run-with-idle-timer Doc string Question

[T.V Raman]

What does this line:
Using
SECS <= N is not recommended if this function is invoked from an idle
timer, because FUNCTION will then be called immediately.

in the doc-string for run-with-idle-timer mean?

run-with-idle-timer is an interactive compiled Lisp function in
‘timer.el’.

(run-with-idle-timer SECS REPEAT FUNCTION &rest ARGS)

  Probably introduced at or before Emacs version 19.31.

Perform an action the next time Emacs is idle for SECS seconds.
The action is to call FUNCTION with arguments ARGS.
SECS may be an integer, a floating point number, or the internal
time format returned by, e.g., ‘current-idle-time’.
If Emacs is currently idle, and has been idle for N seconds (N < SECS),
then it will call FUNCTION in SECS - N seconds from now.  Using
SECS <= N is not recommended if this function is invoked from an idle
timer, because FUNCTION will then be called immediately.

If REPEAT is non-nil, do the action each time Emacs has been idle for
exactly SECS seconds (that is, only once for each time Emacs becomes idle).

This function returns a timer object which you can use in ‘cancel-timer’.

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♉Id: kg:/m/0285kf1  🦮♉

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♉Id: kg:/m/0285kf1  🦮♉