Feature request from seansan, posted on GitHub Mar 17, 2015
It should ne able to pre-select a layered navigation filter for a category: meaning, that when opening the category page, then a layered navigation filter is already applied
Suppose you sell shoes (configurable product)
and you have a category stating to show all shoes in size 10
you would then create a normal shoe category (select all shoe products)
then selected the (new setting) for a layered navigation pre-select filter for size 10
this way only shoes available in size 10 are shown
http://magento.stackexchange.com/questions/55191/magento-set-selected-filter-in-layered-navigation