bug#5557: <left-margin> <double-wheel-down> is undefined

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Tue, 1 Oct 2019 20:43:36 +0200
> Cc: Lars Ingebrigtsen <larsi@gnus.org>, 5557@debbugs.gnu.org, 
>       Lennart Borgman <lennart.borgman@gmail.com>
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > That's because in your build these gestures on the scroll bar are
> > processed by GTK, not by Emacs.  Try some other toolkit, or maybe
> > no-toolkit, and you will see what I see.
> 
> Is that expected behaviour on GTK?  It seems weird to get graphical
> feedback when nothing is happening in Emacs.

I don't know.  Maybe Martin does.