FIX: Transitioning to tag-intersection route (#23931)

…didn't correctly update location query params.

A followup to 1df3ccc903 (things broke after merging `main` to PR's branch)

spec/system/tags_intersection_spec.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+describe "Tags intersection", type: :system do
+  let(:discovery) { PageObjects::Pages::Discovery.new }
+
+  fab!(:category) { Fabricate(:category, name: "fruits") }
+  fab!(:some_topic) { Fabricate(:topic, category: category) }
+
+  fab!(:tag) { Fabricate(:tag, name: "sour") }
+  fab!(:tag2) { Fabricate(:tag, name: "tangy") }
+  fab!(:some_topic) { Fabricate(:topic, tags: [tag, tag2]) }
+
+  fab!(:the_topic) { Fabricate(:topic, category: category, tags: [tag, tag2]) }
+
+  it "filters by category" do
+    visit("/tags/intersection/sour/tangy?category=fruits")
+
+    expect(page).to have_current_path("/tags/intersection/sour/tangy?category=fruits")
+    expect(discovery.topic_list).to have_topic(the_topic)
+    expect(discovery.topic_list).to have_topics(count: 1)
+
+    visit("/")
+
+    # Confirm that frontend transitions work as well,
+    # even though UI doesn't support that
+    page.execute_script <<~JS
+      require("discourse/lib/url").default.routeTo("/tags/intersection/sour/tangy?category=fruits")
+    JS
+
+    expect(page).to have_current_path("/tags/intersection/sour/tangy?category=fruits")
+    expect(discovery.topic_list).to have_topic(the_topic)
+    expect(discovery.topic_list).to have_topics(count: 1)
+  end
+end