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: Thu, 18 Nov 2021 18:27:44 +0800
> 
> Po Lu <luangruo@yahoo.com> writes:
> 
> > That makes sense, I'll modify the change in a bit to report scroll
> > deltas as a pair of (DELTA-X . DELTA-Y) instead.
> 
> Here it is, and thanks in advance.

Thanks, LGTM.  But I wonder whether we should have some more prominent
explanations in commands.texi about the significance of these wheel
events, and also some index entry to allow to find this quickly.