[PATCH v6 0/7] MR140: qasf: More ASF reader filter implementation.

[Rémi Bernon (@rbernon)]

> So yes, we could not block in IWMReader::Stop(), but that's not 
> ultimately going to help anything. We do still need to wait for the 
> streaming thread to stop at some point.

Well we could then call `Stop` and wait for the WMT_STOPPED callback notification with a condition variable, releasing the filter_cs so the callbacks are free to enter it to make the thread-safety obviously correct.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/140#note_3436