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

[Kazuhiro Ito]

> > >> > 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"?
> > 
> > By enabling pixel-scroll-precision-mode, thanks.
> 
> Kazuhiro Ito and Max, could you perhaps try that and provide feedback?
> I wrote that code flying blind, having no access to a system where the
> scrolling gestures could provide such fine resolution.  So I would be
> interested to know the results.

Enabling pixel-scroll-precision-mode provides more smoother,
pixel-based scrolling on Windows!

FYI, mwheel-coalesce-scroll-events is automatically set to nil by
pixel-scroll-precision-mode.

-- 
Kazuhiro Ito