From 82b69933f35dd7bab0db3100da4475e27b1f4c21 Mon Sep 17 00:00:00 2001
From: JieXu <xujie0739@gmail.com>
Date: Thu, 25 Sep 2025 05:08:39 +0800
Subject: [PATCH] Update MsgView.axaml.cs

---
 v2rayN/v2rayN.Desktop/Views/MsgView.axaml.cs | 21 +++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/v2rayN/v2rayN.Desktop/Views/MsgView.axaml.cs b/v2rayN/v2rayN.Desktop/Views/MsgView.axaml.cs
index e2d21101..7ce0ad07 100644
--- a/v2rayN/v2rayN.Desktop/Views/MsgView.axaml.cs
+++ b/v2rayN/v2rayN.Desktop/Views/MsgView.axaml.cs
@@ -11,6 +11,7 @@ namespace v2rayN.Desktop.Views;
 public partial class MsgView : ReactiveUserControl<MsgViewModel>
 {
     private readonly ScrollViewer _scrollViewer;
+    private int _lastShownLength = 0;
 
     public MsgView()
     {
@@ -44,11 +45,25 @@ public partial class MsgView : ReactiveUserControl<MsgViewModel>
 
     private void ShowMsg(object msg)
     {
-        txtMsg.Text = msg.ToString();
-        if (togScrollToEnd.IsChecked ?? true)
+        var newText = msg?.ToString() ?? string.Empty;
+
+        if (txtMsg.Text is { } old && newText.Length >= _lastShownLength && newText.AsSpan(0, _lastShownLength).SequenceEqual(old))
         {
-            _scrollViewer?.ScrollToEnd();
+            var delta = newText.AsSpan(_lastShownLength);
+            if (!delta.IsEmpty)
+                txtMsg.Text += delta.ToString();
         }
+        else
+        {
+            txtMsg.Text = newText;
+        }
+
+        _lastShownLength = txtMsg.Text.Length;
+
+        if (togScrollToEnd.IsChecked ?? true)
+            Avalonia.Threading.Dispatcher.UIThread.Post(
+                () => _scrollViewer?.ScrollToEnd(),
+                Avalonia.Threading.DispatcherPriority.Render);
     }
 
     public void ClearMsg()