[PATCH v2 0/4] MR5412: mfreadwrite/tests: More source reader transform tests.

[Rémi Bernon]

First change also avoids a leak of classes (later activates) when the transform is successfully connected.

The use of MFTEnumEx is necessary so that the tests work, as they use a locally registered transform.

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  v2: mfreadwrite/tests: Test the D3D awareness of source reader transforms.
      mfreadwrite/tests: Test the source reader stream change events.
      mfreadwrite/reader: Make the GetTransformForStream category parameter optional.
      mfreadwrite/reader: Use MFTEnumEx to enumerate stream transforms.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/5412