Improves inventory refresh logic and fixes UI glitches

AetherBags/AddonLifecycles/InventoryLifecycles.cs

@@ -14,6 +14,14 @@ using ValueType = FFXIVClientStructs.FFXIV.Component.GUI.ValueType;
 
 namespace AetherBags.AddonLifecycles;
 
+public static unsafe class DragDropState
+{
+    /// <summary>
+    /// Returns true if the game's drag-drop manager is currently dragging.
+    /// </summary>
+    public static bool IsDragging => AtkStage.Instance()->DragDropManager.IsDragging;
+}
+
 public class InventoryLifecycles : IDisposable
 {
 
@@ -30,12 +38,12 @@ public class InventoryLifecycles : IDisposable
         Services.AddonLifecycle.RegisterListener(AddonEvent.PreFinalize, retainer, OnPreFinalize);
 
         // PreRefresh Handlers
-        Services.AddonLifecycle.RegisterListener(AddonEvent.PreRefresh, ["Inventory", "InventoryLarge", "InventoryExpansion"], InventoryPreRefreshHandler);
+        Services.AddonLifecycle.RegisterListener(AddonEvent.PreRefresh, bags, InventoryPreRefreshHandler);
 
         // PostRequestedUpdate
         Services.AddonLifecycle.RegisterListener(AddonEvent.PostRequestedUpdate, "Inventory", OnInventoryUpdate);
         Services.AddonLifecycle.RegisterListener(AddonEvent.PostRequestedUpdate, "InventoryBuddy", OnSaddleBagUpdate);
-        Services.AddonLifecycle.RegisterListener(AddonEvent.PostRequestedUpdate, ["InventoryRetainer", "InventoryRetainerLarge"], OnRetainerInventoryUpdate);
+        Services.AddonLifecycle.RegisterListener(AddonEvent.PostRequestedUpdate, retainer, OnRetainerInventoryUpdate);
 
         // PreShow
         Services.AddonLifecycle.RegisterListener(AddonEvent.PreOpen, "InventoryBuddy", OnSaddleBagOpen);
@@ -181,6 +189,10 @@ public class InventoryLifecycles : IDisposable
         if (IsInUnsafeState())
             return;
 
+        if (DragDropState.IsDragging)
+            return;
+
+        System.LootedItemsTracker.FlushPendingChanges();
         System.AddonInventoryWindow?.RefreshFromLifecycle();
     }
 
@@ -189,6 +201,9 @@ public class InventoryLifecycles : IDisposable
         if (IsInUnsafeState())
             return;
 
+        if (DragDropState.IsDragging)
+            return;
+
         System.AddonSaddleBagWindow?.RefreshFromLifecycle();
     }
 
@@ -197,6 +212,9 @@ public class InventoryLifecycles : IDisposable
         if (IsInUnsafeState())
             return;
 
+        if (DragDropState.IsDragging)
+            return;
+
         System.AddonRetainerWindow?.RefreshFromLifecycle();
     }
 

AetherBags/Addons/AddonInventoryWindow.cs

@@ -101,12 +101,7 @@ public unsafe class AddonInventoryWindow : InventoryAddonBase
     private void OnLootedItemsChanged(IReadOnlyList<LootedItemInfo> lootedItems)
     {
         if (!IsOpen || !IsSetupComplete) return;
-
+        UpdateLootedCategory(lootedItems);
-        Services.Framework.RunOnTick(() =>
-        {
-            if (!IsOpen) return;
-            UpdateLootedCategory(lootedItems);
-        }, delayTicks: 1);
     }
 
     private void UpdateLootedCategory(IReadOnlyList<LootedItemInfo> lootedItems)
@@ -119,6 +114,7 @@ public unsafe class AddonInventoryWindow : InventoryAddonBase
             {
                 CategoriesNode.SetHoistedNode(_lootedCategoryNode);
             }
+            AutoSizeWindow();
         }
         else
         {
@@ -131,6 +127,7 @@ public unsafe class AddonInventoryWindow : InventoryAddonBase
 
                 CategoriesNode.RemoveNode(_lootedCategoryNode);
             }
+            AutoSizeWindow();
         }
     }
 
@@ -158,6 +155,7 @@ public unsafe class AddonInventoryWindow : InventoryAddonBase
         }, delayTicks: 3);
     }
 
+
     protected override void OnFinalize(AtkUnitBase* addon)
     {
         System.LootedItemsTracker.OnLootedItemsChanged -= OnLootedItemsChanged;

AetherBags/Addons/InventoryAddonBase.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Numerics;
+using AetherBags.AddonLifecycles;
 using AetherBags.Configuration;
 using AetherBags.Helpers;
 using AetherBags.Inventory;
@@ -169,11 +170,10 @@ public abstract unsafe class InventoryAddonBase : NativeAddon, IInventoryWindow
         CategoriesNode.SyncWithListDataByKey<CategorizedInventory, InventoryCategoryNode, uint>(
             dataList: categories,
             getKeyFromData: categorizedInventory => categorizedInventory.Key,
-            getKeyFromNode: node => node.Key,
+            getKeyFromNode: node => node.CategorizedInventory.Key,
             updateNode: (node, data) =>
             {
-                node.CategorizedInventory = data;
+                node.SetCategoryData(data, Math.Min(data.Items.Count, maxItemsPerLine));
-                node.ItemsPerLine = Math.Min(data.Items.Count, maxItemsPerLine);
                 node.RefreshNodeVisuals();
             },
             createNodeMethod: _ => CreateCategoryNode());
@@ -409,6 +409,9 @@ public abstract unsafe class InventoryAddonBase : NativeAddon, IInventoryWindow
     {
         base.OnRequestedUpdate(addon, numberArrayData, stringArrayData);
 
