Previously, the 'Namespace' and 'Tag filter' options occupied a place between two horizontal lines:
With collapsed Legend:
Now, in betalabs, when 'Namespace' and 'Tag filter' options became filters, the space between two horizontal lines is empty:
With collapsed Legend:
Also, the following mockup does not have any extra empty space preserved:
http://pauginer.github.io/prototypes/edit-review/extended-filters/index.html