fix: Evaluate target not active (#19945) (#19950)

For deciding what action to
take we should evaluate where
we are going and not the current
active path.

Fixes vaadin/hilla#2726

Co-authored-by: caalador <mikael.grankvist@vaadin.com>

flow-server/src/main/resources/com/vaadin/flow/server/frontend/Flow.tsx

@@ -244,7 +244,7 @@ function Flow() {
             fromAnchor.current = false;
             const {pathname, search} = blocker.location;
             const routes = ((window as any)?.Vaadin?.routesConfig || []) as AgnosticRouteObject[];
-            let matched = matchRoutes(Array.from(routes), window.location.pathname);
+            let matched = matchRoutes(Array.from(routes), pathname);
 
             // Navigation between server routes
             // @ts-ignore