+        if (DragDropState.IsDragging)
+            return;
+
         InventoryState.RefreshFromGame();
         RefreshCategoriesCore(autosize: true);
     }

AetherBags/Inventory/LootedItemsTracker.cs

@@ -3,8 +3,11 @@ using System.Collections.Generic;
 using System.Linq;
 using AetherBags.Inventory.Items;
 using AetherBags.Inventory.Scanning;
+using Dalamud.Game.Inventory;
 using Dalamud.Game.Inventory.InventoryEventArgTypes;
+using Dalamud.Plugin.Services;
 using FFXIVClientStructs.FFXIV.Client.Game;
+using Lumina.Excel.Sheets;
 
 namespace AetherBags.Inventory;
 
@@ -12,20 +15,32 @@ public sealed unsafe class LootedItemsTracker : IDisposable
 {
     private static IReadOnlyList<InventoryType> StandardInventories => InventoryScanner.StandardInventories;
 
+    private const int BatchDelayMs = 300;
+
     private readonly List<LootedItemInfo> _lootedItems = new(capacity: 64);
+    private readonly Dictionary<(uint ItemId, bool IsHq), (InventoryItem Item, int Quantity)> _pendingChanges = new(capacity: 32);
+
     private bool _isEnabled;
+    private long _batchStartTick;
+    private bool _hasPendingRemoval;
 
     public event Action<IReadOnlyList<LootedItemInfo>>? OnLootedItemsChanged;
 
     public IReadOnlyList<LootedItemInfo> LootedItems => _lootedItems;
 
+    public bool HasPendingChanges => _pendingChanges.Count > 0 || _hasPendingRemoval;
+
     public void Enable()
     {
         if (_isEnabled) return;
 
         _isEnabled = true;
         _lootedItems.Clear();
+        _pendingChanges.Clear();
+        _batchStartTick = 0;
+        _hasPendingRemoval = false;
         Services.GameInventory.InventoryChangedRaw += OnInventoryChangedRaw;
+        Services.Framework.Update += OnFrameworkUpdate;
     }
 
     public void Disable()
@@ -34,13 +49,17 @@ public sealed unsafe class LootedItemsTracker : IDisposable
 
         _isEnabled = false;
         Services.GameInventory.InventoryChangedRaw -= OnInventoryChangedRaw;
+        Services.Framework.Update -= OnFrameworkUpdate;
         _lootedItems.Clear();
+        _pendingChanges.Clear();
+        _batchStartTick = 0;
+        _hasPendingRemoval = false;
     }
 
     public void Clear()
     {
         _lootedItems.Clear();
-        OnLootedItemsChanged?.Invoke(_lootedItems);
+        _hasPendingRemoval = true;
     }
 
     public void RemoveByIndex(int index)
@@ -50,12 +69,20 @@ public sealed unsafe class LootedItemsTracker : IDisposable
             if (_lootedItems[i].Index == index)
             {
                 _lootedItems.RemoveAt(i);
-                OnLootedItemsChanged?.Invoke(_lootedItems);
+                _hasPendingRemoval = true;
                 return;
             }
         }
     }
 
+    public void FlushPendingChanges()
+    {
+        if (_pendingChanges.Count == 0 && !_hasPendingRemoval) return;
+
+        _hasPendingRemoval = false;
+        OnLootedItemsChanged?.Invoke(_lootedItems);
+    }
+
     public void Dispose()
     {
         Disable();
@@ -66,13 +93,18 @@ public sealed unsafe class LootedItemsTracker : IDisposable
         if (!_isEnabled) return;
         if (!Services.ClientState.IsLoggedIn) return;
 
-        bool hasChanges = false;
+        bool anyAdded = false;
 
         foreach (var eventData in events)
         {
-            if (!StandardInventories.Contains((InventoryType)eventData.Item.ContainerType)) continue;
+            if (!StandardInventories.Contains((InventoryType)eventData.Item.ContainerType))
+                continue;
 
-            if (eventData is not (InventoryItemAddedArgs or InventoryItemChangedArgs)) continue;
+            if (eventData.Item.ContainerType == GameInventoryType.DamagedGear)
+                continue;
+
+            if (eventData is not (InventoryItemAddedArgs or InventoryItemChangedArgs))
+                continue;
 
             if (eventData is InventoryItemChangedArgs changedArgs &&
                 changedArgs.OldItemState.Quantity >= changedArgs.Item.Quantity)
@@ -80,22 +112,71 @@ public sealed unsafe class LootedItemsTracker : IDisposable
                 continue;
             }
 
-            var inventoryItem = (InventoryItem*)eventData.Item.Address;
+            if (ShouldFilterItem(eventData.Item.ItemId))
+                continue;
+
+            var inventoryItem = *(InventoryItem*)eventData.Item.Address;
             var changeAmount = eventData is InventoryItemChangedArgs changed
                 ? changed.Item.Quantity - changed.OldItemState.Quantity
                 : eventData.Item.Quantity;
 
-            _lootedItems.Add(new LootedItemInfo(
+            var key = (inventoryItem.ItemId, IsHq: inventoryItem.Flags.HasFlag(InventoryItem.ItemFlags.HighQuality));
-                _lootedItems.Count,
-                *inventoryItem,
-                changeAmount));
 
-            hasChanges = true;
+            if (_pendingChanges.TryGetValue(key, out var existing))
+            {
+                _pendingChanges[key] = (inventoryItem, existing.Quantity + changeAmount);
+            }
+            else
+            {
+                _pendingChanges[key] = (inventoryItem, changeAmount);
+            }
+
+            anyAdded = true;
         }
 
