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v8: winegstreamer: Send media source shutdown notification via IMFMediaShutdownNotify.
mf: Introduce IMFMediaShutdownNotify for notification of media source shutdown.
mf: Handle media source Start() failure due to source shutdown.
mf: Handle media source event subscription failure due to source shutdown.
mf: Handle media source BeginGetEvent() failure due to shutdown.
mf: Handle media source EndGetEvent() failure due to shutdown.
mf/tests: Add tests for shutting down a media source used in a session.
https://gitlab.winehq.org/wine/wine/-/merge_requests/6800
This simplifies future tests that check for object name of devices.
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v2: server: Fix object name resolution of \Device\Null.
server: Make explicit the ownership of the unix_name buffer.
https://gitlab.winehq.org/wine/wine/-/merge_requests/475