NestrerUnitWidget.cs

using System;
using System.Collections.Generic;

namespace Unity.VisualScripting
{
    public class NestrerUnitWidget<TNesterUnit> : UnitWidget<TNesterUnit>
        where TNesterUnit : class, INesterUnit
    {
        public NestrerUnitWidget(FlowCanvas canvas, TNesterUnit unit) : base(canvas, unit) { }

        protected override IEnumerable<DropdownOption> contextOptions
        {
            get
            {
                var childReference = reference.ChildReference(unit, false);

                if (childReference != null)
                {
                    yield return new DropdownOption((Action)(() => window.reference = childReference), "Open");
                    yield return new DropdownOption((Action)(() => GraphWindow.OpenTab(childReference)), "Open in new window");
                }

                foreach (var baseOption in base.contextOptions)
                {
                    yield return baseOption;
                }
            }
        }

        protected override void OnDoubleClick()
        {
            if (unit.graph.zoom == 1)
            {
                var childReference = reference.ChildReference(unit, false);

                if (childReference != null)
                {
                    if (e.ctrlOrCmd)
                    {
                        GraphWindow.OpenTab(childReference);
                    }
                    else
                    {
                        window.reference = childReference;
                    }
                }

                e.Use();
            }
            else
            {
                base.OnDoubleClick();
            }
        }
    }
}