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, 8 deletions

diff --git a/source/blender/makesrna/intern/rna_sequencer.c b/source/blender/makesrna/intern/rna_sequencer.c
index 5f6456d3d1e..b1f0b0d760f 100644
--- a/source/blender/makesrna/intern/rna_sequencer.c
+++ b/source/blender/makesrna/intern/rna_sequencer.c
@@ -734,16 +734,10 @@ static char *rna_Sequence_path(PointerRNA *ptr)
   }
 }
 
-static IDProperty *rna_Sequence_idprops(PointerRNA *ptr, bool create)
+static IDProperty **rna_Sequence_idprops(PointerRNA *ptr)
 {
   Sequence *seq = ptr->data;
-
-  if (create && !seq->prop) {
-    IDPropertyTemplate val = {0};
-    seq->prop = IDP_New(IDP_GROUP, &val, "Sequence ID properties");
-  }
-
-  return seq->prop;
+  return &seq->prop;
 }
 
 static bool rna_MovieSequence_reload_if_needed(ID *scene_id, Sequence *seq, Main *bmain)