Scenario: move down to second screen line of a wrapping line. Cause: I made a mistake in fixing a conflict in the most recent merge.
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local screen_line_index, screen_line_starting_pos = Text.pos_at_start_of_screen_line(State, State.cursor1)
local screen_line_starting_pos, screen_line_index = Text.pos_at_start_of_screen_line(State, State.cursor1)