-        if (hasChanges)
+        if (anyAdded && _batchStartTick == 0)
         {
-            OnLootedItemsChanged?.Invoke(_lootedItems);
+            _batchStartTick = Environment.TickCount64;
         }
     }
+
+    private void OnFrameworkUpdate(IFramework framework)
+    {
+        if (_batchStartTick == 0)
+            return;
+
+        if (Environment.TickCount64 < _batchStartTick + BatchDelayMs)
+            return;
+
+        _batchStartTick = 0;
+
+        if (_pendingChanges.Count == 0)
+            return;
+
+        foreach (var ((itemId, isHq), (item, quantity)) in _pendingChanges)
+        {
+            if (quantity <= 0)
+                continue;
+
+            _lootedItems.Add(new LootedItemInfo(
+                _lootedItems.Count,
+                item,
+                quantity));
+        }
+
+        _pendingChanges.Clear();
+
+        OnLootedItemsChanged?.Invoke(_lootedItems);
+    }
+
+    private static bool ShouldFilterItem(uint itemId)
+    {
+        if (!Services.DataManager.GetExcelSheet<Item>().TryGetRow(itemId, out var item))
+            return false;
+
+        if (item.ItemUICategory.RowId == 62)
+            return true;
+
+        return false;
+    }
 }

AetherBags/Nodes/Inventory/InventoryCategoryNode.cs

@@ -1,5 +1,8 @@
 using System;
+using System.Collections.Generic;
 using System.Numerics;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 using AetherBags.Helpers;
 using AetherBags.Inventory;
 using AetherBags.Inventory.Categories;
@@ -33,6 +36,11 @@ public class InventoryCategoryNode : InventoryCategoryNodeBase
     private float _baseHeaderWidth = 96f;
     private string _fullHeaderText = string.Empty;
 
+    private uint _lastCategoryKey;
+    private int _lastItemCount;
+    private ulong _lastItemsHash;
+    private int _lastItemsPerLine;
+
     public event Action<InventoryCategoryNode, bool>? HeaderHoverChanged;
     public Action? OnRefreshRequested { get; set; }
     public Action? OnDragEnd { get; set; }
@@ -68,26 +76,68 @@ public class InventoryCategoryNode : InventoryCategoryNodeBase
         _itemGridNode.AttachNode(this);
     }
 
+    private CategorizedInventory _categorizedInventory;
+
     public CategorizedInventory CategorizedInventory
     {
-        get;
+        get => _categorizedInventory;
-        set
+        set => SetCategoryData(value, _itemGridNode.ItemsPerLine);
+    }
+
+    public void SetCategoryData(CategorizedInventory data, int itemsPerLine)
+    {
+        bool categoryChanged = data.Key != _lastCategoryKey;
+        bool itemsPerLineChanged = itemsPerLine != _lastItemsPerLine;
+
+        ulong itemsHash = ComputeItemsHash(CollectionsMarshal.AsSpan(data.Items));
+        bool itemsChanged = data.Items.Count != _lastItemCount || itemsHash != _lastItemsHash;
+
+        _lastCategoryKey = data.Key;
+        _lastItemCount = data.Items.Count;
+        _lastItemsHash = itemsHash;
+        _lastItemsPerLine = itemsPerLine;
+
+        _categorizedInventory = data;
+
+        _fullHeaderText = System.Config.General.ShowCategoryItemCount
+            ? $"{data.Category.Name} ({data.Items.Count})"
+            : data.Category.Name;
+
+        _categoryNameTextNode.String = _fullHeaderText;
+        _categoryNameTextNode.TextColor = data.Category.Color;
+        _categoryNameTextNode.TextTooltip = data.Category.Description;
+
+        if (itemsChanged || categoryChanged)
         {
-            field = value;
+            using (_itemGridNode.DeferRecalculateLayout())
+            {
+                _itemGridNode.ItemsPerLine = itemsPerLine;
+                UpdateItemGrid();
+            }
+        }
+        else if (itemsPerLineChanged)
+        {
+            _itemGridNode.ItemsPerLine = itemsPerLine;
+        }
 
-            _fullHeaderText = System.Config.General.ShowCategoryItemCount
+        if (categoryChanged || itemsChanged || itemsPerLineChanged)
-                ? $"{value.Category.Name} ({value.Items.Count})"
+        {
-                : value.Category.Name;
-
-            _categoryNameTextNode.String = _fullHeaderText;
-            _categoryNameTextNode.TextColor = value.Category.Color;
-            _categoryNameTextNode.TextTooltip = value.Category.Description;
-
-            UpdateItemGrid();
             RecalculateSize();
         }
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private static ulong ComputeItemsHash(ReadOnlySpan<ItemInfo> items)
+    {
+        ulong hash = 14695981039346656037UL;  // FNV-1a offset basis
+        foreach (var item in items)
+        {
+            hash ^= item.Key;
+            hash *= 1099511628211UL; // FNV-1a prime
+        }
+        return hash;
+    }
+
     public int ItemsPerLine
     {
         get => _itemGridNode.ItemsPerLine;
@@ -212,10 +262,43 @@ public class InventoryCategoryNode : InventoryCategoryNodeBase
 
