Re: [PATCH v6 0/13] MR9489: mf: Fix seeking within sample grabber.

[Brendan McGrath (＠redmcg)]

Marking this as ready as I have:
- fixed the failing Win 10 test. The problem was the timer was triggered via `MFInvokeCallback`. This makes it asynchronous (as it goes via the work queue), so I had to add an event to synchronise.
- added commit 8092ec5 to test pause and resume, which shows Windows will always request four more samples, no matter how many are already queued (which seems like a Windows bug to me).

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https://gitlab.winehq.org/wine/wine/-/merge_requests/9489#note_124276