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Those won't have ABS_MT_* axes, so won't be reported has having XITouchClassInfo. Fallback on these to checking whether abs x/y axes are available. After the Wacom checks, any remaining device with absolute axes should be touchscreens, and GDK_SOURCE_MOUSE does indeed just make sense on devices with relative axes. https://bugzilla.gnome.org/show_bug.cgi?id=757358
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