Python API: Add functions to ensure and clear IDProperties

This adds id_properties_clear() and id_properties_ensure() functions
to RNA structs. This is meant as an initial change based on discussion
in review of D9697. However, they may be useful in other situations.

The change requires refactoring the internal idproperties callback to
return a pointer to the IDProperty pointer, which actually turns out
to be quite a nice cleanup.

An id_properties attribute could be added in the future potentially.

Differential Revision: https://developer.blender.org/D11908

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/makesrna/intern/rna_internal.h b/source/blender/makesrna/intern/rna_internal.h
index bfe9d4bb77c..f15368bcc77 100644
--- a/source/blender/makesrna/intern/rna_internal.h
+++ b/source/blender/makesrna/intern/rna_internal.h
@@ -276,10 +276,10 @@ void rna_ID_name_get(struct PointerRNA *ptr, char *value);
 int rna_ID_name_length(struct PointerRNA *ptr);
 void rna_ID_name_set(struct PointerRNA *ptr, const char *value);
 struct StructRNA *rna_ID_refine(struct PointerRNA *ptr);
-struct IDProperty *rna_ID_idprops(struct PointerRNA *ptr, bool create);
+struct IDProperty **rna_ID_idprops(struct PointerRNA *ptr);
 void rna_ID_fake_user_set(struct PointerRNA *ptr, bool value);
 void **rna_ID_instance(PointerRNA *ptr);
-struct IDProperty *rna_PropertyGroup_idprops(struct PointerRNA *ptr, bool create);
+struct IDProperty **rna_PropertyGroup_idprops(struct PointerRNA *ptr);
 void rna_PropertyGroup_unregister(struct Main *bmain, struct StructRNA *type);
 struct StructRNA *rna_PropertyGroup_register(struct Main *bmain,
                                              struct ReportList *reports,