Fix T41062: "copy to selected" doens't work for all attributes.

The issue was that some properties are no direct children of the struct we support in 'copy to selected'
(RNA_Sequence in this case). Since we can't use the ID of sequences here (it's the scene, while we need
a sequence level of control), we had to add a new API helper to RNA path, which takes a RNA type
and return a path relative to the closest ancester of that type.

This way, we get a path from the RNA_Sequence, and can easily apply it to all other valid sequences
to copy the property.

Review, suggestions and edits by Campbell Barton, thanks!

1 files changed, 13 insertions, 0 deletions

diff --git a/source/blender/makesrna/RNA_access.h b/source/blender/makesrna/RNA_access.h
index a2bbaf67c1a..ba2dd8b5d69 100644
--- a/source/blender/makesrna/RNA_access.h
+++ b/source/blender/makesrna/RNA_access.h
@@ -927,9 +927,22 @@ bool RNA_path_resolve_property(PointerRNA *ptr, const char *path,
 bool RNA_path_resolve_property_full(PointerRNA *ptr, const char *path,
                                     PointerRNA *r_ptr, PropertyRNA **r_prop, int *r_index);
 
+typedef struct PropertyElemRNA PropertyElemRNA;
+struct PropertyElemRNA {
+	PropertyElemRNA *next, *prev;
+	PointerRNA ptr;
+	PropertyRNA *prop;
+	int index;
+};
+bool RNA_path_resolve_elements(PointerRNA *ptr, const char *path, struct ListBase *r_elements);
+
 char *RNA_path_from_ID_to_struct(PointerRNA *ptr);
 char *RNA_path_from_ID_to_property(PointerRNA *ptr, PropertyRNA *prop);
 
+char *RNA_path_resolve_from_type_to_property(
+        struct PointerRNA *ptr, struct PropertyRNA *prop,
+        const struct StructRNA *type);
+
 char *RNA_path_full_ID_py(struct ID *id);
 char *RNA_path_full_struct_py(struct PointerRNA *ptr);
 char *RNA_path_full_property_py(struct PointerRNA *ptr, struct PropertyRNA *prop, int index);