ksuperkey allows you to open the application launcher in KDE Plasma Desktop using the Super key (also known as the "Windows key"). If you hold down the Super key it will still act as a modifier key, allowing you to use it for other keyboard shortcuts.
ksuperkey is a small application that runs in the background as a daemon. It was forked from xcape by Albin Olsson: https://github.com/alols/xcape
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Install dependencies. On Ubuntu:
$ sudo apt-get install git gcc make libx11-dev libxtst-dev
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Clone project and compile:
$ git clone https://github.com/hanschen/ksuperkey.git $ cd ksuperkey $ make
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Launch ksuperkey. Make sure that the shortcut for the application launcher is set to Alt+F1.
Find the latest version at https://github.com/hanschen/ksuperkey
The author can be reached at contact at hanschen dot org