Adriaan de Groot said:
> Personally I'd go with a KPassivePopup saying
> "Desktop n", screen-centered,  for a second or two. But I'm sure y'all
> have thought of that already.

Of course, this already happens if "Popup desktop name on desktop switch"
is checked on "Window Behavior -> Focus" panel of the Control Center. 
This was set by default for me.

-- 
Jason Voegele
"There is an essential core at the center of each man and woman that
remains unaltered no matter how life's externals may be transformed
or recombined. But it's smaller than we think."
    -- Gene Wolfe, The Book of the Long Sun