26d375467b
An alternate to D14839, implemented in Python and relying on bpy.data.user_map(). That function gives us a mapping of what ID is referenced by what set of IDs. The inverse of this would also be useful, which is now available from bpy_extras.id_map_utils.get_id_reference_map(). From there, we can use get_all_referenced_ids() to get a set of all IDs referenced by a given ID either directly or indirectly. To get only the direct references, we can simply pass the ID of interest as a key to the dictionary returned from get_id_reference_map(). Reviewed By: mont29 Differential Revision: https://developer.blender.org/D14843