[Bug 777522] New: parsebin: Clear drained mark with FLUSH_STOP

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777522

            Bug ID: 777522
           Summary: parsebin: Clear drained mark with FLUSH_STOP
    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: ---

A demuxer might re-expose source pads during playback
(e.g., program update in tsdemux).
When pads are re-exposed, EOS event will be pushed to the old source
pads by demuxer, and group switching is triggered by the EOS event.
Note that the EOS will mark "drained" to chain/group and
parsebin refers to the "drained" marks for chain/group switching.

However, since the "drained" marks never be cleared once it was set,
following sequence cannot be handled
  * demuxer pushed EOS and parsebin marked the chain/group as drained
  * seek event happened
  * demuxer source pads are re-exposed

To handle above case, "drained" marks should be cleared by flush-stop

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