emacs-28 4f27588a16: Clarify "idleness" in the ELisp manual

[Eli Zaretskii]

branch: emacs-28
commit 4f27588a16a8ce65db1aa5adfeca12bcbf44af3d
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Clarify "idleness" in the ELisp manual
    
    * doc/lispref/os.texi (Idle Timers): Clarify that waiting for
    input with timeout doesn't make Emacs idle.  Suggested by Ignacio
    <ignaciocasso@hotmail.com>.  (Bug#54371)
---
 doc/lispref/os.texi | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/lispref/os.texi b/doc/lispref/os.texi
index b1c19e384b..96cfff3f89 100644
--- a/doc/lispref/os.texi
+++ b/doc/lispref/os.texi
@@ -2284,7 +2284,8 @@ can use in calling @code{cancel-timer} (@pxref{Timers}).
 @end deffn
 
 @cindex idleness
-  Emacs becomes @dfn{idle} when it starts waiting for user input, and
+  Emacs becomes @dfn{idle} when it starts waiting for user input
+(unless it waits for input with a timeout, @pxref{Reading One Event}), and
 it remains idle until the user provides some input.  If a timer is set
 for five seconds of idleness, it runs approximately five seconds after
 Emacs first becomes idle.  Even if @var{repeat} is non-@code{nil},