On Mon, Aug 16 2021, Eli Zaretskii wrote:

> The only definition of "idleness" we can use in Emacs is that Emacs is
> not processing any input events.

I agree. So the question is: Does Emacs process a window movement, when
it's not visible? If yes, what does it do? If not, then you seem to
agree to not resetting the idle timer.

-- 
           Peter