[unity] Fixed Timeline SpineAnimationStateTrack not showing `Track Index` parameter in Inspector at older Unity versions. Closes #1558.

spine-unity/Modules/com.esotericsoftware.spine.timeline/Editor/SpineAnimationStateTrackInspector.cs

@@ -0,0 +1,52 @@
+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated May 1, 2019. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2019, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software
+ * or otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, BUSINESS
+ * INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND ON ANY
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+ *****************************************************************************/
+
+using UnityEditor;
+using Spine.Unity.Playables;
+using UnityEngine.Timeline;
+
+namespace Spine.Unity.Editor {
+
+	[CustomEditor(typeof(SpineAnimationStateTrack))]
+	[CanEditMultipleObjects]
+	public class SpineAnimationStateTrackInspector : UnityEditor.Editor {
+
+		protected SerializedProperty trackIndexProperty = null;
+
+		public void OnEnable () {
+			trackIndexProperty = serializedObject.FindProperty("trackIndex");
+		}
+
+		public override void OnInspectorGUI () {
+			serializedObject.Update();
+			EditorGUILayout.PropertyField(trackIndexProperty);
+			serializedObject.ApplyModifiedProperties();
+		}
+	}
+}

spine-unity/Modules/com.esotericsoftware.spine.timeline/Editor/SpineAnimationStateTrackInspector.cs.meta

@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: b7c44d5bdbe0db14d936722a800d757b
+timeCreated: 1575309732
+licenseType: Free
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: