[PATCH v3] oleacc: Add support for retrieving an HWND from accNavigate to WindowFromAccessibleObject.

[Piotr Caban]

Hi Connor,

I'm afraid it's not moving in right direction. It's partially caused by 
returning success and NULL window in some of the tests. While it may be 
interesting to test we end testing corner behavior only. Some paths in 
native implementation accepts NULL HWND while other not - it may lead to 
wrong conclusions.

What do you think about something like in attached diff (generated on 
top of your patch)? Please note that I didn't test it well. It would be 
good to understand what SID_AccessibilityUnk is for.

Thanks,
Piotr
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