bug#19194: 24.4.50; `window-body-width' is not dynamic relative to font size changes

[Joe Corneli]

Adjusting the font size, I would expect that the window's "body width"
would change -- more characters can be fit into the same amount of
screen space.  Current behaviour does not match this expectation.

M-: (window-body-width) RET  [Note result.]
C-x C--
M-: (window-body-width) RET  [Result is the same.]

The function is described:

"This function returns the width, in columns, of the body of window
window."

If for some reason the "nominal" number of columns needs to calculated
with reference to the default font, then there should be another
function to return the "actual" number of columns.

( I note one practical implication of the underlying issue here:
https://github.com/kiwanami/emacs-calfw/issues/45 )




In GNU Emacs 24.4.50.2 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2014-09-01 on Teacup
Repository revision: 117795 rgm@gnu.org-20140901102126-izlwuvh1vuig41nf
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:     Ubuntu 14.04.1 LTS

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GSETTINGS NOTIFY GNUTLS
LIBXML2 FREETYPE XFT ZLIB

Important settings:
  value of $LC_MONETARY: en_GB.UTF-8
  value of $LC_NUMERIC: en_GB.UTF-8
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_GB.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix

Major mode: Shell

Minor modes in effect:
  shell-dirtrack-mode: t
  openwith-mode: t
  show-paren-mode: t
  tooltip-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t

Recent input:
<up> <left> D M C-g C-x 1 C-x C-b C-x o <down> <down> 
<down> <return> C-x 1 <up> <C-left> C-s C-w C-w C-w 
C-s C-s C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-l <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> C-e M-x <up> C-g C-M-x 
e C-/ M-x e f d e b u <backspace> <backspace> <backspace> 
<backspace> <backspace> d e b u <tab> d e f <tab> <return> 
M-x <up> <up> <up> <return> n n n n n n n n n n n n 
n n n q <up> <up> <up> <up> <up> <up> M-b <left> <left> 
<left> <up> <up> <up> <up> <up> <C-left> C-r C-w C-w 
C-w C-r C-r C-r C-r C-r C-r C-r C-r C-r C-r C-r C-r 
C-r C-r <left> <right> C-SPC <C-right> M-w M-x g r 
e p <return> " C-y " SPC * <return> C-x o <down> <down> 
<down> <down> <return> C-e M-b M-b M-f C-h f <return> 
C-x o C-v C-l <up> <up> <up> <up> <up> C-l C-x C-b 
C-x o <down> <down> <down> <down> <down> C-g M-x <up> 
<up> <return> q M-x <up> <return> C-l <C-right> C-e 
C-x C-e M-x <up> <return> M-: <pause> C-y <return> 
M-: <up> <return> C-h v <up> C-e <M-backspace> b o 
d <tab> y C-g C-h f w i n d o w - b o d <tab> w <tab> 
<return> C-x b <return> C-a <right> <right> <right> 
<right> <right> <right> <left> <left> <help-echo> <help-echo> 
<S-down-mouse-1> M-: <up> <return> <S-down-mouse-1> 
M-x <up> <up> <up> <down> <down> C-g M-: <up> <return> 
C-x o M-x r e p o <tab> C-g C-z C-x 1 e m a c s SPC 
- Q <return> M-: <up> C-SPC C-e M-w C-g C-c C-c M-x 
r e p o <tab> r <tab> <return>

Recent messages:
cfw:view-month-calc-param
89 (#o131, #x59, ?Y) [2 times]
Quit
Type "q" to restore previous buffer, M-x scroll-up to scroll help.
89 (#o131, #x59, ?Y)
Quit
89 (#o131, #x59, ?Y)
Making completion list...
Quit [2 times]
Making completion list...

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~/org-mode/lisp/org-loaddefs hides 
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~/org-mode/lisp/org-ctags hides 
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~/org-mode/lisp/org-docview hides 
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Features:
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starttls url-http url-gw url-auth url-queue url-cache shr-color
mule-util shell poly-markdown polymode pcase poly-base polymode-weave
polymode-export polymode-methods polymode-classes polymode-common
eieio-custom eieio-base color markdown-mode thingatpt openwith joes-dict
dictem calfw-org org-capture calfw holidays hol-loaddefs htmlize
convenience joes-dired-config ls-lisp joes-buffer-menu-config joes-eww
eww mm-url url url-proxy url-privacy url-expand url-methods url-history
url-cookie url-domsuf url-util url-parse url-vars mailcap joes-org-mode
ox-s5 org-agenda ox-latex ox-icalendar ox-html ox-ascii ox-publish ox
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gnus-cloud nnimap nnmail mail-source tls utf7 netrc nnoo parse-time
gnus-spec gnus-int gnus-range gnus-win gnus gnus-ems nnheader wid-edit
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org-src ob-ref ob-lob ob-table ob-keys ob-exp ob-comint ob-core ob-eval
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cal-loaddefs shr smtpmail-multi mu4e mu4e-speedbar speedbar sb-image
ezimage dframe mu4e-main mu4e-view epa derived epg epg-config browse-url
comint ansi-color ring mu4e-headers mu4e-compose mu4e-draft mu4e-actions
ido rfc2368 smtpmail auth-source eieio byte-opt bytecomp byte-compile
cconv eieio-core gnus-util password-cache sendmail mu4e-mark
mu4e-message html2text mu4e-proc mu4e-utils doc-view jka-compr
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format-spec rfc822 mml easymenu mml-sec mm-decode mm-bodies mm-encode
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generic generic-x advice help-fns edmacro kmacro cl-loaddefs cl-lib
paren 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
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hashtable-print-readable backquote make-network-process gfilenotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)

Memory information:
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 (symbols 48 45326 4)
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 (strings 32 104101 9049)
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