663
663
;; if there was a parent already, update it consistently.
664
664
(if (not (vm-th-safe-parent-p id-sym parent-sym))
667
668
(if (member (symbol-name id-sym) vm-traced-message-ids)
668
669
(vm-thread-debug 'vm-build-reference-threads-1 id-sym))
669
670
(cond ((null (vm-th-parent-of id-sym))