Added warning when enhanced navigation falls back to full page reload + test

Author: dariatiurina

src/Components/Web.JS/src/Services/NavigationEnhancement.ts

@@ -455,6 +455,7 @@ function enhancedNavigationIsEnabledForForm(form: HTMLFormElement): boolean {
 function retryEnhancedNavAsFullPageLoad(internalDestinationHref: string) {
   // The ? trick here is the same workaround as described in #10839, and without it, the user
   // would not be able to use the back button afterwards.
+  console.warn(`Enhanced navigation failed for destination ${internalDestinationHref}. Falling back to full page load.`);
   history.replaceState(null, '', internalDestinationHref + '?');
   location.replace(internalDestinationHref);
 }

src/Components/test/E2ETest/ServerRenderingTests/EnhancedNavigationTest.cs

@@ -324,6 +324,10 @@ public void RefreshCanFallBackOnFullPageReload(string renderMode)
         Browser.Exists(By.Id("refresh-with-refresh")).Click();
         Browser.True(() => IsElementStale(initialRenderIdElement));
 
+        //Check if the warning about the fail were logged.
+        var logs = Browser.GetBrowserLogs(LogLevel.Warning);
+        Assert.Contains(logs, log => log.Message.Contains("Enhanced navigation failed for destination") && !log.Message.Contains("Error"));
+
         var finalRenderIdElement = Browser.Exists(By.Id("render-id"));
         var finalRenderId = -1;
         Browser.True(() => int.TryParse(finalRenderIdElement.Text, out finalRenderId));