[Bug 1833498] Re: djvulibre mimetype definition is incorrect and not needed

[Tigran Aivazian]

The single-page format is not old or deprecated because that is what is
created by the current versions of c44/cjb2 utilities and there is no
way to change it. So, if your document happens to consist of a single
page, then what you get is a single page djvu. In fact, even if you
explicitly use the "multipage document manipulation utility" djvm -c
testm.djvu test.djvu, then the resulting file testm.djvu will be
absolutely identical to the original single page test.djvu. Therefore,
it is a serious mistake to consider single-page djvu documents as
"obsolete", as this breaks the functionality with no known workaround
(other than manually editing the evince-backend file). And djview
correctly handles both single and multipage djvu files, so evince should
do as well.

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https://bugs.launchpad.net/bugs/1833498

Title:
  djvulibre mimetype definition is incorrect and not needed

Status in djvulibre package in Ubuntu:
  New

Bug description:
  Every time I upgrade evince (as part of "sudo apt update; sudo apt
  upgrade") I have to remember to edit the file /usr/lib/x86_64-linux-
  gnu/evince/4/backends/djvudocument.evince-backend and add
  "image/vnd.djvu" to the end of MimeType list. If I don't do this then
  evince is unable to view djvu files. Please add "image/vnd.djvu" to
  MimeType in the official version of this file so that I (and
  presumably all other millions of Ubuntu Linux users, who are too lazy
  to open a bugreport for it) don't have to edit it manually. Thank you.

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