bug#38187: 27.0.50; No mouse-wheel scaling on images

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: Stefan Kangas <stefan@marxist.se>,  Eli Zaretskii <eliz@gnu.org>,
>   38187@debbugs.gnu.org
> Date: Mon, 18 Nov 2019 23:37:15 +0200
> 
> -(defun image-increase-size (n)
> +(defun image-increase-size (&optional n event)

Can we avoid mixing numerical argument with a mouse event?  It looks
unclean to me.  How about a simple wrapper that accepts a mouse event
and calls image-increase/decrease-size with a suitable arg?

Thanks.