Re: [PATCH v2 0/5] MR2566: uiautomationcore: Initial default ProviderType_BaseHwnd clientside provider implementation.

[Connor McAdams (＠cmcadams)]

V2:

- Don't call `SetLastError()` unnecessarily.
- Return `E_FAIL` by default from `uia_get_hr_for_last_error()` instead of `HRESULT_FROM_WIN32`.
- Return `UIA_E_ELEMENTNOTAVAILABLE` when `GetWindowThreadProcessId` fails, since it will only fail on an invalid window handle.