+2015-01-08 Eli Zaretskii <eliz@gnu.org>
+
+ * 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.
+ (Bug#19535)
+
+ * w32fns.c (Fx_show_tip): Use NILP to test for glyphs inserted by
+ the display engine.
+
+ * xfns.c (Fx_show_tip): Use NILP to test for glyphs inserted by
+ the display engine.
+
+ * dispextern.h (struct glyph, struct it): Update comments for the
+ OBJECT members.
+