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When blocking input pads, we also need to properly set the appropriate pending flag. Without this, when switching stream types after initial configuration (like going from Audio+Video to Audio+Video+Sub) playsink would never wait for *all* input streams to be blocked (it would just wait for the new input pad (text in this case) to be blocked). Since the reconfiguration might introduce unlinking/relinking of elements, we need to ensure that *ALL* input streams are blocked. Failure to do so would result in having some input streams pushing data to inactive elements (returning GST_FLOW_FLUSHING) or unlinked pads (returning GST_FLOW_NOT_LINKED). A later optimization could involve only blocking the input pads that might be involved in reconfiguration. But better be safe than sorry for now :)
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