NeverFocus - bakkeby/dusk GitHub Wiki
NeverFocus is an internal flag used to prevent the window from receiving input focus.
This flag can be set if the extended window manager hints for the window indicates that the window is not to receive input.
xclock is an example program that will get this flag set. The window manager can still select
the client, move or resize it, but the window will never receive input focus (i.e. the window will
not be receiving key or button presses).
Additionally the window will not be advertised as the "active" window in terms of extended window manger hints (the root window's _NET_ACTIVE_WINDOW property).