Nasty solution for resizing and moving clip support in Editor

NastySolutionForResizingClipsInEditor.cs

//[Omitted...]
public class CustomTransformationTrack : TrackAsset
{
	public override Playable CreateTrackMixer(PlayableGraph graph, GameObject go, int inputCount)
    {
        var mixer = ScriptPlayable<CustomTransformationMixerBehaviour>.Create (graph, inputCount);

#if UNITY_EDITOR
		CustomTransformationMixerBehaviour behaviour = mixer.GetBehaviour();
		behaviour.CustomTrackReference = this;
#endif

		foreach (var clip in GetClips())
		{
			var customClip = clip.asset as CustomTransformationClip;
			if (customClip != null)
			{
				customClip.CustomClipStart = clip.start;
				customClip.CustomClipEnd = clip.end;
			}
		}

		return mixer;
    }
    
    //[Omitted...]
}

//[Omitted...]
public class CustomTransformationMixerBehaviour : PlayableBehaviour
{
	private bool _firstFrameHappened;
	private Quaternion _defaultRotation;
	private Transform trackBinding;

#if UNITY_EDITOR
	public CustomTransformationTrack CustomTrackReference { get; set; }
#endif

	public override void ProcessFrame(Playable playable, FrameData info, object playerData)
    {
        trackBinding = playerData as Transform;

		if (!trackBinding)
			{ return; }

		int inputCount = playable.GetInputCount();
		if (inputCount == 0)
			{ return; }

		if (!_firstFrameHappened)
		{
			_defaultRotation = trackBinding.rotation;
			_firstFrameHappened = true;
		}

#if UNITY_EDITOR
		TimelineClip[] clips = CustomTrackReference.GetClips().ToArray();
#endif

		double playTime = playable.GetGraph().GetRootPlayable(0).GetTime();
		Quaternion rotation = Quaternion.identity;

		for (int i = 0; i < inputCount; i++)
		{
			var inputPlayable = (ScriptPlayable<CustomTransformationBehaviour>)playable.GetInput(i);
			CustomTransformationBehaviour input = inputPlayable.GetBehaviour();

      //I'm just hoping 'i' matches the clip array at this point. Please DON'T do this.
#if UNITY_EDITOR
			input.CustomClipStart = clips[i].start;
			input.CustomClipEnd = clips[i].end;
#endif

			double customDuration = input.CustomClipEnd - input.CustomClipStart;
			float normalizedClipPosition = Mathf.Clamp01((float)((playTime - input.CustomClipStart) / customDuration));
			float rotationToAdd = input.GetAngle(normalizedClipPosition);
			rotation *= Quaternion.Euler(Vector3.right * rotationToAdd);
		}

		trackBinding.rotation = _defaultRotation * rotation;
	}

	public override void OnGraphStop(Playable playable)
	{
		if (trackBinding != null)
			{ trackBinding.rotation = _defaultRotation; }

		base.OnGraphStop(playable);
	}
}