bug#61307: 30.0.50; pixel-scroll-precision-mode: window-scroll-functions?

[Po Lu]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Michael Heerdegen <michael_heerdegen@web.de>
>> Cc: 61307@debbugs.gnu.org
>> Date: Thu, 16 Feb 2023 05:57:18 +0100
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > > But I understand that what I see when scrolling with a normal wheel
>> > > mouse is only one case we need to handle.
>> 
>> > Right.  Though on such a system, we should probably call
>> > window-scroll-functions every scroll.
>> 
>> Is receiving <wheel-up> and <wheel-down> events a sufficient hint that
>> the user is scrolling using a "normal" wheel mouse?
>
> I'm not sure, but Po Lu will know.
>
> In any case, AFAIR some mice produce mouse-4 and mouse-5 events
> instead, so relying on the events' symbols might not be the best
> idea.  We are supposed to know whether the device supports pixel
> precision, so maybe basing the decision on that is better?

Try:

  (device-class last-event-frame last-event-device)

but I will eventually get around to replacing this with some virtual
modifier key in Emacs 30.