section k of routines in graph.i

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keybd_focus |
                 keybd_focus, on_off

         By default, graphics windows set a window manager hint which
         allows them to accept keyboard focus.  With ON_OFF zero, that
         hint will not be set when a new graphics window is created.
         This causes the window manager to refuse to offer keyboard
         focus to the graphics window -- very desirable, since it can't
         accept keyboard input anyway.  With fvwm, for example, this
         means keyboard focus can stay in the terminal window even when
         you are mouse zooming the graphics window.  However, many
         window managers confuse colormap focus with keyboard focus, so
         if you set the private=1 colormap in the window function, you
         may not be able to convince the window manager to give the
         graphics window colormap focus since it won't give it keyboard
         focus.  Weird.

    builtin function, documented at i0/graph.i   line 1393