CHANGE: Make Project-wide Actions the default for Player Input

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -20,6 +20,7 @@ however, it has to be formatted properly to pass verification tests.
 - Project-wide input actions template extension changed from .inputactions to .json. This avoids showing template actions in the action's selector UI that are not intended to be used.
 - Re-enabled some UI tests that were disabled on iOS.
 - Reorganized package Project Settings so that "Input System Package" setting node contains "Input Actions" and "Settings" becomes a child node when Project-wide Actions are available. For Unity versions where Project-wide Actions are not available, the settings structure remains unchanged.
+- Make Project-wide Actions the default actions for Player Input.
 
 ### Added
 - Support for [Game rotation vector](https://developer.android.com/reference/android/hardware/Sensor#TYPE_GAME_ROTATION_VECTOR) sensor on Android

Packages/com.unity.inputsystem/InputSystem/Plugins/PlayerInput/PlayerInput.cs

@@ -5,6 +5,10 @@
 using UnityEngine.InputSystem.Users;
 using UnityEngine.InputSystem.Utilities;
 
+#if UNITY_EDITOR
+using UnityEngine.InputSystem.Editor;
+#endif
+
 #if PACKAGE_DOCS_GENERATION || UNITY_INPUT_SYSTEM_ENABLE_UI
 using UnityEngine.InputSystem.UI;
 #endif
@@ -1607,6 +1611,15 @@ private void AssignPlayerIndex()
             }
         }
 
+        #if UNITY_EDITOR && UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
+        void Reset()
+        {
+            // Set default actions to project wide actions.
+            m_Actions = ProjectWideActionsAsset.GetOrCreate();
+        }
+
+        #endif
+
         private void OnEnable()
         {
             m_Enabled = true;

Packages/com.unity.inputsystem/InputSystem/Plugins/PlayerInput/PlayerInputEditor.cs

@@ -74,7 +74,7 @@ public override void OnInspectorGUI()
             EditorGUI.BeginChangeCheck();
             EditorGUILayout.PropertyField(m_ActionsProperty);
             var actionsWereChanged = false;
-            if (EditorGUI.EndChangeCheck() || !m_ActionAssetInitialized)
+            if (EditorGUI.EndChangeCheck() || !m_ActionAssetInitialized || CheckIfActionAssetChanged())
             {
                 OnActionAssetChange();
                 actionsWereChanged = true;
@@ -230,6 +230,22 @@ public override void OnInspectorGUI()
                 DoDebugUI();
         }
 
+        // This checks changes that are not captured by BeginChangeCheck/EndChangeCheck.
+        // One such case is when the user triggers a "Reset" on the component.
+        bool CheckIfActionAssetChanged()
+        {
+            if (m_ActionsProperty.objectReferenceValue != null)
+            {
+                var assetInstanceID = m_ActionsProperty.objectReferenceValue.GetInstanceID();
+                bool result = assetInstanceID != m_ActionAssetInstanceID;
+                m_ActionAssetInstanceID = (int)assetInstanceID;
+                return result;
+            }
+
+            m_ActionAssetInstanceID = -1;
+            return false;
+        }
+
         private void DoHelpCreateAssetUI()
         {
             if (m_ActionsProperty.objectReferenceValue != null)
@@ -566,6 +582,7 @@ void AddEntry(InputAction action, PlayerInput.ActionEvent actionEvent)
 
         [NonSerialized] private bool m_NotificationBehaviorInitialized;
         [NonSerialized] private bool m_ActionAssetInitialized;
+        [NonSerialized] private int m_ActionAssetInstanceID;
     }
 }
 #endif // UNITY_EDITOR