if Foo then
    print('draw:', State.lines[line_index].data, "=====", State.lines[line_index].dataB, 'starting from x', x+AB_padding)
  end

--?     print(y, 'top2:', top2.line, top2.screen_line, top2.screen_pos)

    print(y, 'top2:', State.lines[top2.line].data, top2.line, top2.screen_line, top2.screen_pos, top2.screen_lineB, top2.screen_posB)

  Foo = true

    local x = Text.screen_line_width(State, line_index, #line_cache.screen_line_starting_pos) + AB_padding

    local x = Margin_left + Text.screen_line_width(State, line_index, #line_cache.screen_line_starting_pos) + AB_padding

    print('a')

    print('b')

    local l = State.lines[loc2.line-1]

    return {line=loc2.line-1, screen_line=#State.line_cache[loc2.line-1].screen_line_starting_pos, screen_pos=1}

    if State.lines[loc2.line-1].dataB == nil or
        (not State.expanded and not State.lines[loc2.line-1].expanded) then
      print('c1', loc2.line-1, State.lines[loc2.line-1].data, '==', State.lines[loc2.line-1].dataB, State.line_cache[loc2.line-1].fragmentsB)
      return {line=loc2.line-1, screen_line=#State.line_cache[loc2.line-1].screen_line_starting_pos, screen_pos=1}
    end
    -- try to switch to B
    local prev_line_cache = State.line_cache[loc2.line-1]
    local x = Margin_left + Text.screen_line_width(State, loc2.line-1, #prev_line_cache.screen_line_starting_pos) + AB_padding
    Text.populate_screen_line_starting_posB(State, loc2.line-1, x)
    local screen_line_starting_posB = State.line_cache[loc2.line-1].screen_line_starting_posB
    print('c', loc2.line-1, State.lines[loc2.line-1].data, '==', State.lines[loc2.line-1].dataB, '==', #screen_line_starting_posB, 'starting from x', x)
    if #screen_line_starting_posB > 1 then
      print('c2')
      return {line=loc2.line-1, screen_lineB=#State.line_cache[loc2.line-1].screen_line_starting_posB, screen_posB=1}
    else
      print('c3')
      -- if there's only one screen line, assume it overlaps with A, so remain in A
      return {line=loc2.line-1, screen_line=#State.line_cache[loc2.line-1].screen_line_starting_pos, screen_pos=1}
    end

  if loc2.screen_lineB > 1 then
    return {line=loc2.line, screen_lineB=loc2.screen_line-1, screen_posB=1}

  if loc2.screen_lineB > 2 then  -- first screen line of B side overlaps with A side
    return {line=loc2.line, screen_lineB=loc2.screen_lineB-1, screen_posB=1}

    -- TODO: handle case where fold lands precisely at end of a new screen-line

  Foo = true

  if Foo then
    print(State.screen_top1.line, State.screen_top1.pos, State.screen_top1.posB, '--', State.cursor1.line, State.cursor1.pos, State.cursor1.posB, '--', State.screen_bottom1.line, State.screen_bottom1.pos, State.screen_bottom1.posB)
  end

  Foo = nil