title: How to prevent `out of stock` items to show as a filter option in the sidebar (layered nav widget ) in WooCommerce?
body: <p>I have 'hide out of stock' checked in the settings, however when using the layered navigation widget to filter results by shoe size, it is returning products which have that size listed as an attribute, but the size is out of stock. Is there a fix to this?</p>
  
  <p>WordPress version 3.9.1, WooCommerce version 2.1.7</p>
  
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