Add timeline tracks sorting option

Source/Editor/GUI/Timeline/Timeline.cs

@@ -1820,6 +1820,10 @@ namespace FlaxEditor.GUI.Timeline
             {
                 menu.AddButton("Edit timeline", () => ShowEditPopup(PropertiesEditObject, ref location, this));
             }
+            if (_tracks.Count > 1)
+            {
+                menu.AddButton("Sort tracks", SortTracks).TooltipText = "Sorts sub tracks alphabetically";
+            }
             menu.AddSeparator();
             menu.AddButton("Reset zoom", () => Zoom = 1.0f);
             menu.AddButton("Show whole timeline", ShowWholeTimeline);
@@ -1827,6 +1831,44 @@ namespace FlaxEditor.GUI.Timeline
             menu.Show(this, location);
         }
 
+        private void SortTracks()
+        {
+            var rootTracks = new List<Track>();
+            foreach (var track in _tracks)
+            {
+                if (track.ParentTrack == null)
+                    rootTracks.Add(track);
+            }
+
+            // TODO: undo for tracks sorting
+            _tracks.Clear();
+            rootTracks.Sort();
+            foreach (var track in rootTracks)
+                CollectTracks(track);
+
+            OnTracksOrderChanged();
+            MarkAsEdited();
+        }
+
+        internal void SortTrack(Track e, Action sort)
+        {
+            var rootTracks = new List<Track>();
+            foreach (var track in _tracks)
+            {
+                if (track.ParentTrack == null)
+                    rootTracks.Add(track);
+            }
+
+            // TODO: undo for tracks sorting
+            _tracks.Clear();
+            sort();
+            foreach (var track in rootTracks)
+                CollectTracks(track);
+
+            OnTracksOrderChanged();
+            MarkAsEdited();
+        }
+
         /// <inheritdoc />
         protected override void PerformLayoutBeforeChildren()
         {

Source/Editor/GUI/Timeline/Track.cs

@@ -1032,6 +1032,10 @@ namespace FlaxEditor.GUI.Timeline
                     menu.AddButton("Expand All", ExpandAll);
                     menu.AddButton("Collapse All", CollapseAll);
                 }
+                if (SubTracks.Count > 1)
+                {
+                    menu.AddButton("Sort All", () => _timeline.SortTrack(this, _subTracks.Sort));
+                }
                 OnContextMenu(menu);
                 menu.Show(this, location);
             }
@@ -1343,6 +1347,18 @@ namespace FlaxEditor.GUI.Timeline
                 base.OnKeyUp(key);
         }
 
+        /// <inheritdoc />
+        public override int Compare(Control other)
+        {
+            if (other is Track otherTrack)
+            {
+                var name = Title ?? Name;
+                var otherName = otherTrack.Title ?? otherTrack.Name;
+                return string.Compare(name, otherName, StringComparison.InvariantCulture);
+            }
+            return base.Compare(other);
+        }
+
         /// <inheritdoc />
         public override void OnDestroy()
         {