...from <https://github.com/flathub/org.libreoffice.LibreOffice/>:

commit 945f6caad87658b1df1e8918bd5f64939058ab7f (origin/desktop-integration)
Author: Robert McQueen <rob@endlessm.com>
Date:   Fri Apr 27 16:54:30 2018 +0100

    clean up desktop integration

     - don't register MIME handler for text/plain (Flatpak appears first in
       XDG_DATA_DIRS so otherwise we "steal" the default text editor association)
     - copy the icons app into the theme with both their original libreoffice-*
       name as well as the org.libreoffice name needed by Flatpak, which fixes the
       window icons
     - append the appdata for the separate apps (Base, Draw, etc) to the appdata
       XML we export for Flatpak, so they are visible in software centers etc

Change-Id: Ia086071671b9ff5a8b07c55a822240f9e8fbb8d3
Reviewed-on: https://gerrit.libreoffice.org/54031Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
(cherry picked from commit 33af02a4)