(find-alternate-file): Hide truename and inode number

temporarily, like the visited file name.

lisp/files.el

@@ -421,15 +421,21 @@ If the current buffer now contains an empty file that you just visited
        (error "Aborted"))
   (let ((obuf (current-buffer))
 	(ofile buffer-file-name)
+	(onum buffer-file-number)
+	(otrue buffer-file-truename)
 	(oname (buffer-name)))
     (rename-buffer " **lose**")
     (setq buffer-file-name nil)
+    (setq buffer-file-number nil)
+    (setq buffer-file-truename nil)
     (unwind-protect
 	(progn
 	  (unlock-buffer)
 	  (find-file filename))
       (cond ((eq obuf (current-buffer))
 	     (setq buffer-file-name ofile)
+	     (setq buffer-file-number onum)
+	     (setq buffer-file-truename otrue)
 	     (lock-buffer)
 	     (rename-buffer oname))))
     (or (eq (current-buffer) obuf)