[Bug 31954] Second Sight hangs with a black screen after the intro videos

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=31954

--- Comment #38 from Paul Gofman <gofmanp at gmail.com> ---
I've got some more details now after more testing, it looks like sync or async
result for read and write differs between Windows versions and preconditions
(likely by the data availability in cache). But when the file is created with
FILE_FLAG_NO_BUFFERING (which I checked is actually the case for Second Sight
demo), it looks like async return is consistent. I refined my patch this way
and going to suggest it upstream with the test.

The patch "Alternative 1" from Bug 42982 looks incorrect to me in a sense that
non-zero overlapped parameter in kernel32.ReadFile() does not imply async read.
Really "overlapped" read is requested by FILE_FLAG_OVERLAPPED given to
CreateFile(), otherwise this parameter can be just used to specify position for
sync read. Regarding doing the read really asynchronous, I suppose it is
completely distinct change which most likely would benefit from some heuristics
when it is worth doing.

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