GNU logs - #20360, boring messages

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Subject: bug#20360: 24.4; Line Spacing Centering Incorrect
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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/ob-calc hides /usr/share/emacs/24.4/lisp/org/ob-calc
~/.emacs.d/lisp/org/lisp/org-crypt hides /usr/share/emacs/24.4/lisp/org/org-crypt
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> From: Renato Ferreira <renatofdds@HIDDEN>
> 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.

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From: Renato Ferreira <renatofdds@HIDDEN>
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Date: Fri, 17 Apr 2015 22:01:21 -0300
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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@HIDDEN> writes:

>> From: Renato Ferreira <renatofdds@HIDDEN>
>> 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.

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> From: Renato Ferreira <renatofdds@HIDDEN>
> 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.

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From: Renato Ferreira <renatofdds@HIDDEN>
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Date: Wed, 29 Apr 2015 09:05:00 -0300
In-Reply-To: <83bnil99xu.fsf@HIDDEN> (Eli Zaretskii's message of "Sat, 18 Apr
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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@HIDDEN> writes:

>> From: Renato Ferreira <renatofdds@HIDDEN>
>> 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.

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> From: Renato Ferreira <renatofdds@HIDDEN>
> 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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