[Bug 722767] element: add function to sync element state with target state of the parent

[bugzilla at gnome.org]

https://bugzilla.gnome.org/show_bug.cgi?id=722767

--- Comment #9 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
This would be the simplified version:

Live pipeline in PLAYING with a tee. Two sinks (async=true) are added, synced
state with parent. First sink gets set to PLAYING by sync_state(), pipeline
goes to PAUSED (pending=PAUSED) because it loses state because the sink is
going async to PAUSED. Second sink gets set to PAUSED by sync_state() (because
pipeline is pending=PAUSED). Both sinks get a buffer, nothing ever sets the
second sink to PLAYING (it still has target state PAUSED).

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