:hide-if-empty - hide if no buttons would be shown
(only makes sense without :show-empty-searches)
:filter - This can be a function that takes the search query as its argument and
- returns a filter to be used in conjuction with the query for that search or nil
+ returns a filter to be used in conjunction with the query for that search or nil
to hide the element. This can also be a string that is used as a combined with
each query using \"and\".
:filter-count - Separate filter to generate the count displayed each search. Accepts