woothemes/woocommerce — pull request #5361 by mihaigrigori (2014-04-23 12:04:20+00:00)
Title: Two filters for term ids in sales by category reports

This will be used by third parties in order to include additional products that are included under the selected categories but not directly.
e.g. in WooCommerce Multilingual this will be used to include the categories in all languages when building the report hence including products purchased in any language.