Tri-Inspector/Editor.Extras/Drawers/IndentDrawer.cs

using TriInspector;
using TriInspector.Drawers;
using TriInspector.Utilities;
using UnityEngine;

[assembly: RegisterTriAttributeDrawer(typeof(IndentDrawer), TriDrawerOrder.Decorator)]

namespace TriInspector.Drawers
{
    public class IndentDrawer : TriAttributeDrawer<IndentAttribute>
    {
        public override void OnGUI(Rect position, TriProperty property, TriElement next)
        {
            using (TriGuiHelper.PushIndentLevel(Attribute.Indent))
            {
                next.OnGUI(position);
            }
        }
    }
}