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Plasma/Wayland: Middle-mouse cut-n-paste


today I upgraded my KDE desktop-environment (DE) to Plasma v5.20.x and
Framework v5.77.x from Debian/unstable - together with some Base-Apps
to v20.12.x if available.

As a terminal app I use konsole, but in Plasma/Wayland I cannot use
middle-mouse for cut-n-paste (primary selection).

What works:

terminal$ konsole -platform xcb

terminal$ QT_QPA_PLATFORM="xcb;wayland" konsole

Fabian Vogt commented on the autodetection via QT_QPA_PLATFORM
environment variable.
Not sure what the default behaviour and settings is in Debian/KDE/QT is.

Here on Debian/testing AMD64 it looks like the environment variable
QT_QPA_PLATFORM is not set:

user$ declare -x | grep QT
declare -x PLASMA_USE_QT_SCALING="1"
declare -x QT_WAYLAND_FORCE_DPI="96"

Checking my DE from shell:

user$ declare -x | grep XDG_SESSION
declare -x XDG_SESSION_CLASS="user"
declare -x XDG_SESSION_ID="26"
declare -x XDG_SESSION_PATH="/org/freedesktop/DisplayManager/Session9"
declare -x XDG_SESSION_TYPE="wayland"

Can I change the behaviour of konsole via its settings (in its menu I
did not found something useful)?
Can I do the change KDE/App specific (see ArchLinux Wiki).?
Systemwide via KDE system-settings?
Any other and useful ways?


- Sedat -

[1] https://lists.opensuse.org/opensuse-kde/2018-06/msg00005.html
[2] https://wiki.archlinux.org/index.php/KDE#Kmail,_Kontact_and_wayland

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