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timeline-element: Do not consider not serializable elements when getting top element
Those are temporary elements that should not be considered when dealing with the hierarchy of objects. Fixes T3455
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@ -1149,7 +1149,8 @@ ges_timeline_element_get_toplevel_parent (GESTimelineElement * self)
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g_return_val_if_fail (GES_IS_TIMELINE_ELEMENT (self), NULL);
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while (GES_TIMELINE_ELEMENT_PARENT (toplevel))
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while (GES_TIMELINE_ELEMENT_PARENT (toplevel) &&
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GES_TIMELINE_ELEMENT_PARENT (toplevel)->priv->serialize)
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toplevel = GES_TIMELINE_ELEMENT_PARENT (toplevel);
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return gst_object_ref (toplevel);
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