playbin3 and playsink : Don't send seek event to only one sink
@bilboed
Submitted by Edward Hervey Link to original bug (#796562)
Description
Currently playsink only forwards seek events for one sink.
The problem is that with playbin3 we want to be able to support any number of sources and/or seek handlers.
Sending seek events to all sinks is trivial ... but there are quite a few elements out there that don't properly handle receive multiple seek (with the same seqnum) in a row.
I'm opening this bug to not forget about it.