(cursor_row_p): New function.
(try_cursor_movement, display_line): Use it. (append_space): Also save/restore iterator's current character and its length. (init_from_display_pos): Add an assertion. (handle_stop): Don't set iterator's add_overlay_start. (handle_invisible_prop): Likewise. (load_overlay_strings): If text under an overlay is invisible, take both before- and after-strings into account when the iterator is positioned either at the start or at the end of the overlay. (forward_to_next_line_start): Rewritten. (reseat_at_next_visible_line_start): Rewritten. (set_iterator_to_next): Add parameter RESEAT_P.
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