GNU bug report logs - #20360
24.4; Line Spacing Centering Incorrect

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

From: Renato Ferreira <renatofdds <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.4; Line Spacing Centering Incorrect
Date: Fri, 17 Apr 2015 03:41:58 -0300

When using line-spacing (> 0) custom variable, space is added ONLY AFTER the
line's content instead of CENTERING the line contents inside the space
added.

Space should be distributed around the contents.

The ideal spacing can be achieved by something like:
(add-text-properties (point-min) (point-max) '(line-spacing 2
                     line-height 1.1))

on mode change hook, but thats a hack, changes the text (triggers dirty
buffer) and its prone to bugs due to influence by other modes (like AC).




In GNU Emacs 24.4.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.14.7)
 of 2015-01-17 on bisson
Windowing system distributor `The X.Org Foundation', version 11.0.11701000
Configured using:
 `configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
 --param=ssp-buffer-size=4' CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
  diff-auto-refine-mode: t
  eldoc-mode: t
  ido-ubiquitous-mode: t
  global-semanticdb-minor-mode: t
  global-semantic-idle-scheduler-mode: t
  semantic-idle-scheduler-mode: t
  semantic-decoration-mode: t
  global-semantic-decoration-mode: t
  shell-dirtrack-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  show-paren-mode: t
  server-mode: t
  semantic-highlight-func-mode: t
  global-semantic-highlight-func-mode: t
  semantic-mode: t
  savehist-mode: t
  recentf-mode: t
  ido-vertical-mode: t
  guide-key-mode: t
  gud-tooltip-mode: t
  google-this-mode: t
  global-subword-mode: t
  subword-mode: t
  global-smartscan-mode: t
  smartscan-mode: t
  hl-line-mode: t
  global-git-gutter-mode: t
  git-gutter-mode: t
  global-flycheck-mode: t
  flycheck-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  flx-ido-mode: t
  ido-everywhere: t
  electric-pair-mode: t
  desktop-save-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-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
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-x C-r p o w e r <return> C-x C-f C-n C-n C-n C-f 
C-s h e i g h t C-n C-n C-n C-n C-p C-p C-p C-p M-n 
M-n M-n M-p M-n M-n M-p M-p M-n M-n M-p C-p C-n M-f 
M-f M-f M-n M-p C-f C-f C-f C-f C-f C-f C-f C-f C-f 
C-f C-f C-f C-f C-f C-f C-f C-f C-f C-x C-e M-b M-b 
M-b C-b C-b C-x C-e C-p C-p M-n M-n M-p M-p M-p C-n 
C-n M-n M-n M-n M-p M-p M-p M-n M-n M-e C-s h e i g 
h t C-s C-s C-s C-s C-s C-s C-s C-s C-s C-s C-s C-s 
C-s C-s C-s C-s C-s C-s C-s M-0 M-0 M-0 M-0 M-0 M-0 
M-0 C-x C-r i n i <return> C-x C-r h o C-n <return> 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-a C-f C-f C-f C-f C-f C-f C-f C-f 
C-f | G <backspace> O <backspace> <backspace> C-c C-b 
C-c b C-x b C-g <f1> C-g <f1> w e m a c s b u C-n <return> 
M-x C-g C-x C-s C-/ C-/ C-/ C-/ C-/ C-/ C-x C-s C-s 
C-s C-s C-s C-g C-g C-x v n C-x C-g C-x v = M-o q C-x 
v = M-o q C-p C-p C-M-h <tab> C-n C-x C-s M-x s e n 
a b u g <M-backspace> e m a c s b u g C-n <return>

Recent messages:
Mark set [2 times]
Indenting region...done
(No changes need to be saved)

