(comint-dynamic-complete): Expand PATHDIR in call to file-name-completion.

lisp/comint.el

@@ -1184,8 +1184,15 @@ it just adds completion characters to the end of the filename."
   (let* ((pathname (comint-match-partial-pathname))
 	 (pathdir (file-name-directory pathname))
 	 (pathnondir (file-name-nondirectory pathname))
-	 (completion (file-name-completion  pathnondir
-					   (or pathdir default-directory))))
+	 (completion (file-name-completion
+		      pathnondir
+		      ;; It is important to expand PATHDIR because
+		      ;; default-directory might be a handled name, and the
+		      ;; unexpanded PATHDIR won't necessarily match the
+		      ;; handler regexp.
+		      (if pathdir
+			  (expand-file-name pathdir)
+			default-directory))))
     (cond ((null completion)
 	   (message "No completions of %s" pathname)
 	   (ding))