if State.cursor1.pos then
    Text.leftA(State)
  else
    Text.leftB(State)
  end
end
function Text.leftA(State)

  end
  if Text.lt1(State.cursor1, State.screen_top1) then
    local top2 = Text.to2(State, State.screen_top1)
    top2 = Text.previous_screen_line(State, top2)
    State.screen_top1 = Text.to1(State, top2)
  end
end
function Text.leftB(State)
  if State.cursor1.posB > 1 then
    State.cursor1.posB = State.cursor1.posB-1
  else
    -- overflow back into A side
    State.cursor1.posB = nil
    State.cursor1.pos = utf8.len(State.lines[State.cursor1.line].data) + 1

  if State.cursor1.pos then
    Text.right_without_scrollA(State)
  else
    Text.right_without_scrollB(State)
  end
end
function Text.right_without_scrollA(State)

  elseif State.cursor1.line <= #State.lines-1 then
    State.cursor1 = {line=State.cursor1.line+1, pos=1}
  end
end
function Text.right_without_scrollB(State)
  if State.cursor1.posB <= utf8.len(State.lines[State.cursor1.line].dataB) then
    State.cursor1.posB = State.cursor1.posB+1

    -- overflow back into A side