Source

vm / vm-sort.el

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File vm-sort.el

       (setq key (car key-list))
       (cond ((equal key "thread")
 	     (vm-build-threads-if-unbuilt)
+	     (vm-build-thread-lists)
 	     (setq key-funcs (cons 'vm-sort-compare-thread key-funcs)))
 	    ((equal key "author")
 	     (setq key-funcs (cons 'vm-sort-compare-author key-funcs)))