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autovideoconvert: should not forward the allocation query if no element is selected

elliot chen requested to merge elliot_chen/gstreamer:autovideoconvert-should-not-forward-the-allocation-query-until-subelement-is-selected into main
  1. autovideoconvert always forwards allocation query downstream directly before selecting any sub-element.
  2. If forward this query, it can generate multiple allocation handling and influence the allocation choices of downstream plugins because the caps in this query is often not the final caps. And it can also influence upstream buffer usage if this pool is created.
  3. Should not forward the allocation query if no element is selected

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