[Bug 775051] New: nlecomposition: validate: decodebin2 reaching code path that should not be reached when running scrub_forward_seeking on GES timelines

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775051

            Bug ID: 775051
           Summary: nlecomposition: validate: decodebin2 reaching code
                    path that should not be reached when running
                    scrub_forward_seeking on GES timelines
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-editing-services
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: tsaunier at gnome.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 340716
  --> https://bugzilla.gnome.org/attachment.cgi?id=340716&action=edit
2,*nle*:5,*decodebin*:5 debug log

Validate tests: ges.playback.scrub_.*_seeking.test_mixing\..*

Failure example:
https://ci.gstreamer.net/job/GStreamer-master-meson-validate/135/testReport/junit/ges.playback.scrub_forward_seeking.test_mixing/audio_video/vorbis_theora_ogg/

This issues happens when we tear down the pipeline at the very end of the
scenario, basically:

* The nlecomposition is rebuilding the sub pipeline because of an EOS
* The composition state is set to READY
* The composition stops its children management tasks
* The composition sets its children state to READY itself

The error happens at that time.

I have the impression it is quite related to
https://bugzilla.gnome.org/show_bug.cgi?id=774480 as we are setting the
children state to READY before we actually link up the `change_state` vmethod
implementation.

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