XTerm*saveLines: 500
XTerm*Scrollbar.translations: #override\n\
        <BtnDown>:      StartScroll(Continuous) MoveThumb() NotifyThumb() \n\
        <BtnMotion>:    MoveThumb() NotifyThumb() \n\
        <BtnUp>:        NotifyScroll(Proportional) EndScroll()
