FIX: PWA asset isn't properly restored after deleting Library folder (ISXB-853) (#1904)

* Load and assign PWA asset after asset library has finished rebuilding

Author: timkeo

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -16,6 +16,7 @@ however, it has to be formatted properly to pass verification tests.
 - NullReferenceException thrown when right-clicking an empty Action Map list in Input Actions Editor windows [ISXB-833](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-833).
 - Fixed an issue where `System.ObjectDisposedException` would be thrown when deleting the last ActionMap item in the Input Actions Asset editor.
 - Fixed DualSense Edge's vibration and light bar not working on Windows
+- Fixed Project-wide Actions asset failing to reload properly after deleting project's Library folder.
 
 ### Changed
 - For Unity 6.0 and above, when an `EventSystem` GameObject is created in the Editor it will have the

Packages/com.unity.inputsystem/InputSystem/Editor/ProjectWideActions/ProjectWideActionsAsset.cs

@@ -35,6 +35,15 @@ private static void OnPostprocessAllAssets(string[] importedAssets, string[] del
                         MoveInputManagerAssetActionsToProjectWideInputActionAsset();
                         migratedInputActionAssets = true;
                     }
+
+                    if (!Application.isPlaying)
+                    {
+                        // If the Library folder is deleted, InputSystem will fail to retrieve the assigned Project-wide Asset because this look-up occurs
+                        // during initialization while the Library is being rebuilt. So, afterwards perform another check and assign PWA asset if needed.
+                        var pwaAsset = ProjectWideActionsBuildProvider.actionsToIncludeInPlayerBuild;
+                        if (InputSystem.actions == null && pwaAsset != null)
+                            InputSystem.actions = pwaAsset;
+                    }
                 }
             }