[0.80][Fabric] Fix UIA Clipped Property for Modal Component (#15184)

* [Fabric] Fixing Clipped Property for Modal Component (#15176)

* Fixing Clipped Property for Modal Component

* Yarn Change

* Removed try catch.

* Review Changes

Author: vineethkuttan

change/react-native-windows-aca77b5b-e0c0-4051-bb1d-70c3e69bec86.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "[Fabric] Fixing Clipped Property for Modal Component",
+  "packageName": "react-native-windows",
+  "email": "kvineeth@microsoft.com",
+  "dependentChangeType": "patch"
+}

vnext/Microsoft.ReactNative/Fabric/Composition/CompositionDynamicAutomationProvider.cpp

@@ -561,7 +561,18 @@ HRESULT __stdcall CompositionDynamicAutomationProvider::GetPropertyValue(PROPERT
     }
     case UIA_IsOffscreenPropertyId: {
       pRetVal->vt = VT_BOOL;
-      pRetVal->boolVal = (compositionView->getClipState() == ClipState::FullyClipped) ? VARIANT_TRUE : VARIANT_FALSE;
+
+      // Check if element is offscreen - consider modal content special case
+      bool isOffscreen = (compositionView->getClipState() == ClipState::FullyClipped);
+
+      // Modal content may appear clipped but is visible in its own window
+      if (isOffscreen) {
+        if (const auto hwnd = compositionView->GetHwndForParenting()) {
+          isOffscreen = !(IsWindowVisible(hwnd) && !IsIconic(hwnd));
+        }
+      }
+
+      pRetVal->boolVal = isOffscreen ? VARIANT_TRUE : VARIANT_FALSE;
       break;
     }
     case UIA_HelpTextPropertyId: {