Comment #4 on issue 207 by atdi...@gmail.com: Horizontal scrolling causes
Line 761 creates the button value based on the raw event's getModifiers()
(see call to copyButtonsFromModifiers).
For the device you are talking about, does event.getModifiers() or
event.getModifiersEx() give any indication of a special button press? Maybe
there is a natural translation from that to some state we can track...
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