Load-path shadows:
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~/.emacs.d/lisp/org/lisp/ox-md hides /usr/share/emacs/24.4/lisp/org/ox-md
~/.emacs.d/lisp/org/lisp/org-indent hides /usr/share/emacs/24.4/lisp/org/org-indent
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~/.emacs.d/lisp/org/lisp/ob-shen hides /usr/share/emacs/24.4/lisp/org/ob-shen
~/.emacs.d/lisp/org/lisp/org-w3m hides /usr/share/emacs/24.4/lisp/org/org-w3m
~/.emacs.d/lisp/org/lisp/ob-sass hides /usr/share/emacs/24.4/lisp/org/ob-sass
~/.emacs.d/lisp/org/lisp/ob-lilypond hides /usr/share/emacs/24.4/lisp/org/ob-lilypond
~/.emacs.d/lisp/org/lisp/ob-octave hides /usr/share/emacs/24.4/lisp/org/ob-octave
~/.emacs.d/lisp/org/lisp/org-feed hides /usr/share/emacs/24.4/lisp/org/org-feed
~/.emacs.d/lisp/org/lisp/org-datetree hides /usr/share/emacs/24.4/lisp/org/org-datetree
~/.emacs.d/lisp/org/lisp/org-clock hides /usr/share/emacs/24.4/lisp/org/org-clock
~/.emacs.d/lisp/org/lisp/ob-tangle hides /usr/share/emacs/24.4/lisp/org/ob-tangle
~/.emacs.d/lisp/org/lisp/org-colview hides /usr/share/emacs/24.4/lisp/org/org-colview
~/.emacs.d/lisp/org/lisp/org-mhe hides /usr/share/emacs/24.4/lisp/org/org-mhe
~/.emacs.d/lisp/org/lisp/org-macs hides /usr/share/emacs/24.4/lisp/org/org-macs
~/.emacs.d/lisp/org/lisp/ox-latex hides /usr/share/emacs/24.4/lisp/org/ox-latex
~/.emacs.d/lisp/org/lisp/org-footnote hides /usr/share/emacs/24.4/lisp/org/org-footnote
~/.emacs.d/lisp/org/lisp/ox-publish hides /usr/share/emacs/24.4/lisp/org/ox-publish
~/.emacs.d/lisp/org/lisp/org-inlinetask hides /usr/share/emacs/24.4/lisp/org/org-inlinetask
~/.emacs.d/lisp/org/lisp/ob-asymptote hides /usr/share/emacs/24.4/lisp/org/ob-asymptote
~/.emacs.d/lisp/org/lisp/org-protocol hides /usr/share/emacs/24.4/lisp/org/org-protocol
~/.emacs.d/lisp/org/lisp/ob-keys hides /usr/share/emacs/24.4/lisp/org/ob-keys
~/.emacs.d/lisp/org/lisp/org-pcomplete hides /usr/share/emacs/24.4/lisp/org/org-pcomplete
~/.emacs.d/lisp/org/lisp/ob-python hides /usr/share/emacs/24.4/lisp/org/ob-python
~/.emacs.d/lisp/org/lisp/org-id hides /usr/share/emacs/24.4/lisp/org/org-id
~/.emacs.d/lisp/org/lisp/ob-scheme hides /usr/share/emacs/24.4/lisp/org/ob-scheme
~/.emacs.d/lisp/org/lisp/ob-sqlite hides /usr/share/emacs/24.4/lisp/org/ob-sqlite
~/.emacs.d/lisp/org/lisp/org-element hides /usr/share/emacs/24.4/lisp/org/org-element
~/.emacs.d/lisp/org/lisp/ob-latex hides /usr/share/emacs/24.4/lisp/org/ob-latex
~/.emacs.d/lisp/org/lisp/ob-matlab hides /usr/share/emacs/24.4/lisp/org/ob-matlab
~/.emacs.d/lisp/org/lisp/ob-perl hides /usr/share/emacs/24.4/lisp/org/ob-perl
~/.emacs.d/lisp/org/lisp/ob-eval hides /usr/share/emacs/24.4/lisp/org/ob-eval
~/.emacs.d/lisp/org/lisp/ob-exp hides /usr/share/emacs/24.4/lisp/org/ob-exp
~/.emacs.d/lisp/org/lisp/org hides /usr/share/emacs/24.4/lisp/org/org
~/.emacs.d/lisp/org/lisp/ob-table hides /usr/share/emacs/24.4/lisp/org/ob-table
~/.emacs.d/lisp/org/lisp/org-mobile hides /usr/share/emacs/24.4/lisp/org/org-mobile
~/.emacs.d/lisp/org/lisp/ox-ascii hides /usr/share/emacs/24.4/lisp/org/ox-ascii
~/.emacs.d/lisp/org/lisp/ob-haskell hides /usr/share/emacs/24.4/lisp/org/ob-haskell
~/.emacs.d/lisp/org/lisp/ob-ocaml hides /usr/share/emacs/24.4/lisp/org/ob-ocaml
~/.emacs.d/lisp/org/lisp/ob hides /usr/share/emacs/24.4/lisp/org/ob
~/.emacs.d/lisp/org/lisp/ob-scala hides /usr/share/emacs/24.4/lisp/org/ob-scala
~/.emacs.d/lisp/org/lisp/org-macro hides /usr/share/emacs/24.4/lisp/org/org-macro
~/.emacs.d/lisp/org/lisp/org-bbdb hides /usr/share/emacs/24.4/lisp/org/org-bbdb
~/.emacs.d/lisp/org/lisp/org-version hides /usr/share/emacs/24.4/lisp/org/org-version
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~/.emacs.d/lisp/org/lisp/org-gnus hides /usr/share/emacs/24.4/lisp/org/org-gnus
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~/.emacs.d/lisp/org/lisp/org-irc hides /usr/share/emacs/24.4/lisp/org/org-irc
~/.emacs.d/lisp/org/lisp/ob-ref hides /usr/share/emacs/24.4/lisp/org/ob-ref
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~/.emacs.d/lisp/org/lisp/ob-picolisp hides /usr/share/emacs/24.4/lisp/org/ob-picolisp
~/.emacs.d/lisp/org/lisp/org-entities hides /usr/share/emacs/24.4/lisp/org/org-entities
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~/.emacs.d/lisp/org/lisp/ob-ruby hides /usr/share/emacs/24.4/lisp/org/ob-ruby
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~/.emacs.d/lisp/org/lisp/org-docview hides /usr/share/emacs/24.4/lisp/org/org-docview

