Fix duplicated Validation operations during Toolbox initialization

Author: arimger

Assets/Editor Toolbox/Editor/ToolboxEditorSettings.cs

@@ -117,6 +117,7 @@ internal class ToolboxEditorSettings : ScriptableObject, IToolboxGeneralSettings
         private bool projectSettingsDirty;
         private bool inspectorSettingsDirty;
         private bool sceneViewSettingsDirty;
+        private int lastValidationFrame;
 
         internal event Action<IToolboxHierarchySettings> OnHierarchySettingsChanged;
         internal event Action<IToolboxProjectSettings> OnProjectSettingsChanged;
@@ -179,13 +180,25 @@ internal void ValidateSceneViewSettings()
 
         internal void Validate()
         {
+            Validate(false);
+        }
+
+        internal void Validate(bool force)
+        {
+            //NOTE: additional check to prevent multiple validations in the same frame, e.g. typical case:
+            // - after recompilation we are initializing toolbox and we want to validate settings, in the same time Unity validates all SOs
+            if (lastValidationFrame == Time.frameCount && !force)
+            {
+                return;
+            }
+
             ValidateHierarchySettings();
             ValidateProjectSettings();
             ValidateInspectorSettings();
             ValidateSceneViewSettings();
+            lastValidationFrame = Time.frameCount;
         }
 
-
         /// <summary>
         /// Called internally by the Editor after any value change or the Undo/Redo operation.
         /// </summary>
@@ -334,7 +347,6 @@ public void ResetIconRectProperties()
                 Defaults.smallFolderIconYPaddingDefault);
         }
 
-
         public bool UseToolboxHierarchy
         {
             get => useToolboxHierarchy;

Assets/Editor Toolbox/Editor/ToolboxManager.cs

@@ -152,13 +152,15 @@ internal static bool TryInitializeSettings(string settingsGuid)
             //try to get proper settings asset from the provided guid
             if (Settings = AssetDatabase.LoadAssetAtPath<ToolboxEditorSettings>(SettingsPath))
             {
+                //TODO: instead of relying on validation events let's prepare appropriate initialize/deinitialize process for all sub-systems
+
                 //subscribe to all related events
                 Settings.OnHierarchySettingsChanged += ManageHierarchyCore;
                 Settings.OnProjectSettingsChanged += ManageProjectCore;
                 Settings.OnInspectorSettingsChanged += ManageInspectorCore;
                 Settings.OnSceneViewSettingsChanged += ManageSceneViewCore;
                 //initialize core functionalities
-                Settings.Validate();
+                Settings.Validate(true);
                 return true;
             }
             else