@redmunds Crud, I think the width depends on whether you have a mouse plugged in.  With no mouse, it's _far_ narrower.  I think there is some fancy measuring logic in CM that tries to detect which case we're in.  We could duplicate that here...

But for the time being (in the interest of getting the Win width fix merged this sprint), I wonder if we should just continue doing what master does -- err on one side or the other.  I don't feel strongly which one; master assumes there is a mouse, this PR assumes trackpad.  Which do you think is better for now?