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726296f022
Adds basic support for the "wheel" event from the Wayland tablet protocol. Ideally we would accumulate the angle and report a wheel event with an appropriate value for "clicks". We can get away with a much cruder method for the time being, however, since no Wacom tablet puck actually provides a smooth scrollwheel. Checking whether the angle in CLUTTER_INPUT_AXIS_WHEEL exceeds a nominally-small threshold is sufficient to determine that the wheel has advanced by at least one physical click. https://bugzilla.gnome.org/show_bug.cgi?id=783716