Question: On Product Details page I want Next and Previous product to work only withing filtered selection

We need to make one editing to includes applied filters into SQL search query.
In file /administrator/components/com_virtuemart/html/shop_browse_queries.php at line around 200 make two changes.

Download already changed shop_browse_queries.php: Virtuemart 1.1.6 and later    Virtuemart (earlier ver.)

If you have no custom modifications in that file - you may simply overwrite it.

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