bug#81560: 31.0.91; dframe-update-speed specifies :type integer

> From: Daniel Mendler <[email protected]>
> Cc: [email protected]
> Date: Wed, 05 Aug 2026 19:26:13 +0200
> 
> Eli Zaretskii <[email protected]> writes:
> 
> >> Date: Wed, 05 Aug 2026 17:42:10 +0200
> >> From: Daniel Mendler via "Bug reports for GNU Emacs,
> >>  the Swiss army knife of text editors" <[email protected]>
> >> 
> >> The speedbar uses the customizable variable `dframe-update-speed' to
> >> check for updates. This variable has variable :type `integer' but
> >> shorter delays are supported, e.g., 0.5. I suggest to change the
> >> variable :type to `number'.
> >
> > Actually, 'number' is also inaccurate: the value can be in the format
> > of the value returned by current-idle-time, because the value is
> > passed to run-with-idle-timer.
> 
> So is there a type which you think is appropriate?

If we change no other code, then perhaps allowing a list of
appropriate lengths in addition to a number?  IOW, a custom validation
function.

> What do we use for other delays?

I didn't yet have time to look, sorry.