Bug#923070: eom: can't handle wrong file extensions

[Adam Borowski <kilobyte@angband.pl>]

Package: eom
Version: 1.20.2-1+b1
Severity: wishlist

Hi!
Unlike most other programs, eom insists that a file ending in ".jpeg" is
indeed a JPEG, one ending in ".png" is indeed a PNG, etc.  That's the
"proper" way, right.  Alas, with eom's "competition" being more forgiving,
most people don't know the difference and thus mislabelling is rampant.

I see JPEG<->PNG confusion pretty often, and every single time I saw a
webp image (not yet supported by eom), it had a .jpg or .jpeg extension.

Thus, could you please either:
* give the proper image type in error message (rather than just "file is
  corrupted")
* just display the image, without any remark
* mention the error but display the image


Meow!
-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: arm64 (aarch64)

Kernel: Linux 4.4.154-1128-rockchip-ayufan-g61b4b1151f9a (SMP w/6 CPU cores)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE=C.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages eom depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.30.1-2
ii  eom-common                                   1.20.2-1
ii  libatk1.0-0                                  2.30.0-2
ii  libc6                                        2.28-7
ii  libcairo-gobject2                            1.16.0-3
ii  libcairo2                                    1.16.0-3
ii  libdbus-1-3                                  1.12.12-1
ii  libdbus-glib-1-2                             0.110-4
ii  libexempi8                                   2.5.0-2
ii  libexif12                                    0.6.21-5.1
ii  libgdk-pixbuf2.0-0                           2.38.0+dfsg-7
ii  libgirepository-1.0-1                        1.58.3-2
ii  libgl1                                       1.1.0-1
ii  libglib2.0-0                                 2.58.3-1
ii  libgtk-3-0                                   3.24.5-1
ii  libjpeg62-turbo                              1:1.5.2-2+b1
ii  liblcms2-2                                   2.9-3
ii  libmate-desktop-2-17                         1.20.4-2
ii  libpango-1.0-0                               1.42.4-6
ii  libpangocairo-1.0-0                          1.42.4-6
ii  libpeas-1.0-0                                1.22.0-4
ii  librsvg2-2                                   2.44.10-1
ii  librsvg2-common                              2.44.10-1
ii  libstartup-notification0                     0.12-6
ii  libx11-6                                     2:1.6.7-1
ii  libxml2                                      2.9.4+dfsg1-7+b3
ii  mate-desktop-common                          1.20.4-2
ii  shared-mime-info                             1.10-1
ii  zlib1g                                       1:1.2.11.dfsg-1

eom recommends no packages.

eom suggests no packages.

-- no debconf information