On a recent Drupal 8 client project our client was building listing pages using views exposed filters and adding these to the menu.

This resulted in several menu URLs pointing to the same base path, but with the query arguments determining the difference.

However Drupal 8's default menu-trail calculation was resulting in the menu highlighting all instances when one of them was viewed.

Luckily the active trail calculation is done in a service and it was simple to modify the default behaviour.

Read on to see how we did it.