bug#81561: 31.0.91; speedbar-window-mode creates stale idle timers

> From: Daniel Mendler <[email protected]>
> Cc: Eli Zaretskii <[email protected]>,  [email protected]
> Date: Sun, 09 Aug 2026 17:01:57 +0200
> 
> Ciao Vincenzo!
> 
> Vincenzo Pupillo <[email protected]> writes:
> > Ciao, sorry for the delay—I'm on vacation. The attached patch should fix the 
> > bug. It's partly due to an incorrect condition in 'dframe-set-timer' that 
> > doesn't follow what's written in the comment. This fix also resolves an issue 
> > with 'speedbar-frame-mode,' which wasn't clearing the timer even when 
> > 'speedbar-buffer' was killed.
> >
> > @Daniel, can you please check to see if the patch fixes the problem?
> 
> Yes, thank you! The patch fixes the problem. The stale timers are gone
> when the speedbar is closed.
> 
> Eli, can you please apply this to emacs-31, since it fixes an issue,
> which has been newly introduced via the new speedbar-window-mode?

Thanks, done, and closing the bug.