msctf/tests: Test ITfKeystrokeMgr::UnpreserveKey and ITfKeystrokeMgr::PreserveKey.
diff --git a/include/msctf.idl b/include/msctf.idl
index a78552d..9255fea 100644
--- a/include/msctf.idl
+++ b/include/msctf.idl
@@ -24,6 +24,7 @@
#endif
cpp_quote("#define TF_E_STACKFULL MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0x0501)")
+cpp_quote("#define TF_E_ALREADY_EXISTS MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0x0506)")
cpp_quote("EXTERN_C const CLSID CLSID_TF_ThreadMgr;")
cpp_quote("EXTERN_C const CLSID CLSID_TF_InputProcessorProfiles;")
cpp_quote("EXTERN_C const CLSID CLSID_TF_CategoryMgr;")