     private void UpdateItemGrid()
     {
-        _itemGridNode.SyncWithListData(
+        _itemGridNode.SyncWithListDataByKey<ItemInfo, InventoryDragDropNode, ulong>(
-            CategorizedInventory.Items,
+            dataList: CategorizedInventory.Items,
-            node => node.ItemInfo,
+            getKeyFromData: item => item.Key,
-            CreateInventoryDragDropNode);
+            getKeyFromNode: node => node.ItemInfo?.Key ?? 0,
+            updateNode: UpdateInventoryDragDropNode,
+            createNodeMethod: CreateInventoryDragDropNode);
+    }
+
+    private void UpdateInventoryDragDropNode(InventoryDragDropNode node, ItemInfo data)
+    {
+        if (node.ItemInfo?.Key == data.Key)
+        {
+            node.ItemInfo = data;
+            node.Alpha = data.VisualAlpha;
+            node.AddColor = data.HighlightOverlayColor;
+            node.IsDraggable = !data.IsSlotBlocked;
+            return;
+        }
+
+        InventoryItem item = data.Item;
+        InventoryMappedLocation visualLocation = data.VisualLocation;
+
+        var visualInvType = InventoryType.GetInventoryTypeFromContainerId(visualLocation.Container);
+        int absoluteIndex = visualInvType.GetInventoryStartIndex + visualLocation.Slot;
+
+        node.ItemInfo = data;
+        node.IconId = item.IconId;
+        node.Alpha = data.VisualAlpha;
+        node.AddColor = data.HighlightOverlayColor;
+        node.IsDraggable = !data.IsSlotBlocked;
+        node.Payload = new DragDropPayload
+        {
+            Type = DragDropType.Item,
+            Int1 = visualLocation.Container,
+            Int2 = visualLocation.Slot,
+            ReferenceIndex = (short)absoluteIndex
+        };
     }
 
     private unsafe InventoryDragDropNode CreateInventoryDragDropNode(ItemInfo data)
@@ -268,16 +351,31 @@ public class InventoryCategoryNode : InventoryCategoryNodeBase
 
     public void RefreshNodeVisuals()
     {
-        foreach (var node in _itemGridNode.Nodes)
+        var nodes = _itemGridNode.Nodes;
+        for (int i = 0; i < nodes.Count; i++)
         {
-            if (node is not InventoryDragDropNode itemNode || itemNode.ItemInfo == null) continue;
+            if (nodes[i] is not InventoryDragDropNode itemNode || itemNode.ItemInfo == null)
+                continue;
 
-            itemNode.Alpha = itemNode.ItemInfo.VisualAlpha;
+            var info = itemNode.ItemInfo;
-            itemNode.AddColor = itemNode.ItemInfo.HighlightOverlayColor;
+            float newAlpha = info.VisualAlpha;
-            itemNode.IsDraggable = !itemNode.ItemInfo.IsSlotBlocked;
+            Vector3 newColor = info.HighlightOverlayColor;
+            bool newDraggable = !info.IsSlotBlocked;
+
+            if (!NearlyEqual(itemNode.Alpha, newAlpha))
+                itemNode.Alpha = newAlpha;
+
+            if (itemNode.AddColor != newColor)
+                itemNode.AddColor = newColor;
+
+            if (itemNode.IsDraggable != newDraggable)
+                itemNode.IsDraggable = newDraggable;
         }
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private static bool NearlyEqual(float a, float b) => MathF.Abs(a - b) < 0.001f;
+
     private unsafe void OnDiscard(DragDropNode node, ItemInfo item)
     {
         uint addonId = RaptureAtkUnitManager.Instance()->GetAddonByNode(node)->Id;

AetherBags/Nodes/Inventory/LootedItemDisplayNode.cs

@@ -1,7 +1,7 @@
 using System;
-using System.Numerics;
 using AetherBags.Inventory.Items;
 using FFXIVClientStructs.FFXIV.Client.UI;
+using FFXIVClientStructs.FFXIV.Common.Math;
 using FFXIVClientStructs.FFXIV.Component.GUI;
 using KamiToolKit.Classes;
 using KamiToolKit.Nodes;
@@ -11,11 +11,10 @@ namespace AetherBags.Nodes.Inventory;
 /// <summary>
 /// A display-only item node for looted items. Not draggable, but shows tooltip and can be dismissed.
 /// </summary>
-public unsafe class LootedItemDisplayNode : SimpleComponentNode
+public sealed unsafe class LootedItemDisplayNode : SimpleComponentNode
 {
     private readonly IconNode _iconNode;
     private readonly TextNode _quantityTextNode;
-    private readonly ResNode _collisionNode;
 
     public Action<LootedItemDisplayNode>? OnDismiss { get; set; }
 
@@ -27,54 +26,42 @@ public unsafe class LootedItemDisplayNode : SimpleComponentNode
         {
             Position = new Vector2(0, 0),
             Size = new Vector2(42, 46),
-            NodeFlags = NodeFlags.Visible | NodeFlags.Enabled,
         };
+        _iconNode.AddEvent(AtkEventType.MouseClick, OnMouseClick);
         _iconNode.AttachNode(this);
 
         _quantityTextNode = new TextNode
         {
             Size = new Vector2(40.0f, 12.0f),
             Position = new Vector2(4.0f, 34.0f),
-            NodeFlags = NodeFlags.Enabled | NodeFlags.EmitsEvents,
             Color = ColorHelper.GetColor(50),
             TextOutlineColor = ColorHelper.GetColor(51),
             TextFlags = TextFlags.Edge,
             AlignmentType = AlignmentType.Right,
         };
         _quantityTextNode.AttachNode(this);
+    }
 
-        _collisionNode = new ResNode
+    public LootedItemInfo LootedItem
+    {
+        get;
+        set
         {
-            Size = new Vector2(42, 46),
+            bool needsCollisionUpdate = field is null && value is not null;
-            NodeFlags = NodeFlags.Enabled | NodeFlags.EmitsEvents | NodeFlags.HasCollision,
+            field = value;
-        };
+            var item = value.Item;
-        _collisionNode.AddEvent(AtkEventType.MouseOver, OnMouseOver);
+            _iconNode.IconId = item.IconId;
-        _collisionNode.AddEvent(AtkEventType.MouseOut, OnMouseOut);
+            _iconNode.ItemTooltip = item.ItemId;
-        _collisionNode.AddEvent(AtkEventType.MouseClick, OnMouseClick);
+            _quantityTextNode.String = value.Quantity > 1 ? value.Quantity.ToString() : string.Empty;
-        _collisionNode.AttachNode(this);
-    }
 
