KDE disable super_L (windows key) key shortcut as menu launcher

In kde plasma 5.8 the super/win key is also used to trigger the launcher, when pressed and released without combining it with another key. To disable the feature, put

[ModifierOnlyShortcuts]
Meta=

in ~/.config/kwinrc.

https://superuser.com/questions/1156130/kde-disable-super-l-windows-key-key-shortcut-as-menu-luncher