FIX: The button is not clickable when using Windows touch simulation inputs (ISXB-483)

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -19,6 +19,7 @@ however, it has to be formatted properly to pass verification tests.
 - Fixed "MissingReferenceException" errors when closing an in-game dropdown field [ISXB-1081](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1081).
 - Fixed potential crash on Mac when using stale references to deleted InputDevice objects [ISXB-606](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-606).
 - Fixed conditional compilation for non-editor analytics on platforms not enabling analytics.
+- Fixed simulated touch input not working with PlayerInput component [ISXB-483](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-483).
 
 ### Changed
 - Renamed editor Resources directories to PackageResources to fix package validation warnings.

Packages/com.unity.inputsystem/InputSystem/Plugins/EnhancedTouch/TouchSimulation.cs

@@ -2,6 +2,7 @@
 using Unity.Collections.LowLevel.Unsafe;
 using UnityEngine.InputSystem.Controls;
 using UnityEngine.InputSystem.LowLevel;
+using UnityEngine.InputSystem.Users;
 using UnityEngine.InputSystem.Utilities;
 #if UNITY_EDITOR
 using UnityEditor;
@@ -129,9 +130,6 @@ private unsafe void OnEvent(InputEventPtr eventPtr, InputDevice device)
             if (eventType != StateEvent.Type && eventType != DeltaStateEvent.Type)
                 return;
 
-            ////TODO: this can be simplified if we use events instead of InputState.Change() but doing so requires work on buffering events while processing; also
-            ////       needs extra handling to not lag into the next frame
-
             ////REVIEW: should we have specialized paths for MouseState and PenState here? (probably can only use for StateEvents)
 
             Pointer pointer = m_Pointers[pointerIndex];
@@ -332,9 +330,17 @@ private unsafe void UpdateTouch(int touchIndex, int pointerIndex, TouchPhase pha
                 }
             }
 
-            if (touch.isPrimaryTouch)
-                InputState.Change(simulatedTouchscreen.primaryTouch, touch, eventPtr: eventPtr);
-            InputState.Change(simulatedTouchscreen.touches[touchIndex], touch, eventPtr: eventPtr);
+            //NOTE: Processing these events still happen in the current frame.
+            using (StateEvent.From(simulatedTouchscreen, out var touchscreenEventPtr))
+            {
+                if (touch.isPrimaryTouch)
+                {
+                    simulatedTouchscreen.primaryTouch.WriteValueIntoEvent(touch, touchscreenEventPtr);
+                    InputSystem.QueueEvent(touchscreenEventPtr);
+                }
+                simulatedTouchscreen.touches[touchIndex].WriteValueIntoEvent(touch, touchscreenEventPtr);
+                InputSystem.QueueEvent(touchscreenEventPtr);
+            }
 
             if (phase.IsEndedOrCanceled())
             {
@@ -356,6 +362,7 @@ private unsafe void UpdateTouch(int touchIndex, int pointerIndex, TouchPhase pha
         [NonSerialized] private Action<InputEventPtr, InputDevice> m_OnEvent;
 
         internal static TouchSimulation s_Instance;
+        private PlayerInput m_PlayerInput;
 
         #if UNITY_EDITOR
         static TouchSimulation()