RangeOutliningSourceBase does not collapse correctly when multiple ranges have the same end offset.

I am having the same problem as in this old thread.   The syntax editor doesn't outline properly when using a RangeOutliningSourceBase when there are multiple outline ranges with the same end offset.

Code to reproduce the error is below.

using ActiproSoftware.Text.Implementation;
using ActiproSoftware.Windows.Controls.SyntaxEditor.Outlining;
using ActiproSoftware.Windows.Controls.SyntaxEditor.Outlining.Implementation;
using System.Windows;
using ActiproSoftware.Text;

namespace OutliningError
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            
            var doc = new EditorDocument();
            doc.SetText("a\n\tb\n\t\tc\nThis text should not be collapseable.\n" + 
                "Instead the collapse region for 'a' should end just after 'c'");
            doc.IsReadOnly = true;
            doc.Language = new TrivialLanguage();
            uiEditor.Document = doc;
           
        }
    }

    public class TrivialLanguage : SyntaxLanguage
    {
        public TrivialLanguage() : base("TrivialLanguage")
        {
            RegisterService<IOutliner>(new TrivialOutliner());
        }
    }

    public class TrivialOutliningSource : RangeOutliningSourceBase
    {
        public TrivialOutliningSource(ITextSnapshot snapshot) : base(snapshot)
        {
            var nodeDef = new OutliningNodeDefinition("nodeDefKey")
            {
                IsCollapsible = true
            };
            AddNode(new TextRange(1, 8), nodeDef);
            AddNode(new TextRange(4, 8), nodeDef);
        }
    }

    public class TrivialOutliner : IOutliner
    {
        public AutomaticOutliningUpdateTrigger UpdateTrigger
        {
            get
            {
                return AutomaticOutliningUpdateTrigger.TextChanged;
            }
        }

        public IOutliningSource GetOutliningSource(ITextSnapshot snapshot)
        {
            return new TrivialOutliningSource(snapshot);
        }
    }

}

<Window x:Class="OutliningError.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:syntaxeditor="http://schemas.actiprosoftware.com/winfx/xaml/syntaxeditor" 
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <syntaxeditor:SyntaxEditor x:Name="uiEditor"/>
    </Grid>
</Window>

 Also, sorry to post this all twice.  I posted it again here because I thought it may get missed at the end of a 3 year old thread.