[BUGFIX] Implemented Andrey Timofeev fix to IndexOutOfRangeException introduced in Sequences in DOTween 1.2.060

UnityTests.Unity5/Assets/_Tests/Bugs/IndexOutOfRange04.cs

@@ -0,0 +1,72 @@
+using DG.Tweening;
+using System.Collections;
+using UnityEngine;
+
+// Code to replicate by Andrey Timofeev: https://github.com/Demigiant/dotween/pull/288/files#diff-0
+public class IndexOutOfRange04 : BrainBase
+{
+    public static int updateCounter = -1;
+
+    int _callCounter = 0;
+
+    void Start()
+    {
+        Time.maximumDeltaTime = 0.02f;
+        DOTween.Init(true, true, LogBehaviour.Verbose);
+        DOTween.SetTweensCapacity(1000, 1000);
+        StartCoroutine(CoTest());
+    }
+
+    IEnumerator CoTest()
+    {
+        updateCounter = -1;
+        yield return null;
+        yield return null;
+        yield return null;
+        updateCounter = 0;
+
+        StartSequence(0.75f, true); // callNumber 1
+
+        yield return new WaitForSeconds(0.5f);
+
+        var t0 = StartSequence(0.75f, false); // callNumber 2
+
+        yield return new WaitForSeconds(0.5f);
+
+        var t1 = StartSequence(99999f, false); // callNumber 3
+        StartSequence(99999f, false); // callNumber 4
+
+        while (t1.active) yield return null;
+//        while (t0.active) yield return null;
+        Debug.Log("Done waiting for tween");
+
+        StartSequence(99999f, true); // callNumber 5
+    }
+
+    Tweener StartSequence(float duration, bool failStart)
+    {
+        int callNumber = ++_callCounter;
+        Debug.Log(string.Format("StartSequence, callNumber:{0} duration:{1} failStart:{2}", callNumber, duration, failStart));
+
+        GameObject go = new GameObject(callNumber.ToString());
+
+        var sequence = DOTween.Sequence();
+        var tweener = go.transform.DOMoveX(callNumber + 1000, duration);
+        sequence.Append(tweener);
+
+        if (failStart) {
+            Debug.Log(string.Format("Destroying gameobject, callNumber {0}", callNumber));
+            Destroy(go);
+        }
+
+        return tweener;
+    }
+
+    void Update()
+    {
+//        if (updateCounter >= 0) {
+//            Debug.Log(string.Format("Update {0}, time: {1}", updateCounter, Time.time));
+//            ++updateCounter;
+//        }
+    }
+}

UnityTests.Unity5/Assets/_Tests/Bugs/IndexOutOfRange04.cs.meta

@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: ccbd60edbcb37524dac83a3c0381ec1e
+timeCreated: 1550946250
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

UnityTests.Unity5/Assets/_Tests/Bugs/IndexOutOfRange04.unity.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: f0f1c822430a09140b2a4f0b496a99f4
+timeCreated: 1481284574
+licenseType: Pro
+DefaultImporter:
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

_DOTween.Assembly/DOTween/DOTween.cs

@@ -32,7 +32,7 @@ namespace DG.Tweening
     public class DOTween
     {
         /// <summary>DOTween's version</summary>
-        public static readonly string Version = "1.2.180"; // Last version before modules: 1.1.755
+        public static readonly string Version = "1.2.185"; // Last version before modules: 1.1.755
 
         ///////////////////////////////////////////////
         // Options ////////////////////////////////////

_DOTween.Assembly/DOTween/Sequence.cs

@@ -158,10 +158,9 @@ namespace DG.Tweening
         // Returns TRUE in case of success
         internal static bool DoStartup(Sequence s)
         {
-            if (s.sequencedTweens.Count == 0 && s._sequencedObjs.Count == 0
-                && s.onComplete == null && s.onKill == null && s.onPause == null && s.onPlay == null && s.onRewind == null
-                && s.onStart == null && s.onStepComplete == null && s.onUpdate == null
-            ) return false; // Empty Sequence without any callback set
+            if (s.sequencedTweens.Count == 0 && s._sequencedObjs.Count == 0 && !IsAnyCallbackSet(s)) {
+                return false; // Empty Sequence without any callback set
+            }
 
             s.startupDone = true;
             s.fullDuration = s.loops > -1 ? s.duration * s.loops : Mathf.Infinity;
@@ -268,10 +267,13 @@ namespace DG.Tweening
                         if (!t.startupDone) continue; // since we're going backwards and this tween never started just ignore it
                         t.isBackwards = true;
                         if (TweenManager.Goto(t, gotoPos, false, updateMode)) {
-                            // Nested tween failed. Remove it from Sequence and continue
-                            // (instead of just returning TRUE, which would kill the whole Sequence as before v1.2.060)
+                            // Nested tween failed. If it's the only tween and there's no callbacks mark for killing the whole sequence
+                            // (default behaviour in any case prior to v1.2.060)...
+                            if (s.sequencedTweens.Count == 1 && s._sequencedObjs.Count == 1 && !IsAnyCallbackSet(s)) return true;
+                            // ...otherwise remove failed tween from Sequence and continue
                             TweenManager.Despawn(t, false);
                             s._sequencedObjs.RemoveAt(i);
+                            s.sequencedTweens.RemoveAt(i);
                             --i; --len;
                             continue;
                         }
@@ -323,10 +325,13 @@ namespace DG.Tweening
                         //
                         t.isBackwards = false;
                         if (TweenManager.Goto(t, gotoPos, false, updateMode)) {
-                            // Nested tween failed. Remove it from Sequence and continue
-                            // (instead of just returning TRUE, which would kill the whole Sequence as before v1.2.060)
+                            // Nested tween failed. If it's the only tween and there's no callbacks mark for killing the whole sequence
+                            // (default behaviour in any case prior to v1.2.060)...
+                            if (s.sequencedTweens.Count == 1 && s._sequencedObjs.Count == 1 && !IsAnyCallbackSet(s)) return true;
+                            // ...otherwise remove failed tween from Sequence and continue
                             TweenManager.Despawn(t, false);
                             s._sequencedObjs.RemoveAt(i);
+                            s.sequencedTweens.RemoveAt(i);
                             --i; --len;
                             continue;
                         }
@@ -362,6 +367,12 @@ namespace DG.Tweening
             }
         }
 
+        static bool IsAnyCallbackSet(Sequence s)
+        {
+            return s.onComplete != null || s.onKill != null || s.onPause != null || s.onPlay != null || s.onRewind != null
+                   || s.onStart != null || s.onStepComplete != null || s.onUpdate != null;
+        }
+
 //        // Quicker but doesn't implement stable sort
 //        static int SortSequencedObjs(ABSSequentiable a, ABSSequentiable b)
 //        {