advanced search constraints should show in page title

[ebenenglish]

When I am on the advanced search page
And I enter terms into the advanced search fields and click 'Search'
I should see the advanced field search constraints in the page title in the browser window

Blacklight::CatalogHelperBehavior#render_search_to_page_title (from projectblacklight/blacklight@47eab51) adds functionality to display search constraints in the page title on catalog#index views. However, advanced search constraints are not displayed, since there is no provision in that method to display them.

Methods could perhaps be added to BlacklightAdvancedSearch::RenderConstraintsOverride to add functionality to include advanced search constraints in the page title?