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

[Eli Zaretskii]

> Date: Sun, 20 Aug 2023 00:27:13 +0900
> From: Kazuhiro Ito <kzhr@d1.dion.ne.jp>
> Cc: 65070@debbugs.gnu.org,
>       hiroya.ebine1@gmail.com,
>       max@mal-richtig.de
> 
> > Is scrolling with the touchpad
> > more smooth if you set mwheel-coalesce-scroll-events to the nil value?
> 
> No, as far as I tested.
> When mwheel-coalesce-scroll-events is nil, it is very hard to
> scrolling few lines, beacause slowly slinding fingers doesn't make
> valid wheel event of which line count is non-zero.  It seems that
> Emacs shows more similar behavior with other Windows applications when
> mwheel-coalesce-scroll-events is non-nil on especially small amount
> scrolling.

Po Lu, is this expected?  Or, put it another way: how would a user set
up Emacs for smooth scrolling when the touchpad can produce scrolling
amounts smaller than "one scroll unit"?