-    public LootedItemInfo LootedItem { get; private set; } = null!;
+            if (needsCollisionUpdate)
-
+            {
-    public void SetLootedItem(LootedItemInfo lootedItem)
+                var addon = RaptureAtkUnitManager.Instance()->GetAddonByNode(this);
-    {
+                if (addon is not null)
-        LootedItem = lootedItem;
+                    addon->UpdateCollisionNodeList(false);
-        var item = lootedItem.Item;
+            }
-        _iconNode.IconId = item.IconId;
+        }
-        _quantityTextNode.String = lootedItem.Quantity > 1 ? lootedItem.Quantity.ToString() : string.Empty;
+    } = null!;
-    }
-
-    private void OnMouseOver(AtkEventListener* thisPtr, AtkEventType eventType, int eventParam, AtkEvent* atkEvent, AtkEventData* atkEventData)
-    {
-        var item = LootedItem.Item;
-        _collisionNode.ShowInventoryItemTooltip(item.Container, item.Slot);
-    }
-
-    private void OnMouseOut(AtkEventListener* thisPtr, AtkEventType eventType, int eventParam, AtkEvent* atkEvent, AtkEventData* atkEventData)
-    {
-        ushort addonId = RaptureAtkUnitManager.Instance()->GetAddonByNode(_collisionNode)->Id;
-        AtkStage.Instance()->TooltipManager.HideTooltip(addonId);
-    }
 
     private void OnMouseClick(AtkEventListener* thisPtr, AtkEventType eventType, int eventParam, AtkEvent* atkEvent, AtkEventData* atkEventData)
     {

AetherBags/Nodes/Inventory/LootedItemsCategoryNode.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Numerics;
+using System.Runtime.CompilerServices;
 using AetherBags.Inventory.Items;
 using AetherBags.Nodes.Layout;
 using FFXIVClientStructs.FFXIV.Component.GUI;
@@ -27,6 +28,9 @@ public class LootedItemsCategoryNode : InventoryCategoryNodeBase
 
     private IReadOnlyList<LootedItemInfo> _lootedItems = Array.Empty<LootedItemInfo>();
 
+    private int _lastItemCount;
+    private long _lastItemsHash;
+
     private int _hoverRefs;
     private bool _headerExpanded;
     private float _baseHeaderWidth = 96f;
@@ -95,10 +99,40 @@ public class LootedItemsCategoryNode : InventoryCategoryNodeBase
 
     public void UpdateLootedItems(IReadOnlyList<LootedItemInfo> lootedItems)
     {
+        long newHash = ComputeItemsHash(lootedItems);
+        bool itemsChanged = lootedItems.Count != _lastItemCount || newHash != _lastItemsHash;
+
+        _lastItemCount = lootedItems.Count;
+        _lastItemsHash = newHash;
         _lootedItems = lootedItems;
+
         UpdateHeaderText();
-        SyncItemGrid();
+
-        RecalculateSize();
+        if (itemsChanged)
+        {
+            using (_itemGridNode.DeferRecalculateLayout())
+            {
+                SyncItemGrid();
+            }
+            RecalculateSize();
+        }
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private static long ComputeItemsHash(IReadOnlyList<LootedItemInfo> items)
+    {
+        unchecked
+        {
+            long hash = unchecked((long)14695981039346656037UL);
+            for (int i = 0; i < items.Count; i++)
+            {
+                hash ^= items[i].Index;
+                hash *= 1099511628211L;
+                hash ^= items[i].Item.ItemId;
+                hash *= 1099511628211L;
+            }
+            return hash;
+        }
     }
 
     private void UpdateHeaderText()
@@ -163,20 +197,26 @@ public class LootedItemsCategoryNode : InventoryCategoryNodeBase
 
     private void SyncItemGrid()
     {
-        _itemGridNode.SyncWithListData(
+        _itemGridNode.SyncWithListDataByKey<LootedItemInfo, LootedItemDisplayNode, int>(
-            _lootedItems,
+            dataList: _lootedItems,
-            node => node.LootedItem,
+            getKeyFromData: item => item.Index,
-            CreateLootedItemNode);
+            getKeyFromNode: node => node.LootedItem?.Index ?? -1,
+            updateNode: UpdateLootedItemNode,
+            createNodeMethod: CreateLootedItemNode);
+    }
+
+    private static void UpdateLootedItemNode(LootedItemDisplayNode node, LootedItemInfo data)
+    {
+        node.LootedItem = data;
     }
 
     private LootedItemDisplayNode CreateLootedItemNode(LootedItemInfo lootedItem)
     {
-        var node = new LootedItemDisplayNode
+        return new LootedItemDisplayNode
         {
             OnDismiss = OnItemDismissed,
+            LootedItem = lootedItem,
         };
-        node.SetLootedItem(lootedItem);
-        return node;
     }
 
     private void OnItemDismissed(LootedItemDisplayNode node)

