end
      -- eradicate side B from any locations we track
      if State.cursor1.posB then
        State.cursor1.posB = nil
        State.cursor1.pos = utf8.len(State.lines[State.cursor1.line].data)
        State.cursor1.pos = Text.pos_at_start_of_screen_line(State, State.cursor1)

      if State.screen_top1.posB then
        State.screen_top1.posB = nil
        State.screen_top1.pos = utf8.len(State.lines[State.screen_top1.line].data)
        State.screen_top1.pos = Text.pos_at_start_of_screen_line(State, State.screen_top1)
      end