[Wayland-bugs] [Bug 765939] [Wayland] very slow scrolling in GtkMenu using the touchpad

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765939

--- Comment #10 from Olivier Fourdan <ofourdan at redhat.com> ---
(In reply to Carlos Garnacho from comment #9)
> [...]
> 
> We have 3 cases to support (provided we only listen to non-emulated events):
> 
> - Mice capable of discrete vertical scrolling, the typical scroll wheel
> - Mice capable of discrete v/h scrolling, usually scroll wheels that can
> "click" towards the sides, or just additional buttons.
> - Devices capable of continuous v/h scrolling, this gathers touchpads,
> trackballs, trackpads and mice, which all have at least one way available to
> smooth scroll (because the device itself allows it, or because there's an
> assigned scroll button)
> 
> Out of those cases, only in the first one there's an axis we can't scroll
> across, so it used to make sense to allow scrolling horizontally with
> vertical events if the widget needed this so. But IMO that's about the only
> situation where it makes sense to mix scrolling axes (and I'd wish we could
> discern devices from the first and second case so we don't needlessly do
> this), for the other cases we have real means to scroll in that direction.

Yes, but we had support for left/right so I thought we would want to retain
that functionality.

> So, I'd even argue to remove GDK_SCROLL_LEFT/RIGHT management from GtkMenu
> :).

What about making this a separate patch, so that if someone complain, we can
always revert that one alone?

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