2 files changed, 87 insertions, 0 deletions
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Extensions/TrackExtensions.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Extensions/TrackExtensions.cs
new file mode 100644
index 0000000..87eec1b
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Extensions/TrackExtensions.cs
@@ -0,0 +1,76 @@
+using System;
+using UnityEngine;
+using UnityEngine.Timeline;
+using UnityEngine.Playables;
+
+namespace UnityEngine.Timeline
+{
+    /// <summary>
+    /// Extension methods for TrackAssets
+    /// </summary>
+    public static class TrackAssetExtensions
+    {
+        /// <summary>
+        /// Gets the GroupTrack this track belongs to.
+        /// </summary>
+        /// <param name="asset">The track asset to find the group of</param>
+        /// <returns>The parent GroupTrack or null if the Track is an override track, or root track.</returns>
+        public static GroupTrack GetGroup(this TrackAsset asset)
+        {
+            if (asset == null)
+                return null;
+
+            return asset.parent as GroupTrack;
+        }
+
+        /// <summary>
+        /// Assigns the track to the specified group track.
+        /// </summary>
+        /// <param name="asset">The track to assign.</param>
+        /// <param name="group">The GroupTrack to assign the track to.</param>
+        /// <remarks>
+        /// Does not support assigning to a group in a different timeline.
+        /// </remarks>
+        public static void SetGroup(this TrackAsset asset, GroupTrack group)
+        {
+            const string undoString = "Reparent";
+
+            if (asset == null || asset == group || asset.parent == group)
+                return;
+
+            if (group != null && asset.timelineAsset != group.timelineAsset)
+                throw new InvalidOperationException("Cannot assign to a group in a different timeline");
+
+
+            TimelineUndo.PushUndo(asset, undoString);
+
+            var timeline = asset.timelineAsset;
+            var parentTrack = asset.parent as TrackAsset;
+            var parentTimeline = asset.parent as TimelineAsset;
+            if (parentTrack != null || parentTimeline != null)
+            {
+                TimelineUndo.PushUndo(asset.parent, undoString);
+                if (parentTimeline != null)
+                {
+                    parentTimeline.RemoveTrack(asset);
+                }
+                else
+                {
+                    parentTrack.RemoveSubTrack(asset);
+                }
+            }
+
+            if (group == null)
+            {
+                TimelineUndo.PushUndo(timeline, undoString);
+                asset.parent = asset.timelineAsset;
+                timeline.AddTrackInternal(asset);
+            }
+            else
+            {
+                TimelineUndo.PushUndo(group, undoString);
+                group.AddChild(asset);
+            }
+        }
+    }
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Extensions/TrackExtensions.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Extensions/TrackExtensions.cs.meta
new file mode 100644
index 0000000..823e94a
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Extensions/TrackExtensions.cs.meta
@@ -0,0 +1,11 @@
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