custom-type fix for `mh-sortm-args'

How about this fix?  I was originally going to suggest a choice of
`string' or `nil', but then noticed that the documentation suggests a
list of strings.  AFAICT, either a string or a list of strings work.  I
think offering both a string and a list of strings as choices would be
confusing.  I suppose changing the type will cause the custom interface
to whinge about a user's existing string value being of the wrong type
though.

2008-06-02  John Paul Wallington  <jpw <at> pobox.com>

	* mh-e.el (mh-sortm-args): Fix custom type.

--- mh-e.el.~1.124.~	2008-05-31 18:54:46.000000000 +0100
+++ mh-e.el	2008-06-02 21:04:09.000000000 +0100
@@ -1333,7 +1333,8 @@
 specified in the MH profile. This option may be used to provide
 an alternate view. For example, \"'(\"-nolimit\" \"-textfield\"
 \"subject\")\" is a useful setting."
-  :type 'string
+  :type '(choice (const :tag "No arguments" nil)
+                 (repeat :tag "Arguments" (string :tag "Argument")))
   :group 'mh-folder
   :package-version '(MH-E . "8.0"))

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