[Pkg-utopia-maintainers] xdg-desktop-portal-gtk is installed when user specifies to install xdg-desktop-portal-kde with flatpak

[Andrew Hayzen]

Hey,

Thanks for the detailed and quick response !

Yes, while the xdg-desktop-portal is still being developed at a fast
pace, it probably does make sense to still have the -gtk one installed
for the reasons you stated. Thanks for pointing that out.

I see that the change has been made here [0] (thanks!), if a release of
the change is made I can request it to be synced into cosmic. Also I'll
take a look at if a SRU into bionic is possible.

Thanks,

Andrew

0 - https://salsa.debian.org/qt-kde-team/kde/xdg-desktop-portal-kde/com
mit/85ceb42c31784be7b3a57d2032a37be4441375b2


On Thu, 2018-09-20 at 23:16 +0100, Simon McVittie wrote:
> On Thu, 20 Sep 2018 at 22:23:37 +0100, Andrew Hayzen wrote:
> > tl;dr; Should xdg-desktop-portal-kde provide xdg-deskop-portal-
> > backend?
> 
> Presumably. If it's a valid implementation of the same interfaces as
> xdg-desktop-portal-gtk (installs
> /usr/share/xdg-desktop-portal/portals/*.portal listing various
> interfaces of the form org.freedesktop.impl.portal.Foo) then it
> should implement the virtual package.
> 
> I was about to report a bug, but
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=890910 already
> exists.
> 
> > From my understanding of xdg-desktop-portal, one only needs a
> > single
> > backend installed - either the -gtk or -kde - depending which
> > desktop
> > environment they want the portals to feel integrated into.
> 
> Almost, although it isn't quite that simple. There are several
> interfaces
> that can be provided (FileChooser, Print, Screenshot and so on). For
> each one, xdg-desktop-portal tries to find the most appropriate
> backend:
> 
> - the first backend in alphabetical order where UseIn matches
>   XDG_CURRENT_DESKTOP (e.g. -gtk has UseIn=gnome) that
>   provides the interface;
> - or if there is no matching backend, the first backend in
> alphabetical
>   order that provides the interface
> 
> So on KDE (assuming you have UseIn=kde, or plasma, or whatever KDE
> uses
> for XDG_CURRENT_DESKTOP) you'll generally get the -kde backend -
> unless
> there are (new?) interfaces that are only implemented in the -gtk
> backend,
> in which case you'll get the -gtk implementation of those interfaces
> (if -gtk is also installed) and the -kde implementation of the rest.
> 
> -gtk is the default implementation of the virtual package, because
> it's basically the reference implementation (it's maintained by the
> same people as flatpak and the desktop-agnostic x-d-p frontend) and
> it
> should fit reasonably well into multiple desktop environments (GNOME,
> XFCE, LXDE and the various GNOME forks like MATE and Cinnamon).
> 
> It should be harmless to have both -gtk and -kde installed, other
> than wasting an insignificant amount of disk space. I'd suggest
> giving
> KDE/Plasma desktop metapackages a Recommends on xdg-desktop-portal-
> kde
> to make sure most KDE users have that one available.
> 
> > Would this then allow the user to
> > install flatpak with xdg-desktop-portal-kde and without installing
> > -gtk
> > ?
> 
> That's already possible - it's only a Recommends. However, having
> -kde provide the virtual package would make that configuration easier
> to achieve.
> 
>     smcv