Feature request from brobie, posted on GitHub Apr 01, 2017
From the Magento Hackathon 2017 (https://github.com/magento-hackathon/Imagine2017/issues/23):
As a customer I should be able to create complex filters using the layered navigation so that I can find what I'm looking for quicker.
Note:
example use case a customer sets category = "shoe', sets color to be both 'brown' and 'black'; results should be filtered as if category = shoe and color in ('brown','black).
AC:
Update behavior of selections within a filterset to be the same as an 'or' of those filterset selections
Update behavior when items are selected among multiple filtersets so that filter sets are 'and' ed together