bug#65070: 29.1; (Only on Windows) Both touchpad scroll gestures scroll the screen up and down.

[Kazuhiro Ito]

> > I noticed that when I input wheel-down with touchpad, line count is
> > set to negative value, which should be positive integer.
> > 
> > (let ((event (read-event)))
> >   (cons (car event) (event-line-count event)))
> > 
> > ;; Input via touchpad
> > (wheel-down . -3)
> > (wheel-up . 3)
> > 
> > ;; Input via mouse wheel
> > (wheel-down . 1)
> > (wheel-up . 1)
> 
> Thanks.  Can you show the complete data of the events in both the
> mouse and the touchpad cases?

;; touchpad
(wheel-down (#<window 62 on *scratch*> 385 (308 . 211) 300986031 nil 385 (38 . 
9) nil (4 . 13) (8 . 22)) 1 -3 (0.0 . -79.75))
(wheel-up (#<window 62 on *scratch*> 158 (225 . 76) 300920437 nil 158 (28 . 3) 
nil (129 . 10) (8 . 22)) 1 3 (0.0 . 76.45))

;; mouse wheel
(wheel-down (#<window 62 on *scratch*> 101 (237 . 26) 300913750 nil 101 (29 . 
1) nil (5 . 4) (8 . 22)))
(wheel-up (#<window 62 on *scratch*> 159 (275 . 101) 300906703 nil 159 (34 . 4) 
nil (275 . 13) (8 . 22)))

-- 
Kazuhiro Ito