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

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.
>
> 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
> >
>

Hi Fabian,

is there an elegant way to "force" an KDE application to use the xcb
platform in Plasma/Wayland?

Alternatives via terminal:

terminal$ konsole -platform xcb

terminal$ QT_QPA_PLATFORM="xcb;wayland" konsole

When I start konsole with wayland platform - I cannot cut-n-paste into
e.g. firefox.

Thanks.

Regards,
- Sedat -

[1] https://lists.debian.org/debian-kde/2020/12/msg00056.html
[2] https://www.heise.de/forum/heise-online/Kommentare/KDE-Plasma-5-20-Neue-Version-verbessert-Uebersichtlichkeit-der-Desktopumgebung/KDE-Wayland-Add-support-for-Primary-Selection-Protocol-middle-mouse-to-paste/posting-37601192/show/
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