[Bug 764939] basesink: deadlock caused by klass->wait_event() which leaves preroll mutex locked

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764939

--- Comment #15 from mariuszb <mariusz.buras at gmail.com> ---
In our use case, which is HLS, if we called basesink event() straight from our
funsink_event() then we wouldn't be able to seek or pause for the remaining few
seconds of the stream. This is why we've deferred the call to the base class.
When that eventually happens gst_fun_sink_wait_until_empty() will return
immediatly becasuse it's already called from decoder fifo empty handler.

We shouldn't be calling gst_fun_sink_wait_until_empty() in the example above
because it has no effect.

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