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Dion Moult
ecde429d36
After assigning an IFC class and undoing, msgbus subscriptions registered with the old Python object wrapper survived (PERSISTENT flag) but could not be cleared because: (1) rollback_link_element looked up objects by their post-link name which no longer exists after undo, and (2) the per-object clear_by_owner calls in rebuild_element_maps used new Python wrappers that didn't match the old subscription owners. Fix by using a dedicated stable object (object_subscription_owner) as the msgbus owner for all per-object subscriptions, allowing rebuild_element_maps to clear all stale subscriptions in one call regardless of Python wrapper identity changes during undo/redo. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>