top2 = Text.previous_screen_line(top2)

      top2 = Text.previous_screen_line(top2, Margin_left, App.screen.width-Margin_right)

    top2 = Text.previous_screen_line(top2)

    top2 = Text.previous_screen_line(top2, left, right)

    top2 = Text.previous_screen_line(top2)

    top2 = Text.previous_screen_line(top2, left, right)

    top2 = Text.previous_screen_line(top2)

    top2 = Text.previous_screen_line(top2, left, right)

function Text.previous_screen_line(pos2)

function Text.previous_screen_line(pos2, left, right)