From https://bugzilla.gnome.org/show_bug.cgi?id=764209 left-handed doesn't work for the top software buttons, quick code check suggests the left-handed setting is applied in tp_post_clickpadbutton_buttons, then passed to the normal evdev code in tp_notify_clickpadbutton, then applied again (and thus reversed) in evdev_process_key
commit 1ecf6d7a607c5f481eb9b3b6365d7b55a0f18c53 Author: Peter Hutterer <peter.hutterer@who-t.net> Date: Wed Mar 30 15:31:07 2016 +1000 touchpad: fix left-handed top software trackpoint buttons
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