fix: update title after navigation (#20047) (CP: 24.5)

flow-server/src/main/java/com/vaadin/flow/component/internal/UIInternals.java

@@ -699,12 +699,8 @@ public boolean containsPendingJavascript(String containsFilter) {
      */
     public void setTitle(String title) {
         assert title != null;
-        JavaScriptInvocation invocation = new JavaScriptInvocation("""
-                    document.title = $0;
-                    if(window?.Vaadin?.documentTitleSignal) {
-                        window.Vaadin.documentTitleSignal.value = $0;
-                    }
-                """.stripIndent(), title);
+        JavaScriptInvocation invocation = new JavaScriptInvocation(
+                generateTitleScript().stripIndent(), title);
 
         pendingTitleUpdateCanceler = new PendingJavaScriptInvocation(
                 getStateTree().getRootNode(), invocation);
@@ -713,6 +709,23 @@ public void setTitle(String title) {
         this.title = title;
     }
 
+    private String generateTitleScript() {
+        String setTitleScript = """
+                    document.title = $0;
+                    if(window?.Vaadin?.documentTitleSignal) {
+                        window.Vaadin.documentTitleSignal.value = $0;
+                    }
+                """;
+        if (getSession().getConfiguration().isReactEnabled()) {
+            // For react-router we should wait for navigation to finish
+            // before updating the title.
+            setTitleScript = String.format(
+                    "if(window.Vaadin.Flow.navigation) { window.addEventListener('vaadin-navigated', function(event) {%s}, {once:true}); }  else { %1$s }",
+                    setTitleScript);
+        }
+        return setTitleScript;
+    }
+
     /**
      * Records the text content of the title tag in the application shell.
      * <p>

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

@@ -151,13 +151,16 @@ function extractPath(event: MouseEvent): void | string {
  * @param search search of navigation
  */
 function fireNavigated(pathname:string, search: string) {
-    setTimeout(() =>
-        window.dispatchEvent(new CustomEvent('vaadin-navigated', {
-            detail: {
-                pathname,
-                search
-            }
-        }))
+    setTimeout(() => {
+            window.dispatchEvent(new CustomEvent('vaadin-navigated', {
+                detail: {
+                    pathname,
+                    search
+                }
+            }));
+            // @ts-ignore
+            delete window.Vaadin.Flow.navigation;
+        }
     )
 }
 
@@ -255,6 +258,8 @@ function Flow() {
     }, [navigate]);
 
     const vaadinNavigateEventHandler = useCallback((event: CustomEvent<{state: unknown, url: string, replace?: boolean, callback: boolean}>) => {
+        // @ts-ignore
+        window.Vaadin.Flow.navigation = true;
         const path = '/' + event.detail.url;
         navigated.current = !event.detail.callback;
         fromAnchor.current = false;

flow-tests/test-root-context/src/test/java/com/vaadin/flow/uitest/ui/PageIT.java

@@ -9,6 +9,7 @@
 import org.openqa.selenium.By;
 import org.openqa.selenium.JavascriptExecutor;
 import org.openqa.selenium.Keys;
+import org.openqa.selenium.TimeoutException;
 
 import com.vaadin.flow.component.html.testbench.DivElement;
 import com.vaadin.flow.component.html.testbench.InputTextElement;
@@ -52,8 +53,12 @@ public void testPageTitleClears() {
     }
 
     private void verifyTitle(String title) {
-        Assert.assertEquals("Page title does not match", title,
-                getDriver().getTitle());
+        try {
+            waitUntil(driver -> driver.getTitle().equals(title));
+        } catch (TimeoutException te) {
+            Assert.fail("Page title does not match. Expected: " + title
+                    + ", Actual: " + driver.getTitle());
+        }
     }
 
     private void updateTitle(String title) {