With GNOME 3.20, gnome-documents gains new functionality. It no logner converts
LO files using unoconv to .pdf and then renders them using poppler, but
actually uses the LOKit widgets directly.

For this to work, though, the LOKit needs to be packaged and made available.

Fedora's spec file seems to handle the installation manually:

install -m 0755 -d %{buildroot}%{_libdir}/girepository-1.0
install -m 0644 -p LOKDocView-%{girapiversion}.typelib
%{buildroot}%{_libdir}/girepository-1.0/LOKDocView-%{girapiversion}.typelib
install -m 0755 -d %{buildroot}%{_libdir}/gir-1.0
install -m 0644 -p gir-1.0/LOKDocView-%{girapiversion}.gir
%{buildroot}%{_libdir}/gir-1.0/LOKDocView-%{girapiversion}.gir

Packaging notice:
*.gir belong to a -devel package
*.typelib are to be split similar to SharedLibrary Packaging, one .typelib file
per package, see
https://en.opensuse.org/openSUSE:Packaging_guidelines#GObject_Introspection_Bindings_.28.typelibs.29

gobject-introspection is a mandatory build dependency in order to auto-generate
the correct provides / requires for the typelib-1_0-* packages