Started grouping assetdatabase imports when stripping folders from prefabs

- Introduced the AssetImportGrouper class to make it easier to work with AssetDatabase.StartAssetEditing()
- Wrapped prefab folder-stripping methods into AssetImportGrouper
- Added AssetDatabase.Refresh at the end of RevertChanges to make the editor show changes instantly after exiting Play Mode.

Author: SolidAlloy

Editor/Prefab Handling/AssetImportGrouper.cs

@@ -0,0 +1,27 @@
+namespace UnityHierarchyFolders.Editor
+{
+    using System;
+    using UnityEditor;
+
+    internal class AssetImportGrouper : IDisposable
+    {
+        private static AssetImportGrouper _instance;
+
+        private AssetImportGrouper() { }
+
+        public static AssetImportGrouper Init()
+        {
+            AssetDatabase.StartAssetEditing();
+
+            if (_instance == null)
+                _instance = new AssetImportGrouper();
+
+            return _instance;
+        }
+
+        public void Dispose()
+        {
+            AssetDatabase.StopAssetEditing();
+        }
+    }
+}

Editor/Prefab Handling/AssetImportGrouper.cs.meta

@@ -11,21 +11,15 @@ public class LabelHandler : AssetPostprocessor
 
         private static void OnPostprocessAllAssets(string[] importedAssets, string[] _, string[] __, string[] ___)
         {
-            try
+            // Group imports into one to improve performance in case there are multiple prefabs that need a label change.
+            using (AssetImportGrouper.Init())
             {
-                // Group imports into one to improve performance in case there are multiple prefabs that need a label change.
-                AssetDatabase.StartAssetEditing();
-
                 foreach (string assetPath in importedAssets)
                 {
                     if (assetPath.EndsWith(".prefab"))
                         HandlePrefabLabels(assetPath);
                 }
             }
-            finally
-            {
-                AssetDatabase.StopAssetEditing();
-            }
         }
 
         private static void HandlePrefabLabels(string assetPath)

Editor/Prefab Handling/LabelHandler.cs

@@ -22,7 +22,12 @@ static PrefabFolderStripper()
         public void OnPreprocessBuild(BuildReport report)
         {
             if (StripSettings.StripFoldersFromPrefabsInBuild)
-                StripFoldersFromDependentPrefabs();
+            {
+                using (AssetImportGrouper.Init())
+                {
+                    StripFoldersFromDependentPrefabs();
+                }
+            }
         }
 
         public void OnPostprocessBuild(BuildReport report)
@@ -42,7 +47,10 @@ private static void HandlePrefabsOnPlayMode(PlayModeStateChange state)
             {
                 // Stripping folders from all prefabs in the project instead of only the ones referenced in the scenes
                 // because a prefab may be hot-swapped in Play Mode.
-                StripFoldersFromAllPrefabs();
+                using (AssetImportGrouper.Init())
+                {
+                    StripFoldersFromAllPrefabs();
+                }
             }
             else if (state == PlayModeStateChange.EnteredEditMode)
             {
@@ -124,6 +132,8 @@ private static void RevertChanges()
             {
                 File.WriteAllText(path, content);
             }
+
+            AssetDatabase.Refresh();
         }
 
         /// <summary>