Re: How to reset the idle timer?

> True, although I'd be /extremely/ curious to learn about a use-case
> depending on the current behavior so much that this change could
> break it!

My intuition tends to agree, but it's hard to be sure.
The current behavior is very explicitly documented in the docstring of
`run-with-idle-timer` since

    commit 171d328e8dd84e6d9e8d168e4e91fe989b65b138
    Author: Richard M. Stallman <[email protected]>
    Date:   Sun Aug 20 12:16:26 2006 +0000

    (run-with-idle-timer): Pass t to timer-activate-when-idle, so timer
    can run before Emacs becomes non-idle again.

Bugs #12447 and #12326 suggest this behavior is a source of bugs, but of
course that doesn't tell us if others are happy about the behavior
introduced 20 years ago.

FWIW, in [futur](https://elpa.gnu.org/packages/futur.html), I just added
a `futur-timeout-idle` which is supposed to implement the behavior
I described.  You could use it as follows:

    (require futur)

    (futur-bind
     (futur-timeout-idle 30)
     (lambda (_)
       (message "30s of idle timeout have elapsed!")))

Beware: the implementation is hackish/ugly/experimental and it's only
been lightly tested.  IOW handle with care.  If it works well,
send me your praises, but if it doesn't, of course it's not my fault.


=== Stefan