We're already using '1' and '2' suffixes for (line, pos) vs (line, screen-line, screen-pos) schemas. We'll use the 'B' suffix for text after the fold. 'B' for 'bifold' and also because stuff before the fold is implicitly the 'A' side.
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overflows_screen, x, y, pos, screen_line_starting_pos = Text.draw_wrapping_line2(State, line_index, x+2*App.width(State.em),y, pos)
overflows_screen, x, y, pos, screen_line_starting_pos = Text.draw_wrapping_lineB(State, line_index, x+2*App.width(State.em),y, pos)