public IEnumerator ShowFrameMarkers()
        {
            PlayableDirector director = EditorUtilityTest.NewSceneWithDirector();
            TimelineClip     clip     = EditorUtilityTest.CreateTestTimelineClip(director);
            StreamingImageSequencePlayableAsset sisAsset = clip.asset as StreamingImageSequencePlayableAsset;

            Assert.IsNotNull(sisAsset);
            yield return(null);

            //Show
            TimelineClipSISData timelineClipSISData = sisAsset.GetBoundTimelineClipSISData();

            TrackAsset trackAsset = clip.parentTrack;

            timelineClipSISData.RequestFrameMarkers(true, true);
            TimelineEditor.Refresh(RefreshReason.ContentsModified);
            yield return(null);

            Assert.AreEqual(TimelineUtility.CalculateNumFrames(clip), trackAsset.GetMarkerCount());
            yield return(null);


            //Undo showing FrameMarkers
            EditorUtilityTest.UndoAndRefreshTimelineEditor(); yield return(null);

            Assert.False(timelineClipSISData.AreFrameMarkersRequested());
            Assert.AreEqual(0, trackAsset.GetMarkerCount());


            EditorUtilityTest.DestroyTestTimelineAssets(clip);
            yield return(null);
        }
        public IEnumerator ResizePlayableAsset()
        {
            PlayableDirector director = EditorUtilityTest.NewSceneWithDirector();
            TimelineClip     clip     = EditorUtilityTest.CreateTestTimelineClip(director);
            StreamingImageSequencePlayableAsset sisAsset = clip.asset as StreamingImageSequencePlayableAsset;

            Assert.IsNotNull(sisAsset);
            TimelineClipSISData timelineClipSISData = sisAsset.GetBoundTimelineClipSISData();

            yield return(null);

            timelineClipSISData.RequestFrameMarkers(true);
            Undo.IncrementCurrentGroup(); //the base of undo is here. FrameMarkerVisibility is still true after undo
            TimelineEditor.Refresh(RefreshReason.ContentsModified);
            yield return(null);

            //Original length
            TrackAsset trackAsset = clip.parentTrack;

            Assert.AreEqual(TimelineUtility.CalculateNumFrames(clip), trackAsset.GetMarkerCount());
            double origClipDuration = clip.duration;

            //Resize longer
            EditorUtilityTest.ResizeSISTimelineClip(clip, origClipDuration + 3.0f); yield return(null);

            Assert.AreEqual(TimelineUtility.CalculateNumFrames(clip), trackAsset.GetMarkerCount());

            //Undo
            EditorUtilityTest.UndoAndRefreshTimelineEditor(); yield return(null);

            Assert.AreEqual(origClipDuration, clip.duration);
            Assert.AreEqual(TimelineUtility.CalculateNumFrames(clip), trackAsset.GetMarkerCount());

            //Resize shorter
            EditorUtilityTest.ResizeSISTimelineClip(clip, Mathf.Max(0.1f, ((float)(origClipDuration) - 3.0f))); yield return(null);

            Assert.AreEqual(TimelineUtility.CalculateNumFrames(clip), trackAsset.GetMarkerCount());

            //Undo
            EditorUtilityTest.UndoAndRefreshTimelineEditor(); yield return(null);

            Assert.AreEqual(origClipDuration, clip.duration);
            Assert.AreEqual(TimelineUtility.CalculateNumFrames(clip), trackAsset.GetMarkerCount());


            EditorUtilityTest.DestroyTestTimelineAssets(clip);
            yield return(null);
        }