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codecs: mpeg2decoder: drain() only when significant sequence changes.

He Junyan requested to merge He_Junyan/gstreamer:mpeg2_new_seq into main

There are a lot of info in the mpeg2's sequence(also including ext display_ext and scalable_ext). We need to notify the subclass about its change, but not all the changes should trigger a drain(), which may change the output picture order. For example, the matrix changes in sequence header does not change the decoder context and so no need to trigger a drain().

Fixes: #899 (closed)

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