Revert "Fixed https://github.com/Cysharp/UniTask/issues/444"

src/UniTask/Assets/Plugins/UniTask/Runtime/TriggerEvent.cs

@@ -20,6 +20,8 @@ namespace Cysharp.Threading.Tasks
     {
         ITriggerHandler<T> head; // head.prev is last
         ITriggerHandler<T> iteratingHead;
+
+        bool preserveRemoveSelf;
         ITriggerHandler<T> iteratingNode;
 
         void LogError(Exception ex)
@@ -42,7 +44,6 @@ namespace Cysharp.Threading.Tasks
             while (h != null)
             {
                 iteratingNode = h;
-                var next = h.Next;
 
                 try
                 {
@@ -54,8 +55,19 @@ namespace Cysharp.Threading.Tasks
                     Remove(h);
                 }
 
+                if (preserveRemoveSelf)
+                {
+                    preserveRemoveSelf = false;
+                    iteratingNode = null;
+                    var next = h.Next;
+                    Remove(h);
                     h = next;
                 }
+                else
+                {
+                    h = h.Next;
+                }
+            }
 
             iteratingNode = null;
             if (iteratingHead != null)
@@ -85,6 +97,7 @@ namespace Cysharp.Threading.Tasks
                     LogError(ex);
                 }
 
+                preserveRemoveSelf = false;
                 iteratingNode = null;
                 var next = h.Next;
                 Remove(h);
@@ -119,6 +132,7 @@ namespace Cysharp.Threading.Tasks
                     LogError(ex);
                 }
 
+                preserveRemoveSelf = false;
                 iteratingNode = null;
                 var next = h.Next;
                 Remove(h);
@@ -153,6 +167,7 @@ namespace Cysharp.Threading.Tasks
                     LogError(ex);
                 }
 
+                preserveRemoveSelf = false;
                 iteratingNode = null;
                 var next = h.Next;
                 Remove(h);
@@ -226,6 +241,13 @@ namespace Cysharp.Threading.Tasks
         {
             if (handler == null) throw new ArgumentNullException(nameof(handler));
 
+            if (iteratingNode != null && iteratingNode == handler)
+            {
+                // if remove self, reserve remove self after invoke completed.
+                preserveRemoveSelf = true;
+            }
+            else
+            {
                 var prev = handler.Prev;
                 var next = handler.Next;
 
@@ -286,3 +308,4 @@ namespace Cysharp.Threading.Tasks
             }
         }
     }
+}

src/UniTask/Assets/Tests/AsyncReactivePropertyTest.cs

@@ -1,63 +0,0 @@
-using Cysharp.Threading.Tasks;
-using FluentAssertions;
-using System;
-using System.Collections;
-using System.Threading;
-using UnityEngine.TestTools;
-
-namespace Cysharp.Threading.TasksTests
-{
-    public class AsyncReactivePropertyTest
-    {
-        private int _callCounter;
-        
-        [UnityTest]
-        public IEnumerator WaitCancelWait() => UniTask.ToCoroutine(async () =>
-        {
-            // Test case for https://github.com/Cysharp/UniTask/issues/444
-            
-            var property = new AsyncReactiveProperty<int>(0);
-            
-            var cts1 = new CancellationTokenSource();
-            var cts2 = new CancellationTokenSource();
-            WaitForProperty(property, cts1.Token);
-            WaitForProperty(property, cts2.Token);
-
-            _callCounter = 0;
-            property.Value = 1;
-            _callCounter.Should().Be(2);
-
-            cts2.Cancel();
-            cts2.Dispose();
-            cts1.Cancel();
-            cts1.Dispose();
-
-            var cts3 = new CancellationTokenSource();
-            WaitForProperty(property, cts3.Token);
-
-            _callCounter = 0;
-            property.Value = 2;
-            _callCounter.Should().Be(1);
-            
-            cts3.Cancel();
-            cts3.Dispose();
-            await UniTask.CompletedTask;
-        });
-
-        private async void WaitForProperty(AsyncReactiveProperty<int> property, CancellationToken token)
-        {
-            while (true)
-            {
-                try
-                {
-                    await property.WaitAsync(token);
-                    _callCounter++;
-                }
-                catch (OperationCanceledException)
-                {
-                    break;
-                }
-            }
-        }
-    }
-}

src/UniTask/Assets/Tests/AsyncReactivePropertyTest.cs.meta

@@ -1,3 +0,0 @@
-fileFormatVersion: 2
-guid: 27665955eefb4448969b8cc4dd204600
-timeCreated: 1676129650