bug#21331: 24.5; LibreOffice documents have less support than Microsoft Office docs (in Gnus?)

[N. Jackson]

In the Gnus (v5.13) Article buffer, clicking or RET on an attachment has
different behaviour depending upon the type of document:

- Microsoft Office files with .doc, .xls etc. extensions get opened (in
LibreOffice on my system) which is the desired behaviour.

- But for LibreOffice files with .odt, .ods etc. extensions, Gnus just
offers to save the file.

Other actions on the attachments can be accessed by right clicking on
them (and probably in other ways), but for the LibreOffice files, there
does not seem to be an option for opening them.

Support for LibreOffice files probably ought to be at least as good as
the support for Microsoft Office files.

(Note: Newer-format Microsoft Office files (with .docx, .xlsx
etc. extensions) seem to have the same lack of support for opening as the
LibreOffice files, and it would be nice if these too could be opened.)

For a concrete example, with the following email from myself in the
Article buffer

    From: nljlistbox2@gmail.com (N. Jackson)
    Subject: Test of office suite files
    To: nljlistbox2@gmail.com
    Date: Sun, 23 Aug 2015 12:34:53 -0300 (1 hour, 20 minutes, 58 seconds ago)

    [1. An .odt format file --- application/vnd.oasis.opendocument.text; 
mydocument.odt]...

    [2. An .doc format file --- application/msword; mydocument.doc]...

    [3. An .docx format file --- 
application/vnd.openxmlformats-officedocument.wordprocessingml.document; 
mydocument.docx]...

If I hit RET on the second attachment (the old-format Word file) it is
opened in LibreOffice, but RET on the other two attachments just results
in a prompt to save them.

[To provide a more complete bug report (and with the thought of maybe
attempting a patch) I tried to track this functionality down, but
unfortunately its implementation is a little beyond my current level of
understanding. C-h k RET here reports

    RET runs the command gnus-article-press-button, which is an
    interactive compiled Lisp function in `gnus-art.el'.

    It is bound to RET, <menu-bar> <MIME Part> <Toggle Display>.

    (gnus-article-press-button)

    Check text at point for a callback function.
    If the text at point has a `gnus-callback' property,
    call it with the value of the `gnus-data' text property.

and I don't know (yet) how to extract text property information.]


In GNU Emacs 24.5.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.14.15)
 of 2015-08-18 on moondust
Windowing system distributor `Fedora Project', version 11.0.11603000
System Description:     Fedora release 21 (Twenty One)

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

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.utf8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Group

Minor modes in effect:
  gnus-agent-group-mode: t
  gnus-undo-mode: t
  recentf-mode: t
  delete-selection-mode: t
  show-paren-mode: t
  savehist-mode: t
  electric-pair-mode: t
  display-time-mode: t
  display-battery-mode: t
  desktop-save-mode: t
  cua-mode: t
  tooltip-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
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  transient-mark-mode: t

Recent messages:
Quit [4 times]
Beginning of buffer [2 times]
Updating buffer list...done
Commands: m, u, t, RET, g, k, S, D, Q; q to quit; h for help
Mark set
Mark saved where search started [2 times]
Mark set
Mark saved where search started
Mark set [2 times]
call-interactively: End of buffer [4 times]

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cua-base cus-start cus-load 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 719885 118812)
 (symbols 48 64851 55)
 (miscs 40 7690 4433)
 (strings 32 152039 25808)
 (string-bytes 1 5063848)
 (vectors 16 54839)
 (vector-slots 8 1784948 101564)
 (floats 8 949 1582)
 (intervals 56 26773 2270)
 (buffers 960 147)
 (heap 1024 152883 22894))