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
BTN_STYLUS3 is defined by the Linux 4.15 kernel and is sent when the third button on a stylus is pressed. At the moment, only Wacom's "Pro Pen 3D" has three stylus buttons. Pressing this button triggers a button 8 event to be sent under X11, so we use the same mapping here. https://bugzilla.gnome.org/show_bug.cgi?id=790033