[Bug 213957] Subsequent left/right mouse scroll singals are lost unless the mouse is moved

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213957

            Bug ID: 213957
           Summary: Subsequent left/right mouse scroll singals are lost
                    unless the mouse is moved
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: usb
          Assignee: freebsd-usb at FreeBSD.org
          Reporter: yuri at rawbw.com

Microsoft explorer mouse
https://www.amazon.com/Microsoft-Explorer-Touch-Mouse-Black/dp/B00519UZM8 sends
left/right scroll signals. These signals were mapped to button numbers 8/9
before r305828, and to 10/11 after that revision.

Subsequent left/right signals are lost unless the mouse is moved. I can see
that interrupts arrive with hw.usb.ums.debug=16 debug log, but xev only shows a
new ButtonPress event when the mouse is moved. This has been this way forever.

So I think the bug is in ums.c

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