Fixed many errors of first import for project + Handling reimport

Editor/Discover/DiscoverWindow.cs

             if (value != GetShowOnStartup(name)) EditorPrefs.SetBool($"{name}.ShowAtStartup", value);
         }
 
+        public static void Reload()
+        {
+            EditorApplication.update -= ShowAtStartup;
+            s_StartupDiscoverAssets = null;
+            InitShowAtStartup();
+        }
 
         [InitializeOnLoadMethod]
         static void InitShowAtStartup()

Editor/HierarchyHints/HierarchyHints.cs

         {
             EditorApplication.hierarchyWindowItemOnGUI -= HierarchyOnGUI;
             EditorApplication.hierarchyWindowItemOnGUI += HierarchyOnGUI;
-
-            foreach (var kvp in s_Definitions)
-            {
-                Contents.AddIcon(kvp.Key, kvp.Value);
-            }
         }
 
         static Dictionary<Type, string> s_Definitions = new Dictionary<Type, string>()
 
             public static GUIContent GetContent(Type t)
             {
+                if (!s_Icons.ContainsKey(t) && s_Definitions.ContainsKey(t))
+                    AddIcon(t,s_Definitions[t]);
+
                 return s_Icons[t];
             }
         }

Editor/WelcomeScreen/WelcomeScreen.Setup.cs

 
         }
 
-        const string kSettingsAssetPath = "Assets/Resources/GameplayIngredientsSettings.asset";
+        public const string kSettingsAssetPath = "Assets/Resources/GameplayIngredientsSettings.asset";
 
         static void SettingAssetPage()
         {

Editor/WelcomeScreen/WelcomeScreen.cs

             set { if (value != showOnStartup) EditorPrefs.SetBool(kShowOnStartupPreference, value); }
         }
 
-        static readonly Texture2D header = (Texture2D)EditorGUIUtility.Load("Packages/net.peeweek.gameplay-ingredients/Editor/WelcomeScreen/welcome-title.png");
+        static Texture2D header
+        {
+            get
+            {
+                if (s_Header == null)
+                    s_Header = (Texture2D)EditorGUIUtility.Load("Packages/net.peeweek.gameplay-ingredients/Editor/WelcomeScreen/welcome-title.png");
+
+                return s_Header;
+            }
+        }
+
+        static Texture2D s_Header;
+
+        public static void Reload()
+        {
+            EditorApplication.update -= ShowAtStartup;
+            InitShowAtStartup();
+        }
 
         [InitializeOnLoadMethod]
         static void InitShowAtStartup()
-
         }
 
         static void ShowAtStartup()

Editor/GameplayIngredientsAssetPostprocessor.cs

+using System.Linq;
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+
+namespace GameplayIngredients.Editor
+{
+    public class GameplayIngredientsAssetPostprocessor : AssetPostprocessor
+    {
+        static void OnPostprocessAllAssets(string[] importedAssets, string[] deletedAssets, string[] movedAssets, string[] movedFromAssetPaths)
+        {
+            if (importedAssets.Contains(WelcomeScreen.kSettingsAssetPath))
+            {
+                Debug.Log("Imported GameplayIngredientsSettings");
+                WelcomeScreen.Reload();
+            }
+
+            string[] allDiscovery = AssetDatabase.FindAssets("t:DiscoverAsset");
+            bool needDiscoveryReload = false;
+            foreach(var guid in allDiscovery)
+            {
+                string path = AssetDatabase.GUIDToAssetPath(guid);
+                if(importedAssets.Contains(path))
+                {
+                    needDiscoveryReload = true;
+                    break;
+                }
+            }
+            if (needDiscoveryReload)
+                DiscoverWindow.Reload();
+        }
+    }
+}

Editor/GameplayIngredientsAssetPostprocessor.cs.meta

+fileFormatVersion: 2
+guid: a13118b22a04c0d4d95bb500a88e59ab
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: