
Currently, gnome-shell uses the wrong scrolling direction for horizontal scrolling events. When dx < 0 for a smooth scroll event, then the scrolling direction is supposed to be Clutter.ScrollDirection.LEFT, instead of Clutter.ScrollDirection.RIGHT, as dx is smaller than 0. Fix this issue by swapping the values LEFT and RIGHT. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1665>