Re: [tumbleweed] kde/plasma/wayland: Primary Selection Protocol (middle-mouse to paste)

Hi,

Am Freitag, 21. Juni 2019, 15:59:40 CEST schrieb Sedat Dilek:
> On Wed, Jun 13, 2018 at 5:40 PM Fabian Vogt <[email protected]> wrote:
> >
> > Hi,
> >
> > (sorry, the previous mail got sent because the newline and send keys are
> > too similiar...)
> >
> > Am Mittwoch, 13. Juni 2018, 17:26:15 CEST schrieb Sedat Dilek:
> > > Hi,
> > >
> > > after I tried KDE/Plasma/Wayland on Debian/testing AMD64 I inspired my
> > > colleague Joop Boonen to test it on OpenSuse/tumbleweed.
> > >
> > > Everything was fine besides Primary Selection (middle-mouse to paste),
> > > so I stopped using Plasma/Wayland.
> >
> > That's easy to explain: There is no offical protocol for the primary selection
> > yet. GNOME uses some internal one meanwhile.
> >
> > > Joop is able to use primary selection in every application (KDE or GTK).
> > > So, I was surprised.
> > > Here on KDE/Plasma 5.12.5 I cannot do that (for example cut-n-paste in
> > > konsole via middle-mouse paste into firefox).
> >
> > Plasma 5.13 introduced a change in the way environment variables are set.
> > QT_QPA_PLATFORM is not forced to "wayland" anymore, but it's up to the
> > application to decide whether to use "xcb" or "wayland". Before Qt 5.11 the
> > default was "xcb", now it's autodetected.
> >
> > We have backports of those changes in Plasma 5.12 (specifically for Leap 15)
> > and I also added "GDK_BACKEND=x11" in the startup file so that both GTK and Qt
> > applications behave similiar (also required to get drag-and-drop working
> > reasonably).
> >
> > Before Qt 5.11 (so TW until last week and Leap 15), Qt applications use the XCB
> > platform there and go through Xwayland. So they use the X primary selection.
> >
> > In TW we're at Qt 5.11 now, which means applications autodetect the wayland
> > platform now and as a result the primary selection is actually broken again...
> >
> > You can workaround that by passing "-platform xcb" to applications you want to
> > use the primary selection in, like "konsole -platform xcb".
> > GDK_BACKEND=x11 is still active as GTK3 has a broken implementation of the
> > window decoration handling and is practically unusuable.
> >
> > I'm thinking about making a proposal to flip the default in Qt again for now,
> > to restore the pre 5.11 behaviour. There aren't really any downsides there,
> > except that the "wayland" Qt backend gets less testing.
> >
> 
> Hi Fabian,
> 
> I just wanted to let you know, there was some progress on this:
> 
> In upstream qtwayland.git#dev (see [1] and [2]):
> "Client: Implement primary-selection-unstable-v1 "
> 
> And wayland-prtocols v1.17 includes (see [3] and [4]):
> "unstable: add primary-selection protocol"
> 
> Joop just showed me "middle-mouse-paste" works on his latest
> kde/plasma/wayland environment in GTK- and KDE/QT-based apps.
> 
> How did you realize this?
> Do you have the above qtwayland patch(es)?

No, not much changed since last time.
Even in a Plasma Wayland session, Qt and GTK still default to X11.

Client-side support for the protocol will be in Qt 5.14, but the compositor
part in KWin/KWayland is still missing. So currently it's not really useful.
Once the missing parts are in place, we can try to backport them, of course.

Cheers,
Fabian

> Thanks.
> 
> Regards,
> - Sedat -
> 
> 
> [1] https://bugreports.qt.io/browse/QTBUG-66008
> [2] https://github.com/qt/qtwayland/commit/5ec182df699041699f514d164a161c299fde5d19
> [3] https://lists.freedesktop.org/archives/wayland-devel/2018-November/039662.html
> [4] https://github.com/wayland-project/wayland-protocols/commit/2c3b11d76fd498fc3856cdd36ac76c1193686bf1
> 
> 
> > Cheers,
> > Fabian
> >
> > > I asked on the wayland-devel ML [1] with no answer.
> > > The retired KWin maintainer wanted to have this feature in
> > > wayland-protocols before implementing it in KWin/Plasma/Wayland.
> > >
> > > So, what magic did you do in OpenSuse?
> > > The Gnome-way?
> > > [1] has references on how Gnome did it in mutter.
> > > Or can you point me to the relevant packages with name (sources and patches)?
> > >
> > > Thanks in advance.
> > >
> > > Regards,
> > > - Sedat -
> > >
> > > [1] https://lists.freedesktop.org/archives/wayland-devel/2018-April/037748.html


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