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Eli Zaretskii authored
src/xdisp.c (next_element_from_c_string): Use Lisp integer zero as the object. (set_cursor_from_row, try_cursor_movement, dump_glyph) (insert_left_trunc_glyphs, append_space_for_newline) (extend_face_to_end_of_line, highlight_trailing_whitespace) (find_row_edges, ROW_GLYPH_NEWLINE_P, Fmove_point_visually) (Fbidi_resolved_levels, produce_special_glyphs) (rows_from_pos_range, mouse_face_from_buffer_pos) (note_mouse_highlight): Use nil as the object for glyphs inserted by the display engine, and test with NILP instead of INTEGERP. src/w32fns.c (Fx_show_tip): Use NILP to test for glyphs inserted by the display engine. src/xfns.c (Fx_show_tip): Use NILP to test for glyphs inserted by the display engine. src/dispextern.h (struct glyph, struct it): Update comments for the OBJECT members.
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