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(Fadd_text_properties, copy_text_properties): Likewise.

rid of all properties of a string.

Fnext_single_property_change, Fprevious_property_change,
Fprevious_single_property_change, copy_text_properties): Don't use XFASTINT as
an lvalue.

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.

Fnext_property_change, Fnext_single_property_change,
Fprevious_property_change, Fprevious_single_property_change,
Ftext_property_any, Ftext_property_not_all): Use type test macros.

(Fset_text_properties): Don't let validate_interval_range
increment START and END twice.

(NULL): Define if not defined.

Fnext_property_change, Fnext_single_property_change,
Fprevious_property_change, Fprevious_single_property_change): Fix Lisp_Object
vs. int problems.

Return early if buffer has no intervals and PROPS is nil.

for edge effects.

(Fprevious_single_property_change): Likewise.

the case where there are no intervals.
(Fprevious_single_property_change, Fprevious_property_change)
Extra arg LIMIT.  Return value was off by 1.
(Fnext_single_property_change, Fnext_property_change):
Extra arg LIMIT.
(Fnext_single_property_change): Require at least 2 args.

in loop, before looking at next->position.

(syms_of_textprop): Set them up.

(Qhidden): New variable.
(syms_of_textprop): Set up Qhidden.

(property_change_between_p): New function.

(Qinsert_behind_hooks): Moved to buffer.c.
(syms_of_textprop): Lisp vars setup deleted.

	OFFSET argument of these functions to be origin 0, not origin 1.
	This is what all the callers currently want.
	* intervals.c, textprop.c: All callers changed.

	* textprop.c (Ftext_property_not_all): Renamed from
	Ftext_property_all, and changed sense of return value, so that it
	returns useful information if not all characters have properties
	EQ to value.  Now all the existential and universal questions can
	be asked.

	* textprop.c (syms_of_textprop): Don't forget defsubr for
	Stext_property_all.

	* textprop.c (Ftext_property_any, Ftext_property_all): Use EQ to
	compare property values, not Fequal.

	* textprop.c (Ftext_property_any, Ftext_property_all): New
	functions, from David Gillespie.
	* intervals.h (Ftext_property_any, Ftext_property_all): Declare them.

(syms_of_textprop): Set them up.

(set_properties): Call modify_region.
(remove_properties): Call modify_region before record_property_change.
(add_properties): Likewise.