bug#52685: 29.0.50; Horizontal scrolling doesn't work when compiled with pgtk

[Po Lu]

Andrey Listopadov <andreyorst@gmail.com> writes:

> after a recent update, horizontal scrolling is now reversed both when
> pixel scrolling is enabled and disabled.  I've recompiled without the
> `--with-pgtk' switch and horizontal scrolling is not reversed anymore.
> Seems that some value needs to be negated on the pgtk side

Could you explain what "reversed" means in this context?  Which events
are sent when you scroll with your fingers moving leftwards?  And
rightwards?

Perhaps you just need to set mouse-wheel-tilt-scroll to t.