AetherBags/Nodes/Layout/DeferrableLayoutListNode.cs

@@ -0,0 +1,502 @@
+using System;
+using System.Collections.Generic;
+using System.Numerics;
+using System.Runtime.CompilerServices;
+using FFXIVClientStructs.FFXIV.Component.GUI;
+using KamiToolKit;
+using KamiToolKit.Nodes;
+
+namespace AetherBags.Nodes.Layout;
+
+public abstract class DeferrableLayoutListNode : SimpleComponentNode
+{
+    protected readonly List<NodeBase> NodeList = [];
+    private bool _suppressRecalculateLayout;
+    private int _deferRecalcDepth;
+    private bool _pendingRecalc;
+
+    /// <summary>
+    /// Hide and detach a node from the UI tree without disposing it.
+    /// Disposal happens later when KamiToolKit cleans up detached nodes.
+    /// </summary>
+    protected static void SafeDetachNode(NodeBase node)
+    {
+        try
+        {
+            node.IsVisible = false;
+            node.DetachNode();
+        }
+        catch (Exception ex)
+        {
+            Services.Logger.Error(ex, $"[SafeDetachNode] Error detaching {node.GetType().Name}");
+        }
+    }
+
+    public IEnumerable<T> GetNodes<T>() where T : NodeBase
+    {
+        for (int i = 0; i < NodeList.Count; i++)
+        {
+            if (NodeList[i] is T t)
+                yield return t;
+        }
+    }
+
+    public IReadOnlyList<NodeBase> Nodes => NodeList;
+
+    public bool ClipListContents
+    {
+        get => NodeFlags.HasFlag(NodeFlags.Clip);
+        set
+        {
+            if (value)
+                AddFlags(NodeFlags.Clip);
+            else
+                RemoveFlags(NodeFlags.Clip);
+        }
+    }
+
+    public float ItemSpacing { get; set; }
+
+    public float FirstItemSpacing { get; set; }
+
+    public void RecalculateLayout()
+    {
+        if (_suppressRecalculateLayout) return;
+
+        if (_deferRecalcDepth > 0)
+        {
+            _pendingRecalc = true;
+            return;
+        }
+
+        InternalRecalculateLayout();
+
+        for (int i = 0; i < NodeList.Count; i++)
+        {
+            if (NodeList[i] is DeferrableLayoutListNode subNode)
+                subNode.RecalculateLayout();
+        }
+    }
+
+    [Obsolete]
+    protected virtual void AdjustNode(NodeBase node) { }
+
+    protected abstract void InternalRecalculateLayout();
+
+    public ICollection<NodeBase> InitialNodes
+    {
+        init => AddNode(value);
+    }
+
+    public void AddNode(IEnumerable<NodeBase> nodes)
+    {
+        _suppressRecalculateLayout = true;
+        try
+        {
+            foreach (var node in nodes)
+            {
+                AddNode(node);
+            }
+        }
+        finally
+        {
+            _suppressRecalculateLayout = false;
+        }
+        RecalculateLayout();
+    }
+
+    public virtual void AddNode(NodeBase? node)
+    {
+        if (node is null) return;
+
+        NodeList.Add(node);
+
+        node.AttachNode(this);
+
+        RecalculateLayout();
+    }
+
+    public void RemoveNode(params NodeBase[] items)
+    {
+        _suppressRecalculateLayout = true;
+        try
+        {
+            foreach (var node in items)
+            {
+                RemoveNode(node);
+            }
+        }
+        finally
+        {
+            _suppressRecalculateLayout = false;
+        }
+        RecalculateLayout();
+    }
+
+    public virtual void RemoveNode(NodeBase node)
+    {
+        if (!NodeList.Contains(node)) return;
+
+        NodeList.Remove(node);
+        SafeDetachNode(node);
+
+        RecalculateLayout();
+    }
+
+    public void AddDummy(float size = 0.0f)
+    {
+        var dummyNode = new ResNode
+        {
+            Size = new Vector2(size, size),
+        };
+
+        AddNode(dummyNode);
+    }
+
+    public virtual void Clear()
+    {
+        _suppressRecalculateLayout = true;
+        try
+        {
+            for (int i = NodeList.Count - 1; i >= 0; i--)
+            {
+                var node = NodeList[i];
+                NodeList.RemoveAt(i);
+                SafeDetachNode(node);
+            }
+        }
+        finally
+        {
+            _suppressRecalculateLayout = false;
+        }
+        RecalculateLayout();
+    }
+
+    public delegate TU CreateNewNode<in T, out TU>(T data) where TU : NodeBase;
+
+    public delegate T GetDataFromNode<out T, in TU>(TU node) where TU : NodeBase;
+
+    private List<NodeBase>? _existingScratch;
+    private List<NodeBase>? _desiredScratch;
+    private List<NodeBase>? _toRemoveScratch;
+    private HashSet<object>? _dataKeysScratch;
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private List<NodeBase> RentExistingList(int capacity)
+    {
+        var list = _existingScratch ?? new List<NodeBase>(capacity);
+        list.Clear();
+        if (list.Capacity < capacity) list.Capacity = capacity;
+        _existingScratch = null;
+        return list;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void ReturnExistingList(List<NodeBase> list)
+    {
+        list.Clear();
+        _existingScratch = list;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private List<NodeBase> RentDesiredList(int capacity)
+    {
+        var list = _desiredScratch ?? new List<NodeBase>(capacity);
+        list.Clear();
+        if (list.Capacity < capacity) list.Capacity = capacity;
+        _desiredScratch = null;
+        return list;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void ReturnDesiredList(List<NodeBase> list)
+    {
+        list.Clear();
+        _desiredScratch = list;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private List<NodeBase> RentRemoveList(int capacity)
+    {
+        var list = _toRemoveScratch ?? new List<NodeBase>(capacity);
+        list.Clear();
+        if (list.Capacity < capacity) list.Capacity = capacity;
+        _toRemoveScratch = null;
+        return list;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void ReturnRemoveList(List<NodeBase> list)
+    {
+        list.Clear();
+        _toRemoveScratch = list;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private HashSet<object> RentKeySet(int capacity)
+    {
+        var set = _dataKeysScratch ?? new HashSet<object>(capacity);
+        set.Clear();
+        _dataKeysScratch = null;
+        return set;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void ReturnKeySet(HashSet<object> set)
+    {
+        set.Clear();
+        _dataKeysScratch = set;
+    }
+
+
+    public bool SyncWithListDataByKey<T, TU, TKey>(
+        IReadOnlyList<T> dataList,
+        Func<T, TKey> getKeyFromData,
+        Func<TU, TKey> getKeyFromNode,
+        Action<TU, T> updateNode,
+        CreateNewNode<T, TU> createNodeMethod,
+        IEqualityComparer<TKey>? keyComparer = null) where TU : NodeBase where TKey : notnull
+    {
+        keyComparer ??= EqualityComparer<TKey>.Default;
+
+        int dataCount = dataList.Count;
+
