Bug#854134: lintian: Please add check for non .png icons used in .desktop files

[Laurent Bigonville <bigon@debian.org>]

Package: lintian
Version: 2.5.50
Severity: wishlist

Hi,

A check should maybe be added to verify that the icon specified in the
.desktop file exists in the hicolor theme in png format.

For example mutt sets the Icon key in its .desktop file but ships no
.png file in the hicolor theme. With gnome-shell it fallback to the .xpm
icon. (see: #854132)

A check could also verify that a big enough icon for nowdays standards
(48x48?) is provided.

Regards,

Laurent Bigonville

-- System Information:
Debian Release: 9.0
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=fr_BE.UTF-8, LC_CTYPE=fr_BE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages lintian depends on:
ii  binutils                          2.27.90.20170124-2
ii  bzip2                             1.0.6-8.1
ii  diffstat                          1.61-1
ii  file                              1:5.29-3
ii  gettext                           0.19.8.1-2
ii  intltool-debian                   0.35.0+20060710.4
ii  libapt-pkg-perl                   0.1.30
ii  libarchive-zip-perl               1.59-1
ii  libclass-accessor-perl            0.34-1
ii  libclone-perl                     0.38-2+b1
ii  libdpkg-perl                      1.18.22
ii  libemail-valid-perl               1.202-1
ii  libfile-basedir-perl              0.07-1
ii  libipc-run-perl                   0.94-1
ii  liblist-moreutils-perl            0.416-1+b1
ii  libparse-debianchangelog-perl     1.2.0-12
ii  libperl5.24 [libdigest-sha-perl]  5.24.1-1
ii  libtext-levenshtein-perl          0.13-1
ii  libtimedate-perl                  2.3000-2
ii  liburi-perl                       1.71-1
ii  libyaml-libyaml-perl              0.63-2
ii  man-db                            2.7.6.1-2
ii  patchutils                        0.3.4-2
ii  perl                              5.24.1-1
ii  t1utils                           1.39-2
ii  xz-utils                          5.2.2-1.2

Versions of packages lintian recommends:
ii  dpkg                                 1.18.22
ii  libautodie-perl                      2.29-2
ii  libperlio-gzip-perl                  0.19-1+b2
ii  perl                                 5.24.1-1
ii  perl-modules-5.24 [libautodie-perl]  5.24.1-1

Versions of packages lintian suggests:
pn  binutils-multiarch     <none>
ii  dpkg-dev               1.18.22
ii  libhtml-parser-perl    3.72-3
ii  libtext-template-perl  1.46-1

-- no debconf information