winex11: Directly use win32u for user functions in window.c.

dlls/winex11.drv/x11drv.h

@@ -850,6 +850,25 @@ static inline UINT get_palette_entries( HPALETTE palette, UINT start, UINT count
     return NtGdiDoPalette( palette, start, count, entries, NtGdiGetPaletteEntries, TRUE );
 }
 
+/* user helpers */
+
+static inline LRESULT send_message( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )
+{
+    return NtUserMessageCall( hwnd, msg, wparam, lparam, NULL, NtUserSendMessage, FALSE );
+}
+
+static inline BOOL send_notify_message( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )
+{
+    return NtUserMessageCall( hwnd, msg, wparam, lparam, 0, NtUserSendNotifyMessage, FALSE );
+}
+
+static inline HWND get_active_window(void)
+{
+    GUITHREADINFO info;
+    info.cbSize = sizeof(info);
+    return NtUserGetGUIThreadInfo( GetCurrentThreadId(), &info ) ? info.hwndActive : 0;
+}
+
 /* registry helpers */
 
 extern HKEY open_hkcu_key( const char *name ) DECLSPEC_HIDDEN;