+        var desiredKeys = RentKeySet(dataCount);
+        for (int i = 0; i < dataCount; i++)
+        {
+            desiredKeys.Add(getKeyFromData(dataList[i])!);
+        }
+
+        var existing = RentExistingList(NodeList.Count);
+        var toRemove = RentRemoveList(16);
+
+        for (int i = 0; i < NodeList.Count; i++)
+        {
+            if (NodeList[i] is TU tu)
+            {
+                var key = getKeyFromNode(tu);
+                if (desiredKeys.Contains(key))
+                {
+                    existing.Add(tu);
+                }
+                else
+                {
+                    toRemove.Add(tu);
+                }
+            }
+        }
+
+        bool structureChanged = toRemove.Count > 0;
+
+        if (toRemove.Count > 0)
+        {
+            _suppressRecalculateLayout = true;
+            try
+            {
+                for (int i = 0; i < toRemove.Count; i++)
+                {
+                    var node = toRemove[i];
+                    NodeList.Remove(node);
+                    SafeDetachNode(node);
+                }
+            }
+            finally
+            {
+                _suppressRecalculateLayout = false;
+            }
+        }
+
+        Dictionary<TKey, TU>? byKey = null;
+        if (existing.Count > 0)
+        {
+            byKey = new Dictionary<TKey, TU>(existing.Count, keyComparer);
+            for (int i = 0; i < existing.Count; i++)
+            {
+                var tu = (TU)existing[i];
+                var key = getKeyFromNode(tu);
+                byKey.TryAdd(key, tu);
+            }
+        }
+
+        var desired = RentDesiredList(dataCount);
+
+        _suppressRecalculateLayout = true;
+        try
+        {
+            for (int i = 0; i < dataCount; i++)
+            {
+                var data = dataList[i];
+                var key = getKeyFromData(data);
+
+                if (byKey != null && byKey.TryGetValue(key, out var existingNode))
+                {
+                    updateNode(existingNode, data);
+                    desired.Add(existingNode);
+                    byKey.Remove(key);
+                }
+                else
+                {
+                    var newNode = createNodeMethod(data);
+                    NodeList.Add(newNode);
+                    newNode.AttachNode(this);
+                    updateNode(newNode, data);
+                    desired.Add(newNode);
+                    structureChanged = true;
+                }
+            }
+        }
+        finally
+        {
+            _suppressRecalculateLayout = false;
+        }
+
+        bool orderChanged = false;
+        if (!structureChanged && desired.Count > 0)
+        {
+            int tuIndex = 0;
+            for (int i = 0; i < NodeList.Count && tuIndex < desired.Count; i++)
+            {
+                if (NodeList[i] is TU)
+                {
+                    if (!ReferenceEquals(NodeList[i], desired[tuIndex]))
+                    {
+                        orderChanged = true;
+                        break;
+                    }
+                    tuIndex++;
+                }
+            }
+            if (tuIndex != desired.Count)
+                orderChanged = true;
+        }
+
+        if (structureChanged || orderChanged)
+        {
+            int insertIndex = -1;
+            for (int i = 0; i < NodeList.Count; i++)
+            {
+                if (NodeList[i] is TU)
+                {
+                    insertIndex = i;
+                    break;
+                }
+            }
+
+            if (insertIndex < 0)
+                insertIndex = NodeList.Count;
+
+            for (int i = NodeList.Count - 1; i >= 0; i--)
+            {
+                if (NodeList[i] is TU)
+                    NodeList.RemoveAt(i);
+            }
+
+            if (insertIndex > NodeList.Count)
+                insertIndex = NodeList.Count;
+
+            NodeList.InsertRange(insertIndex, desired);
+        }
+
+        ReturnKeySet(desiredKeys);
+        ReturnExistingList(existing);
+        ReturnRemoveList(toRemove);
+        ReturnDesiredList(desired);
+
+        if (structureChanged || orderChanged)
+        {
+            RecalculateLayout();
+        }
+
+        return structureChanged || orderChanged;
+    }
+
+    public bool SyncWithListData<T, TU>(
+        IEnumerable<T> dataList,
+        GetDataFromNode<T?, TU> getDataFromNode,
+        CreateNewNode<T, TU> createNodeMethod) where TU : NodeBase
+    {
+        _suppressRecalculateLayout = true;
+        var anythingChanged = false;
+        try
+        {
+            var existing = RentExistingList(NodeList.Count);
+            for (int i = 0; i < NodeList.Count; i++)
+            {
+                if (NodeList[i] is TU tu)
+                    existing.Add(tu);
+            }
+
+            var dataSet = new HashSet<T>(EqualityComparer<T>.Default);
+            foreach (var d in dataList)
+                dataSet.Add(d);
+
+            var represented = new HashSet<T>(EqualityComparer<T>.Default);
+
+            for (int i = 0; i < existing.Count; i++)
+            {
+                var tu = (TU)existing[i];
+                var nodeData = getDataFromNode(tu);
+
+                if (nodeData is null || !dataSet.Contains(nodeData))
+                {
+                    NodeList.Remove(tu);
+                    SafeDetachNode(tu);
+                    anythingChanged = true;
+                    continue;
+                }
+
+                represented.Add(nodeData);
+            }
+
+            foreach (var data in dataSet)
+            {
+                if (represented.Contains(data))
+                    continue;
+
+                var newNode = createNodeMethod(data);
+                NodeList.Add(newNode);
+                newNode.AttachNode(this);
+                anythingChanged = true;
+            }
+
+            ReturnExistingList(existing);
+        }
+        finally
+        {
+            _suppressRecalculateLayout = false;
+        }
+
+        if (anythingChanged)
+            RecalculateLayout();
+
+        return anythingChanged;
+    }
+
+    public void ReorderNodes(Comparison<NodeBase> comparison)
+    {
+        NodeList.Sort(comparison);
+        RecalculateLayout();
+    }
+
+    public IDisposable DeferRecalculateLayout()
+    {
+        _deferRecalcDepth++;
+        return new RecalcDeferToken(this);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void EndDefer()
+    {
+        _deferRecalcDepth--;
+        if (_deferRecalcDepth == 0 && _pendingRecalc)
+        {
+            _pendingRecalc = false;
+            RecalculateLayout();
+        }
+    }
+
+    private readonly struct RecalcDeferToken(DeferrableLayoutListNode owner) : IDisposable
+    {
+        public void Dispose() => owner.EndDefer();
+    }
+}

