bug#23039: 25.0.92; New Emacs icon blurry in GNOME on Fedora

[N. Jackson]

The new Emacs icon is displayed with a fuzzy out-of-focus appearance.

The effect is especially noticeable when "Alt-Tab switching" between
applications, where I find myself squinting to try (unsuccessfully) to
bring the Emacs icons into focus. The attached screenshot shows the
problem, although the image doesn't do justice to the severity of the
problem in real life.

Strangely, the effect is not so noticeable (not noticeable at all
really) when looking at the individual .png files of the icons. But
when they are displayed beside the icons from other applications, it's
almost as if the focus distance to the Emacs icons is different from
that of the other icons. [Some of the other icons (e.g. Icecat) are
fuzzy from being pixellated, but at least the pixellation is in focus
so I don't find myself wanting to run off to see the oculist!]

(This is with GNOME Version 3.18.2 on Fedora 23 with the default
Adwaita theme.)

fuzzy-icons.png
Description: Fuzzy Emacs icons.

In GNU Emacs 25.0.92.2 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.9)
 of 2016-03-17 built on moondust
Windowing system distributor 'Fedora Project', version 11.0.11801000
System Description:     Fedora release 23 (Twenty Three)

Configured using:
 'configure --prefix=/home/nlj/local/ --enable-checking=yes,glyphs
 'CFLAGS=-O0 -g3 -ggdb''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_MONETARY: en_DK.utf8
  value of $LC_NUMERIC: en_DK.utf8
  value of $LC_TIME: en_DK.utf8
  value of $LANG: en_CA.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Group

Minor modes in effect:
  gnus-undo-mode: t
  recentf-mode: t
  display-battery-mode: t
  display-time-mode: t
  delete-selection-mode: t
  show-paren-mode: t
  savehist-mode: t
  save-place-mode: t
  electric-pair-mode: t
  desktop-save-mode: t
  cua-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-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
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent messages:
Opening nnfolder server on archive...done
Reading active file from archive via nnfolder...done
Reading active file via nnfolder...
Opening nnfolder server...done
Reading incoming mail from file...
nnfolder: Reading incoming mail (no new mail)...done
Reading active file via nnfolder...done
Checking new news...done
Auto-saving...
Mark saved where search started

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Features:
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sort emms-playlist-sort emms-last-played emms-player-xine
emms-player-mpd tq emms-playing-time emms-lyrics emms-url url url-proxy
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dbusbind inotify dynamic-setting system-font-setting font-render-setting
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Memory information:
((conses 16 443485 30338)
 (symbols 48 93276 0)
 (miscs 40 2198 6869)
 (strings 32 132455 7944)
 (string-bytes 1 4387453)
 (vectors 16 40090)
 (vector-slots 8 879416 6387)
 (floats 8 545 619)
 (intervals 56 2813 0)
 (buffers 976 38)
 (heap 1024 83561 15780))