Re: [PATCH v2 0/5] MR6490: winsock: Avoid short writes on nonblocking sockets.

[Paul Gofman (＠gofman)]

v2:

- Add a separate test (which also tests various conditions under which an async send may be cancelled);
 - Handle those various conditions so the background send is not cancelled;
 - Fix CancelIoEx() return value in case there is nothing to cancel (unrelated but trivial and avoids leaving misleading todo in test).