bug#23847: 24.5; dired icon too large

[sanette-linux <sanette-linux@laposte.net>]

Hi

When starting emacs in a graphical ubuntu 16.04 session, the "dired"
icon in the toolbar is much larger than the other ones, making the
result quite ugly.
It might be related to the fact that I have a hi-dpi display and set
scale=2 in the unity Display setting. However, other icons in the
toolbar have the right size, therefore there surely is something wrong.





In GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
  of 2016-04-17 on lgw01-04, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11803000
System Description:    Ubuntu 16.04 LTS

Configured using:
  `configure --build x86_64-linux-gnu --prefix=/usr
  --sharedstatedir=/var/lib --libexecdir=/usr/lib
  --localstatedir=/var/lib --infodir=/usr/share/info
  --mandir=/usr/share/man --with-pop=yes
  --enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.5/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.5/site-lisp:/usr/share/emacs/site-lisp
  --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
  --libexecdir=/usr/lib --localstatedir=/var/lib
  --infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes
  --enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.5/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.5/site-lisp:/usr/share/emacs/site-lisp
  --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars
  'CFLAGS=-g -O2 -fstack-protector-strong -Wformat
  -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
  -D_FORTIFY_SOURCE=2' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Important settings:
   value of $LANG: fr_FR.UTF-8
   value of $XMODIFIERS: @im=ibus
   locale-coding-system: utf-8-unix

Major mode: Python

Minor modes in effect:
   shell-dirtrack-mode: t
   tooltip-mode: t
   electric-indent-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-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t
   line-number-mode: t
   transient-mark-mode: t

Recent messages:
Mark set [6 times]
Mark saved where search started
Saving file /media/san/linux/5 min 
Lebesgue/2016-06-21_Christophe/titre.py...
Wrote /media/san/linux/5 min Lebesgue/2016-06-21_Christophe/titre.py
<f5> is undefined
Making completion list...
No match
<backtab> is undefined [2 times]
No match
<backtab> is undefined [2 times]

Load-path shadows:
/usr/share/emacs/24.5/site-lisp/debian-startup hides 
/usr/share/emacs/site-lisp/debian-startup

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
help-fns mail-prsvr mail-utils term disp-table ehelp shell pcomplete
help-mode misearch multi-isearch python easymenu json comint ring
cl-loaddefs cl-lib ansi-color 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 94205 9952)
  (symbols 48 19284 0)
  (miscs 40 87 339)
  (strings 32 14730 3963)
  (string-bytes 1 432803)
  (vectors 16 11398)
  (vector-slots 8 405884 5042)
  (floats 8 68 675)
  (intervals 56 1622 16)
  (buffers 960 15)
  (heap 1024 41824 889))