uiautomationcore: Add UiaEventAddWindow stub.

dlls/uiautomationcore/uia_client.c

@@ -3022,3 +3022,12 @@ HRESULT WINAPI UiaRemoveEvent(HUIAEVENT huiaevent)
     FIXME("(%p): stub\n", huiaevent);
     return E_NOTIMPL;
 }
+
+/***********************************************************************
+ *          UiaEventAddWindow (uiautomationcore.@)
+ */
+HRESULT WINAPI UiaEventAddWindow(HUIAEVENT huiaevent, HWND hwnd)
+{
+    FIXME("(%p, %p): stub\n", huiaevent, hwnd);
+    return E_NOTIMPL;
+}

dlls/uiautomationcore/uiautomationcore.spec

@@ -57,7 +57,7 @@
 @ stdcall UiaClientsAreListening()
 #@ stub UiaDisconnectAllProviders
 @ stdcall UiaDisconnectProvider(ptr)
-@ stub UiaEventAddWindow
+@ stdcall UiaEventAddWindow(ptr long)
 @ stub UiaEventRemoveWindow
 @ stdcall UiaFind(ptr ptr ptr ptr ptr ptr)
 @ stub UiaGetErrorDescription

include/uiautomationcoreapi.h

@@ -419,6 +419,7 @@ HRESULT WINAPI UiaNavigate(HUIANODE huianode, enum NavigateDirection dir, struct
 HRESULT WINAPI UiaFind(HUIANODE huianode, struct UiaFindParams *find_params, struct UiaCacheRequest *cache_req, SAFEARRAY **out_req,
         SAFEARRAY **out_offsets, SAFEARRAY **out_tree_structs);
 HRESULT WINAPI UiaRemoveEvent(HUIAEVENT huiaevent);
+HRESULT WINAPI UiaEventAddWindow(HUIAEVENT huiaevent, HWND hwnd);
 
 #ifdef __cplusplus
 }