Unity has a very annoying issue that duplicate object will put your new duplicates at bottom of hierarchy

So, here I found a code in this forum post to solve this issue, and I rewrite asset duplicate part and renew some legacy function This tool really saved my life especially I used to sort my hierarchy with different usage

<aside> 💡 See also [Tool] Color Hierarchy Highlighter to make better sorting of your hierarchy

</aside>

Source Code

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;

public static class EditorDuplicateCommand
{
    [MenuItem("Edit/Smart Duplicate %d", false, 0)]
    private static void DuplicateSelection()
    {
        var newSelection = new List<Object>();
        if (Selection.gameObjects.Length > 0)
        {
            for (int ui = 0; ui < Selection.gameObjects.Length; ui++)
            {
                var go = Selection.gameObjects[ui];
                int siblingIndex = go.transform.GetSiblingIndex();
                var newGo = SmartInstantiate(go);
                newGo.transform.parent = go.transform.parent;
                newGo.transform.position = go.transform.position;
                newGo.transform.SetSiblingIndex(siblingIndex + 1);
                newGo.name = go.name;
                newSelection.Add(newGo);
            }
        }
        else
        {
            for (int ui = 0; ui < Selection.objects.Length; ui++)
            {
                var go = Selection.objects[ui];
                var newGo = DuplicateAsset(go);
                newSelection.Add(newGo);
            }
        }
        Selection.objects = newSelection.ToArray();
    }

    private static GameObject SmartInstantiate(GameObject go)
    {
        if (PrefabUtility.GetPrefabInstanceStatus(go) == PrefabInstanceStatus.Connected)
        {
            var prefab = PrefabUtility.GetCorrespondingObjectFromSource(go) as GameObject;
            var newGo = (GameObject)PrefabUtility.InstantiatePrefab(prefab);
            var mods = PrefabUtility.GetPropertyModifications(go);
            PrefabUtility.SetPropertyModifications(newGo, mods);
            return newGo;
        }

        if (PrefabUtility.GetPrefabAssetType(go) != PrefabAssetType.NotAPrefab)
        {
            return DuplicateAsset(go) as GameObject;
        }

        return GameObject.Instantiate(go) as GameObject;
    }

    private static Object DuplicateAsset(Object targetAsset)
    {
        int index = 1;
        while (AssetDatabase.LoadAssetAtPath<Object>(AssetDatabase.GetAssetPath(targetAsset).Replace(".", " " + index + ".")) != null)
        {
            index++;
            if (index > 100)
            {
                Debug.LogError("Massive Asset Duplicate Detect");
            }
        }
        AssetDatabase.CopyAsset(AssetDatabase.GetAssetPath(targetAsset), AssetDatabase.GetAssetPath(targetAsset).Replace(".", " " + index + "."));
        return AssetDatabase.LoadAssetAtPath<Object>(AssetDatabase.GetAssetPath(targetAsset).Replace(".", " " + index + "."));
    }
}

How to use (Unity 2019.3)

1. Create this code

2. Press Ctrl+D and Unity will show this shortcut conflict window, chose Resolve Conflict

   

3. Shortcuts window will opened automatically (you can also find it in Edit→Shortcuts ) Remove one of them and move to other shortcut like Ctrl+Shift+D (I suggest keep native duplicate since current code still have few issue when duplicating non GameObject target)

   

4. Enjoy new duplicate experience!

   

<aside> 💡 If you want to change back default Duplicate, just go to Shortcuts Window and assign Duplicate function back

</aside>

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