Taxonomy filter to respect query loop settings

[scottpoulin]

The taxonomy filter pulldown will display all terms from that taxonomy, regardless of whether the parent query loop is using taxonomy filtering or not.

It seems to me that if you're limiting the terms in a query loop, the filter pulldown should be limited to those same terms - otherwise you can select a term that's not in the query loop's result set and get "nothing found."

This branch handles this situation, both for filtering via the standard Gutenberg taxonomy filter and Advance Query Loop's implementation. Note that the latter is only partially supported due to limitations in WP's get_terms function - specifically, only IN and NOT IN operators are supported, and multiple term queries must use the OR relation.

[tabbplomaritas]

This is a much needed improvement if this fix works. Hoping Humanmade can review and merge this soon!

[zamartz]

Agree! need this!