uiautomationcore: Add UiaGetReservedMixedAttributeValue stub.

dlls/uiautomationcore/uia_main.c

@@ -47,6 +47,16 @@ BOOL WINAPI UiaClientsAreListening(void)
 }
 
 /***********************************************************************
+ *          UiaGetReservedMixedAttributeValue (uiautomationcore.@)
+ */
+HRESULT WINAPI UiaGetReservedMixedAttributeValue(IUnknown **value)
+{
+    FIXME("(%p) stub!\n", value);
+    *value = NULL;
+    return S_OK;
+}
+
+/***********************************************************************
  *          UiaLookupId (uiautomationcore.@)
  */
 int WINAPI UiaLookupId(enum AutomationIdentifierType type, const GUID *guid)

dlls/uiautomationcore/uiautomationcore.spec

@@ -59,7 +59,7 @@
 @ stub UiaGetErrorDescription
 @ stub UiaGetPatternProvider
 @ stub UiaGetPropertyValue
-@ stub UiaGetReservedMixedAttributeValue
+@ stdcall UiaGetReservedMixedAttributeValue(ptr)
 @ stub UiaGetReservedNotSupportedValue
 @ stub UiaGetRootNode
 @ stub UiaGetRuntimeId

include/uiautomationcoreapi.h

@@ -48,6 +48,7 @@ enum AutomationIdentifierType
     AutomationIdentifierType_TextAttribute
 };
 
+HRESULT WINAPI UiaGetReservedMixedAttributeValue(IUnknown **value);
 int WINAPI UiaLookupId(enum AutomationIdentifierType type, const GUID *guid);
 BOOL WINAPI UiaPatternRelease(HUIAPATTERNOBJECT hobj);
 BOOL WINAPI UiaTextRangeRelease(HUIATEXTRANGE hobj);