(Fadd_text_properties, Fremove_text_properties):
Add len>0 as condition for main loop. Abort if reach a null interval. (Fset_text_properties): Abort if reach a null interval. (Ftext_properties_at, Fget_text_property): Return nil if POS is end of OBJECT. (add_properties): Use NILP to test result of Fequal. No longer inline. (remove_properties): No longer inline. (set_properties): Total rewrite as function. (validate_interval_range): Don't alter *begin at end of buffer. But do search for a position just before the end. Return null for an empty string. (validate_interval_range): Allow 0 as position in string. Add 1 to specified string positions. (Fprevious_single_property_change): Subtract 1 if object is string. (Fnext_single_property_change): Likewise. (Fprevious_property_change, Fnext_property_change): Likewise. (remove_properties): Call modify_buffer. (add_properties): Likewise. (Fadd_text_properties): Pass new arg to add_properties. (Fremove_text_properties): Likewise. (add_properties, remove_properties): New arg OBJECT. Record undo info. (Fput_text_property): New function.
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