kwin_wayland window decoration

[David Edmundson]

Kwin will decorate the window if and only if the client tells it to.

With Qt < 5.12 this was injected by plasma-integration plugin which
relies on those XDG_CURRENT_DESKTOP
For Qt >= 5.12 (with latest plasma) it will work out the box without
plasma-integration
For GTK apps you will need the latest GTK release.

>It would get the default wayland window deco
What do you mean by default wayland deco?