AetherBags/Nodes/Layout/HybridDirectionalFlexNode.cs

@@ -1,11 +1,10 @@
 using KamiToolKit;
-using KamiToolKit.Nodes;
 
 namespace AetherBags.Nodes.Layout;
 
 public class HybridDirectionalFlexNode : HybridDirectionalFlexNode<NodeBase> { }
 
-public class HybridDirectionalFlexNode<T> : LayoutListNode where T : NodeBase
+public class HybridDirectionalFlexNode<T> : DeferrableLayoutListNode where T : NodeBase
 {
     public FlexGrowDirection GrowDirection
     {

AetherBags/Nodes/Layout/HybridDirectionalStackNode.cs

@@ -1,9 +1,8 @@
 using KamiToolKit;
-using KamiToolKit.Nodes;
 
 namespace AetherBags.Nodes.Layout;
 
-public class HybridDirectionalStackNode<T> : LayoutListNode where T : NodeBase
+public class HybridDirectionalStackNode<T> : DeferrableLayoutListNode where T : NodeBase
 {
     public FlexGrowDirection GrowDirection
     {

AetherBags/Nodes/Layout/WrappingGridNode.cs

@@ -1,5 +1,4 @@
 using KamiToolKit;
-using KamiToolKit.Nodes;
 using System;
 using System.Collections;
 using System.Collections.Generic;
@@ -7,7 +6,7 @@ using System.Runtime.CompilerServices;
 
 namespace AetherBags.Nodes.Layout;
 
-public sealed class WrappingGridNode<T> : LayoutListNode where T : NodeBase
+public sealed class WrappingGridNode<T> : DeferrableLayoutListNode where T : NodeBase
 {
     public float HorizontalSpacing { get; set; } = 10f;
     public float VerticalSpacing { get; set; } = 10f;
@@ -36,9 +35,6 @@ public sealed class WrappingGridNode<T> : LayoutListNode where T : NodeBase
     private bool _lastuseStableInsert;
     private int _lastCompactLookahead;
 
-    private int _deferRecalcDepth;
-    private bool _pendingRecalc;
-
     private int[] _orderScratch = Array.Empty<int>();
 
     private T? _hoistedNode;
@@ -80,7 +76,7 @@ public sealed class WrappingGridNode<T> : LayoutListNode where T : NodeBase
     {
         if (_pinned.Add(node))
         {
-            RequestRecalculateLayout();
+            RecalculateLayout();
             return true;
         }
         return false;
@@ -90,7 +86,7 @@ public sealed class WrappingGridNode<T> : LayoutListNode where T : NodeBase
     {
         if (_pinned.Remove(node))
         {
-            RequestRecalculateLayout();
+            RecalculateLayout();
             return true;
         }
         return false;
@@ -100,7 +96,7 @@ public sealed class WrappingGridNode<T> : LayoutListNode where T : NodeBase
     {
         if (_pinned.Count == 0) return;
         _pinned.Clear();
-        RequestRecalculateLayout();
+        RecalculateLayout();
     }
 
     public bool IsPinned(T node) => _pinned.Contains(node);
@@ -1013,34 +1009,6 @@ public sealed class WrappingGridNode<T> : LayoutListNode where T : NodeBase
         _orderScratch = new int[newSize];
     }
 
-    public IDisposable DeferRecalculateLayout()
-    {
-        _deferRecalcDepth++;
-        return new RecalcDeferToken<T>(this);
-    }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    private void RequestRecalculateLayout()
-    {
-        if (_deferRecalcDepth > 0)
-        {
-            _pendingRecalc = true;
-            return;
-        }
-
-        RecalculateLayout();
-    }
-
-    private void EndDefer()
-    {
-        _deferRecalcDepth--;
-        if (_deferRecalcDepth == 0 && _pendingRecalc)
-        {
-            _pendingRecalc = false;
-            RecalculateLayout();
-        }
-    }
-
     private sealed class RowsReadOnlyView : IReadOnlyList<IReadOnlyList<NodeBase>>
     {
         private readonly List<List<NodeBase>> _rows;
@@ -1068,11 +1036,4 @@ public sealed class WrappingGridNode<T> : LayoutListNode where T : NodeBase
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public int GetHashCode(TRef obj) => RuntimeHelpers.GetHashCode(obj);
     }
-
-
-    private readonly struct RecalcDeferToken<TRef>(WrappingGridNode<TRef> owner) : IDisposable
-        where TRef : NodeBase
-    {
-        public void Dispose() => owner.EndDefer();
-    }
 }