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property_change_between_p, Fnext_single_property_change,
Fprevious_property_change, Fprevious_single_property_change,
Fadd_text_properties, Fset_text_properties, Fremove_text_properties,
Ftext_property_any, Ftext_property_not_all, Ferase_text_properties): Use new
accessor macros instead of calling XSET directly.