Features:
(shadow sort bbdb-message mail-extr emacsbug message rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 gmm-utils mailheader
sendmail rfc2047 rfc2045 ietf-drums diff-mode view smex align tabify
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semantic/decorate/include misearch multi-isearch pcase eldoc inversion
semantic/db-global semantic/symref/global semantic/symref cedet-global
bbdb-mua bbdb-com crm mailabbrev ido-ubiquitous ido-completing-read+
auto-complete-c-headers auto-complete-clang org-mobile ox-odt rng-loc
rng-uri rng-parse rng-match rng-dt rng-util rng-pttrn nxml-parse nxml-ns
nxml-enc xmltok nxml-util ox-latex ox-icalendar ox-html ox-ascii
ox-publish ox semantic/db-file data-debug cedet-files semantic/bovine/c
hideif cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align
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semantic/idle semantic/format semantic/ctxt semantic/decorate/mode
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tramp-sh tramp tramp-compat tramp-loaddefs trampver shell vc-git flymake
compile org-pomodoro alert log4e notifications dbus xml gntp org-timer
org-clock org-checklist org-bullets org-w3m org-mouse org-irc org-info
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semantic/util-modes semantic/util semantic semantic/tag semantic/lex
semantic/fw mode-local savehist recentf tree-widget ido-vertical-mode
guide-key s ucs-normalize popwin gud google-this url url-proxy
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mailcap gnus gnus-ems nnheader mail-utils superword subword smartscan
hl-line git-gutter flycheck help-mode rx subr-x dash ede/speedbar
ede/files ede ede/base ede/auto ede/source eieio-base eieio-speedbar
speedbar sb-image ezimage dframe eieio-custom wid-edit cedet
auto-complete cl-macs gv popup flx-ido flx ido warnings elec-pair
desktop frameset delsel cus-start cus-load org-location-google-maps
org-agenda google-maps google-maps-static url-util url-parse auth-source
eieio byte-opt bytecomp byte-compile cconv eieio-core gnus-util mm-util
mail-prsvr password-cache url-vars google-maps-geocode google-maps-base
json advice help-fns info package epg-config org org-macro org-footnote
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ob-exp org-src ob-keys ob-comint comint ansi-color ring ob-core ob-eval
org-compat org-macs org-loaddefs format-spec find-func cal-menu easymenu
calendar cal-loaddefs edmacro kmacro cl-loaddefs cl-lib time-date
tooltip electric uniquify 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 prog-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 nadvice 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 gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 774051 206455)
 (symbols 48 55974 5)
 (miscs 40 859 828)
 (strings 32 142514 134626)
 (string-bytes 1 4289208)
 (vectors 16 111334)
 (vector-slots 8 3085914 59854)
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 (intervals 56 2031 2955)
 (buffers 960 17)
 (heap 1024 103983 16154))

Message #8 received at 20360 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Renato Ferreira <renatofdds <at> gmail.com>
Cc: 20360 <at> debbugs.gnu.org
Subject: Re: bug#20360: 24.4; Line Spacing Centering Incorrect
Date: Fri, 17 Apr 2015 19:20:35 +0300

> From: Renato Ferreira <renatofdds <at> gmail.com>
> Date: Fri, 17 Apr 2015 03:41:58 -0300
> 
> When using line-spacing (> 0) custom variable, space is added ONLY AFTER the
> line's content instead of CENTERING the line contents inside the space
> added.

