KArrowSwitch adds support for arrow keys in KDE default (Breeze) alt+tab/grave-accent task switcher. it is very simply implemented, it detects alt+tab/grave-accent (hence an active task-switcher state) then it emulates "tab/grave-accent" key when right/down arrows are pressed, and "shift+tab/grave-accent" for left/up arrows.

KArrowSwitch is a small desktop-agnostic application that runs in the background as a daemon. It borrows its core engine from ksuperkey by Hans Chen: https://github.com/hanschen/ksuperkey

There is a binary (compiled on Kubuntu 18.04) in the releases section. Below are some generic instructions for how to compile KArrowSwitch from source.

1. Install dependencies.

   Ubuntu:

   $ sudo apt-get install gcc cmake build-essential libx11-dev libxtst-dev
   

   CentOS:

   $ sudo yum install gcc cmake build-essential libX11-devel libXtst-devel
   

2. Clone project and compile:

   $ git clone https://github.com/nimatrueway/karrowswitch.git
   $ cd karrowswitch
   $ cmake .
   $ make
   

$ karrowswitch [-d] [--no-left-right]

-d

Debug mode. Does not fork into the background and logs keyboard events and task-switcher detections and key emulations.

--no-left-right

Disables detection of left/right arrow keys, so only up/down arrows will be effective.

The author can be reached at nima.trueway at gmail dot com