fix: bind to TextDocument instead if custom binding behavior

MainWindow.axaml

@@ -3,9 +3,7 @@
     xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:AvaloniaEdit="clr-namespace:AvaloniaEdit;assembly=AvaloniaEdit"
-    xmlns:behaviors="clr-namespace:SharpFM.Behaviors;assembly=SharpFM"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-    xmlns:i="clr-namespace:Avalonia.Xaml.Interactivity;assembly=Avalonia.Xaml.Interactivity"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:vm="using:SharpFM.ViewModels"
     Icon="/Assets/noun-sharp-teeth-monster-4226695.small.png"
@@ -169,7 +167,7 @@
                                 Text="Clip Content" />
                         </Border>
 
-                        <!-- AvaloniaEdit component (unchanged) -->
+                        <!-- AvaloniaEdit component with Document binding -->
                         <Border 
                             Grid.Row="1"
                             CornerRadius="0,0,8,8"
@@ -179,11 +177,8 @@
                                 FontFamily="Cascadia Code,Consolas,Menlo,Monospace"
                                 ShowLineNumbers="True"
                                 SyntaxHighlighting="Xml"
-                                WordWrap="False">
-                                <i:Interaction.Behaviors>
-                                    <behaviors:DocumentTextBindingBehavior Text="{Binding SelectedClip.ClipXml, Mode=TwoWay}" />
-                                </i:Interaction.Behaviors>
-                            </AvaloniaEdit:TextEditor>
+                                WordWrap="False"
+                                Document="{Binding SelectedClip.XmlDocument}" />
                         </Border>
                     </Grid>
                 </Border>

ViewModels/ClipViewModel.cs

@@ -1,5 +1,6 @@
 using System.ComponentModel;
 using System.Runtime.CompilerServices;
+using AvaloniaEdit.Document;
 
 namespace SharpFM.ViewModels;
 
@@ -13,6 +14,8 @@ private void NotifyPropertyChanged([CallerMemberName] string propertyName = "")
     }
 
     public FileMakerClip Clip { get; set; }
+
+    private TextDocument? _xmlDocument;
 
     public ClipViewModel(FileMakerClip clip)
     {
@@ -39,13 +42,30 @@ public string Name
         }
     }
 
+    public TextDocument XmlDocument
+    {
+        get
+        {
+            if (_xmlDocument == null)
+            {
+                _xmlDocument = new TextDocument(Clip.XmlData ?? string.Empty);
+            }
+            return _xmlDocument;
+        }
+    }
+
     public string ClipXml
     {
-        get => Clip.XmlData;
+        get => _xmlDocument?.Text ?? Clip.XmlData;
         set
         {
             Clip.XmlData = value;
+            if (_xmlDocument != null)
+            {
+                _xmlDocument.Text = value ?? string.Empty;
+            }
             NotifyPropertyChanged();
+            NotifyPropertyChanged(nameof(XmlDocument));
         }
     }
 }