Fix (unreported) private/embedded IDs being added to `bpy.data.user_map()` dict.

We do not want those here.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/python/intern/bpy_rna_id_collection.c b/source/blender/python/intern/bpy_rna_id_collection.c
index a711d223cdf..e1d5c358ba5 100644
--- a/source/blender/python/intern/bpy_rna_id_collection.c
+++ b/source/blender/python/intern/bpy_rna_id_collection.c
@@ -98,6 +98,12 @@ static int foreach_libblock_id_user_map_callback(LibraryIDLinkCallbackData *cb_d
       return IDWALK_RET_NOP;
     }
 
+    if (cb_flag & IDWALK_CB_PRIVATE) {
+      /* We skip private pointers themselves, like root node trees, we'll 'link' their own ID
+       * pointers to their 'ID owner' instead. */
+      return IDWALK_RET_NOP;
+    }
+
     PyObject *key = pyrna_id_CreatePyObject(*id_p);
 
     PyObject *set;