+ (while (or
+ ;; See whether the file exists...
+ (file-exists-p
+ (setq file (concat (nnmail-group-pathname group nnmh-directory)
+ (int-to-string (cdr active)))))
+ ;; ... or there is a buffer that will make that file exist
+ ;; in the future.
+ (get-file-buffer file))
+ ;; Skip past that file.