[PATCH v4 0/5] MR6783: winegstreamer: Fix a memory/resource leak.

[Conor McCarthy (＠cmccarthy)]

References held by contained stream objects must use an internal refcount, otherwise they prevent release of the media source if Start() and Shutdown() are not called.

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  v4: winegstreamer: Release stream references to the media source in Shutdown().
      winegstreamer: Do not create MF stream objects until the media source is started.
      mfplat/tests: Test video stream release after media source release.
      mfplat/tests: Add more media source refcount checks.
      mfplat/tests: Always free media events sent to the callback.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/6783