[Bug 760408] New: #750013 (streamsynchronizer patches) broke some use cases in GES

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760408

            Bug ID: 760408
           Summary: #750013 (streamsynchronizer patches) broke some use
                    cases in GES
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: blocker
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: mduponchelle1 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 318679
  --> https://bugzilla.gnome.org/attachment.cgi?id=318679&action=edit
fixes the reported issue

This patch broke some seeking cases in GES.

How to reproduce:

mkdir ges_issue && cd ges_issue

wget https://people.collabora.com/~meh/ges_test_assets/test.ogv
wget https://people.collabora.com/~meh/ges_test_assets/reproduced.xges
wget
https://people.collabora.com/~meh/ges_test_assets/play-pause-and-seek.scenario

GES needs to have been compiled with validate support.

ges-launch-1.0 --load reproduced.xges --set-scenario
./play-pause-and-seek.scenario --ges-sample-paths file://$PWD

Issue: playback stops for 5 seconds before restarting after the seek, it should
restart immediataly.

The attached patch fixes the issue.

Problem description in commit message.

Sebastian asked whether I saw other places in streamsynchronizer where flushing
streams should be ignored, a quick glance showed me nothing obvious.

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