NavView: Navigation does not work when using Narrator in Scan Mode (#7274)

Author: kmahone

dev/NavigationView/NavigationViewItemAutomationPeer.cpp

@@ -46,6 +46,9 @@ winrt::hstring NavigationViewItemAutomationPeer::GetNameCore()
 
 winrt::IInspectable NavigationViewItemAutomationPeer::GetPatternCore(winrt::PatternInterface const& pattern)
 {
+    // Note: We are intentionally not supporting Invoke Pattern, since supporting both SelectionItem and Invoke was
+    // causing problems. 
+    // See this Issue for more details: https://github.com/microsoft/microsoft-ui-xaml/issues/2702
     if (pattern == winrt::PatternInterface::SelectionItem ||
         // Only provide expand collapse pattern if we have children!
         (pattern == winrt::PatternInterface::ExpandCollapse && HasChildren()))
@@ -365,6 +368,11 @@ void NavigationViewItemAutomationPeer::RemoveFromSelection()
 
 void NavigationViewItemAutomationPeer::ChangeSelection(bool isSelected)
 {
+    // If the item is being selected, we trigger an invoke as if the user had clicked on the item:
+    if(isSelected)
+    {
+        Invoke();
+    }
     if (auto nvi = Owner().try_as<winrt::NavigationViewItem>())
     {
         nvi.IsSelected(isSelected);

dev/NavigationView/NavigationView_InteractionTests/SelectionTests.cs

@@ -350,6 +350,28 @@ public void VerifySelectedItemInInvokedItem()
                 Verify.AreEqual("ItemWasInvokedSecomdTimeWithCorrectSelection", result.GetText());
             }
         }
+		
+        [TestMethod]
+        public void VerifySelectionItemPatternDoesInvoke()
+        {
+            // When using UIA SelectionItem pattern to select a navview item, this should also trigger an
+            // invoke on the item.
+            using (var setup = new TestSetupHelper(new[] { "NavigationView Tests", "NavigationView Test" }))
+            {
+                var musicItem = FindElement.ByName("Music");
+                var lvi = new ListViewItem(musicItem);
+
+                lvi.Select();
+                Wait.ForIdle();
+
+                Log.Comment("Verify item was invoked");
+                var result = new TextBlock(FindElement.ByName("InvokedItemState"));
+                Verify.AreEqual("ItemWasSelectedInItemInvoked", result.GetText());
+
+                Log.Comment("Verify item got selected");
+                Verify.IsTrue(Convert.ToBoolean(musicItem.GetProperty(UIProperty.Get("SelectionItem.IsSelected"))));
+            }
+        }
 
         [TestMethod]
         public void VerifyNavigationViewItemIsSelectedWorks()