prsvr password-cache tramp-loaddefs
format-spec ess-toolbar ess-mouse mouseme thingatpt browse-url ess-menu
ess-swv ess-noweb ess-noweb-font-lock-mode ess-bugs-l essd-els ess-sas-d
ess-sas-l ess-sas-a shell pcomplete ess-arc-d ess-vst-d ess-xls-d
ess-lsp-l ess-sta-d ess-sta-l cc-vars cc-defs make-regexp ess-sp6-d
ess-sp5-d ess-sp3-d ess-julia ess-r-d ess-tracebug compile ess-roxy
easy-mmode hideshow ess-help info reporter ess-developer ess-r-args
eldoc ess-s-l speedbar sb-image ezimage dframe ess ess-inf comint
ansi-color ring ess-mode ess-noweb-mode edmacro kmacro ess-utils
ess-custom ess-compat ess-site ibuf-ext ibuffer recentf tree-widget
wid-edit easymenu uniquify paren savehist time cus-start cus-load
solarized-dark-theme solarized imenu-anywhere cl-macs gv imenu iflipb
ido sh-script smie executable advice help-fns advice-preload autorevert
subword server cl cl-lib time-date tooltip ediff-hook vc-hooks
lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment lisp-mode register page menu-bar
rfn-eshadow timer select scroll-bar 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 minibuffer loaddefs button faces
cus-face macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
make-network-process dbusbind dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

--- End Message ---
--- Begin Message --- Subject: Re: bug#13248: [PATCH] bug#13248: 24.2.50; select-window moves point (in comint-postoutput-scroll-to-bottom) Date: Wed, 02 Jan 2013 09:03:09 +0100
Installed as revision 111344 on trunk.

Bug closed.

Thanks, martin

--- End Message ---

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