Yes, that's how this feature was designed and implemented.

Message #11 received at 20360 <at> debbugs.gnu.org (full text, mbox):

From: Renato Ferreira <renatofdds <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 20360 <at> debbugs.gnu.org
Subject: Re: bug#20360: 24.4; Line Spacing Centering Incorrect
Date: Fri, 17 Apr 2015 22:01:21 -0300

IMHO it would look so much better with the centered content, that's why
most other programs implement it that way. It looks too terrible only
after the content, specially with things like highlight and boxing.

Is there no possible way to change it ? Do you suggest any good
workaround ?

Thank you very much for the answer in advance.

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

>> From: Renato Ferreira <renatofdds <at> gmail.com>
>> Date: Fri, 17 Apr 2015 03:41:58 -0300
>> 
>> When using line-spacing (> 0) custom variable, space is added ONLY AFTER the
>> line's content instead of CENTERING the line contents inside the space
>> added.
>
> Yes, that's how this feature was designed and implemented.

Message #14 received at 20360 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Renato Ferreira <renatofdds <at> gmail.com>
Cc: 20360 <at> debbugs.gnu.org
Subject: Re: bug#20360: 24.4; Line Spacing Centering Incorrect
Date: Sat, 18 Apr 2015 10:23:25 +0300

> From: Renato Ferreira <renatofdds <at> gmail.com>
> Cc: 20360 <at> debbugs.gnu.org
> Date: Fri, 17 Apr 2015 22:01:21 -0300
> 
> IMHO it would look so much better with the centered content, that's why
> most other programs implement it that way. It looks too terrible only
> after the content, specially with things like highlight and boxing.
> 
> Is there no possible way to change it ? Do you suggest any good
> workaround ?

Doing that would require changes on the C level, because line spacing
is implemented in the display engine.  AFAICS, it looks like a simple
change, but Someone(TM) should describe the details of how
line-spacing should be distributed between above and below the base
character line, because I have no idea what is TRT here.

Also, I don't know whether any packages out there rely on the current
implementation; if they do, we will have to introduce an option to
control this behavior, so that the old behavior could be preserved if
needed.

Message #17 received at 20360 <at> debbugs.gnu.org (full text, mbox):

From: Renato Ferreira <renatofdds <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 20360 <at> debbugs.gnu.org
Subject: Re: bug#20360: 24.4; Line Spacing Centering Incorrect
Date: Wed, 29 Apr 2015 09:05:00 -0300

Hello Eli, thanks for looking into it!

I think a great description of how it should be implemented can be found
here:
http://www.dev-archive.net/articles/line-height.html

Which is based on the CSS specifications.

I don't know either if any packages rely on it but i think if it did the
change would be aesthetically better in every case i can think of so IMHO
the implementation doesn't have to provide backwards compat.

Thanks again!
Renato

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

>> From: Renato Ferreira <renatofdds <at> gmail.com>
>> Cc: 20360 <at> debbugs.gnu.org
>> Date: Fri, 17 Apr 2015 22:01:21 -0300
>> 
>> IMHO it would look so much better with the centered content, that's why
>> most other programs implement it that way. It looks too terrible only
>> after the content, specially with things like highlight and boxing.
>> 
>> Is there no possible way to change it ? Do you suggest any good
>> workaround ?
>
> Doing that would require changes on the C level, because line spacing
> is implemented in the display engine.  AFAICS, it looks like a simple
> change, but Someone(TM) should describe the details of how
> line-spacing should be distributed between above and below the base
> character line, because I have no idea what is TRT here.
>
> Also, I don't know whether any packages out there rely on the current
> implementation; if they do, we will have to introduce an option to
> control this behavior, so that the old behavior could be preserved if
> needed.

Message #20 received at 20360 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Renato Ferreira <renatofdds <at> gmail.com>
Cc: 20360 <at> debbugs.gnu.org
Subject: Re: bug#20360: 24.4; Line Spacing Centering Incorrect
Date: Wed, 29 Apr 2015 22:26:56 +0300

> From: Renato Ferreira <renatofdds <at> gmail.com>
> Cc: 20360 <at> debbugs.gnu.org
> Date: Wed, 29 Apr 2015 09:05:00 -0300
> 
> Hello Eli, thanks for looking into it!
> 
> I think a great description of how it should be implemented can be found
> here:
> http://www.dev-archive.net/articles/line-height.html
> 
> Which is based on the CSS specifications.

Thanks, I will take a look when I have time.

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