[mv] Refresh of cart re-orders item

["Warren Odom" <warren-odom@stenocall.com>]

******    message to minivend-users from "Warren Odom" <warren-odom@stenocall.com>     ******

I can't find anything about this in the archives.  I've noticed the problem
in both the MV-simple and Interchange-barry demos (and on the "home" web
site as well as my own installation).

When you order an item, of course it displays the cart page.  If you then
hit the browser Refresh button (say, because of some display
corruption-which is how I found this in the first place), you get a
duplicate order of that same item.  (It doesn't add one to the quantity;
rather, it creates a separate line.)  Not what you want to see happen.

           -- Warren

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