Fix modal Crash after closing DesktopPopupSiteBridge (#15384)

* visual studio 2026 strict check fix

* Fix  Crash after closing DesktopPopupSiteBridge

* Change files

* yarn lint:fix amd format

* remove debug logs

* Revert "visual studio 2026 strict check fix"

* visual studio 2026 strict check fix

* nit comment

Author: iamAbhi-916

change/react-native-windows-5bdf4573-dfbe-41fd-9dc0-4c4a7119957e.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Fix  Crash after closing DesktopPopupSiteBridge",
+  "packageName": "react-native-windows",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

vnext/Microsoft.ReactNative/Fabric/Composition/Modal/WindowsModalHostViewComponentView.cpp

@@ -35,26 +35,38 @@ struct ModalHostState
 struct ModalHostView : public winrt::implements<ModalHostView, winrt::Windows::Foundation::IInspectable>,
                        ::Microsoft::ReactNativeSpecs::BaseModalHostView<ModalHostView> {
   ~ModalHostView() {
-    if (m_reactNativeIsland) {
-      m_reactNativeIsland.Island().Close();
-    }
+    if (m_popUp) {
+      // Unregister closing event handler
+      if (m_appWindow && m_appWindowClosingToken) {
+        m_appWindow.Closing(m_appWindowClosingToken);
+        m_appWindowClosingToken.value = 0;
+      }
 
-    // Add AppWindow closing token cleanup
-    if (m_appWindow && m_appWindowClosingToken) {
-      m_appWindow.Closing(m_appWindowClosingToken);
-      m_appWindowClosingToken.value = 0;
-    }
+      // Reset topWindowID before destroying
+      if (m_prevWindowID) {
+        winrt::Microsoft::ReactNative::ReactCoreInjection::SetTopLevelWindowId(
+            m_reactContext.Properties().Handle(), m_prevWindowID);
+        m_prevWindowID = 0;
+      }
 
-    if (m_popUp) {
-      if (m_departFocusToken && !m_popUp.IsClosed()) {
-        // WASDK BUG: InputFocusNavigationHost::GetForSiteBridge fails on a DesktopPopupSiteBridge
-        // https://github.com/microsoft/react-native-windows/issues/14604
-        /*
-        auto navHost =
-        winrt::Microsoft::UI::Input::InputFocusNavigationHost::GetForSiteBridge(m_popUp.as<winrt::Microsoft::UI::Content::IContentSiteBridge>());
-        navHost.DepartFocusRequested(m_departFocusToken);
-        */
+      // Close island
+      if (m_reactNativeIsland) {
+        m_reactNativeIsland.Island().Close();
+        m_reactNativeIsland = nullptr;
+      }
+
+      // Hide popup
+      if (m_popUp.IsVisible()) {
+        m_popUp.Hide();
+      }
+
+      // Destroy AppWindow this automatically resumes parent window to receive inputs
+      if (m_appWindow) {
+        m_appWindow.Destroy();
+        m_appWindow = nullptr;
       }
+
+      // Close bridge
       m_popUp.Close();
       m_popUp = nullptr;
     }
@@ -88,7 +100,7 @@ struct ModalHostView : public winrt::implements<ModalHostView, winrt::Windows::F
         QueueShow(view);
       } else {
         m_visible = false;
-        CloseWindow();
+        HideWindow();
       }
     }
 
@@ -219,31 +231,27 @@ struct ModalHostView : public winrt::implements<ModalHostView, winrt::Windows::F
     }
   }
 
-  void CloseWindow() noexcept {
-    // enable input to parent before closing the modal window, so focus can return back to the parent window
-    EnableWindow(m_parentHwnd, true);
+  /*
+  HideWindow called on visible=false
+  unmounts the modal window using onDismiss event
+  */
+  void HideWindow() noexcept {
+    // Hide popup
     if (m_popUp) {
       m_popUp.Hide();
     }
 
-    // Unregister closing event handler
-    if (m_appWindow && m_appWindowClosingToken) {
-      m_appWindow.Closing(m_appWindowClosingToken);
-      m_appWindowClosingToken.value = 0;
+    // Restore message routing to parent
+    if (m_prevWindowID) {
+      winrt::Microsoft::ReactNative::ReactCoreInjection::SetTopLevelWindowId(
+          m_reactContext.Properties().Handle(), m_prevWindowID);
     }
 
-    // dispatch onDismiss event
+    // Dispatch onDismiss event
     if (auto eventEmitter = EventEmitter()) {
       ::Microsoft::ReactNativeSpecs::ModalHostViewEventEmitter::OnDismiss eventArgs;
       eventEmitter->onDismiss(eventArgs);
     }
-
-    // reset the topWindowID
-    if (m_prevWindowID) {
-      winrt::Microsoft::ReactNative::ReactCoreInjection::SetTopLevelWindowId(
-          m_reactContext.Properties().Handle(), m_prevWindowID);
-      m_prevWindowID = 0;
-    }
   }
 
   // creates a new modal window