[Bug 777009] New: urisourcebin: Never push actual EOS event to slot

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777009

            Bug ID: 777009
           Summary: urisourcebin: Never push actual EOS event to slot
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: sh.yang at lge.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Due to the special nature of adaptivedemux, reconfigure happen
frequently with seek/track-change.
In very exceptional case, following sequence is possible
  * EOS event is pushed to queue element and still buffers are queued
  * During draining remaining buffers, reconfigure event happen from downstream
  * Then, flow return from downstream might not be FLOW_OK

Because non FLOW_OK return will cause element error in queue element,
actual EOS event shouldn't be used.

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