[Bug 276708] hms(4): slightly wrong 1 finger <-> 2 finger handling

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276708

            Bug ID: 276708
           Summary: hms(4): slightly wrong 1 finger <-> 2 finger handling
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: trasz@FreeBSD.org

The hms(4) driver works great for both one-finger cursor movement and
two-finger scrolling, but there's a slight, yet annoying difference compared to
Macbooks regarding what happens when the number of fingers changes.

On my FreeBSD laptop, when I scroll with two fingers and then lift one up, the
scrolling stops, but the cursor doesn't start moving.  I need to lift my other
finger up and then touch the touchpad again.

Correspondingly, when I'm moving the cursor with a single finger and then put
the other finger down, the cursor stops moving, but scrolling never stops.  I
need to take both fingers off the touchpad first.

It's a small difference, but can be quite annoying when you switch between
laptops - and also somewhat hard to nail down.

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