fix: Fixes dupe property copying. Adds IgnoreDupe (#1811)

## Summary

### Changes
- Adds `[IgnoreDupe]` and `[SerializedIgnoreDupe]`
- Updates all _known_ classes that need the attribute. Some might be missing, please helps us find them!
- Adds `Item.Dupe()` command and encapsulates `CopyProperties` and `OnAfterDuped`. This is also overridable.
- Updates Dupe command to use the new logic.
- Fixes duping multiple kinds of objects that used to be outright broken.

### Bug Fixes
- Fixes issue with durability after duping
- Fixes issue with hue after duping

> [!Note]
> **Developer Note**
> Customizing how duping an item works now requires two steps:
> 1. Add `[IgnoreDupe]` or `[SerializedIgnoreDupe]` to the property/field
> 2. Add custom logic in an `OnAfterDuped` override
>
> When do you need to do this?
> *When the property being copied is not a primitive, and you need to manually deep-clone the contents of the property such as with Lists, Dictionaries, or sub classes.*

Projects/Server/Attributes.cs

@@ -21,19 +21,13 @@ using ModernUO.Serialization;
 namespace Server;
 
 [AttributeUsage(AttributeTargets.Property)]
-public class HueAttribute : Attribute
-{
-}
+public class HueAttribute : Attribute;
 
 [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct)]
-public class PropertyObjectAttribute : Attribute
-{
-}
+public class PropertyObjectAttribute : Attribute;
 
 [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct)]
-public class NoSortAttribute : Attribute
-{
-}
+public class NoSortAttribute : Attribute;
 
 [AttributeUsage(AttributeTargets.Method)]
 public class CallPriorityAttribute : Attribute
@@ -193,3 +187,9 @@ public class SerializedCommandPropertyAttribute : SerializedPropertyAttrAttribut
     public bool ReadOnly { get; }
     public bool CanModify { get; }
 }
+
+[AttributeUsage(AttributeTargets.Property)]
+public class IgnoreDupeAttribute : Attribute;
+
+[AttributeUsage(AttributeTargets.Field)]
+public class SerializedIgnoreDupeAttribute : SerializedPropertyAttrAttribute<IgnoreDupeAttribute>;

Projects/Server/Guild.cs

@@ -44,14 +44,18 @@ public abstract class BaseGuild : ISerializable
 
     public bool Deleted => Disbanded;
 
+    [IgnoreDupe]
     [CommandProperty(AccessLevel.Counselor)]
     public Serial Serial { get; }
 
+    [IgnoreDupe]
     [CommandProperty(AccessLevel.GameMaster, readOnly: true)]
     public DateTime Created { get; set; } = Core.Now;
 
+    [IgnoreDupe]
     public long SavePosition { get; set; } = -1;
 
+    [IgnoreDupe]
     public BufferWriter SaveBuffer { get; set; }
 
     public abstract void Serialize(IGenericWriter writer);

Projects/Server/Items/Item.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using Server.Collections;
 using Server.ContextMenus;
@@ -254,8 +255,13 @@ public class Item : IHued, IComparable<Item>, ISpawnable, IObjectPropertyListEnt
     }
 
     // Sectors
+    [IgnoreDupe]
     public Item Next { get; set; }
+
+    [IgnoreDupe]
     public Item Previous { get; set; }
+
+    [IgnoreDupe]
     public bool OnLinkList { get; set; }
 
     /// <summary>
@@ -586,6 +592,7 @@ public class Item : IHued, IComparable<Item>, ISpawnable, IObjectPropertyListEnt
     }
 
     // Note: Setting the parent via command/props causes problems.
+    [IgnoreDupe]
     [CommandProperty(AccessLevel.GameMaster, readOnly: true)]
     public IEntity Parent
     {
@@ -754,6 +761,7 @@ public class Item : IHued, IComparable<Item>, ISpawnable, IObjectPropertyListEnt
     public int CompareTo(Item other) => other == null ? -1 : Serial.CompareTo(other.Serial);
 
     public virtual int HuedItemID => m_ItemID;
+
     public ObjectPropertyList PropertyList => m_PropertyList ??= InitializePropertyList(new ObjectPropertyList(this));
 
     /// <summary>
@@ -768,13 +776,17 @@ public class Item : IHued, IComparable<Item>, ISpawnable, IObjectPropertyListEnt
         AddNameProperties(list);
     }
 
+    [IgnoreDupe]
     [CommandProperty(AccessLevel.GameMaster, readOnly: true)]
     public DateTime Created { get; set; } = Core.Now;
 
+    [IgnoreDupe]
     public long SavePosition { get; set; } = -1;
 
+    [IgnoreDupe]
     public BufferWriter SaveBuffer { get; set; }
 
+    [IgnoreDupe]
     [CommandProperty(AccessLevel.Counselor)]
     public Serial Serial { get; }
 
@@ -1445,6 +1457,7 @@ public class Item : IHued, IComparable<Item>, ISpawnable, IObjectPropertyListEnt
         ClearProperties();
     }
 
+    [IgnoreDupe]
     public ISpawner Spawner
     {
         get => LookupCompactInfo()?.m_Spawner;
@@ -3341,21 +3354,41 @@ public class Item : IHued, IComparable<Item>, ISpawnable, IObjectPropertyListEnt
         }
     }
 
-    private static readonly HashSet<string> _excludedProperties =
-    [
-        "SaveBuffer",
-        "Parent",
-        "Next",
-        "Previous",
-        "OnLinkList"
-    ];
-
-    public virtual bool DupeExcludedProperty(string propertyName) => _excludedProperties.Contains(propertyName);
-
     public virtual void OnAfterDuped(Item newItem)
     {
     }
 
+    // Warning: This uses reflection and is slow!
+    public virtual void Dupe(Item newItem)
+    {
+        CopyProperties(this, newItem);
+        OnAfterDuped(newItem);
+    }
+
+    // Warning: This uses reflection and is slow!
+    public static void CopyProperties(Item src, Item dest)
+    {
+        var props = src.GetType().GetProperties();
+
+        for (var i = 0; i < props.Length; i++)
+        {
+            var p = props[i];
+            if (p.GetCustomAttribute(typeof(IgnoreDupeAttribute), true) != null || !p.CanRead || !p.CanWrite)
+            {
+                continue;
+            }
+
+            try
+            {
+                p.SetValue(dest, p.GetValue(src, null), null);
+            }
+            catch
+            {
+                // ignored
+            }
+        }
+    }
+
     public virtual bool OnDragLift(Mobile from) => true;
 
     public virtual bool OnEquip(Mobile from) => true;

Projects/Server/Mobiles/Mobile.cs

@@ -2256,13 +2256,17 @@ public partial class Mobile : IHued, IComparable<Mobile>, ISpawnable, IObjectPro
         AddNameProperties(list);
     }
 
+    [IgnoreDupe]
     [CommandProperty(AccessLevel.GameMaster, readOnly: true)]
     public DateTime Created { get; set; } = Core.Now;
 
+    [IgnoreDupe]
     public long SavePosition { get; set; } = -1;
 
+    [IgnoreDupe]
     public BufferWriter SaveBuffer { get; set; }
 
+    [IgnoreDupe]
     [CommandProperty(AccessLevel.Counselor)]
     public Serial Serial { get; }