bug#51891: 29.0.50; [PATCH] Pixel delta support for wheel events on X

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: rpluim@gmail.com,  51891@debbugs.gnu.org
> Date: Sat, 20 Nov 2021 08:30:07 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Some text which makes it clear how these additional POSITION
> > parameters could be used by Lisp programs.
> > I think "pixel-resolution wheel events".
> 
> WDYT about the following passage?
> 
>   @cindex pixel-resolution wheel events
>   You can use @var{x} and @var{y} to determine how much the mouse wheel
>   has actually moved.

Here I would say "... has actually moved at pixel resolution."

>                       Scrolling the screen by these pixel deltas allows
>   to present movement that appears to follow the user's grip on the
>   mouse wheel.

That's just an example of using this feature, so:

  For example, the pixelwise deltas could be used to scroll the
  display at pixel resolution, exactly according to the user's turning
  the mouse wheel.

Thanks.