From bdbd9dca16fe9696cec47dcdef702cab8c3d5db8 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 31 Jul 2026 17:29:17 +0000
Subject: [PATCH 1/3] Initial plan


From 3ff28223fc18170e251100e54261c360b28e66f0 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 31 Jul 2026 17:32:07 +0000
Subject: [PATCH 2/3] Preserve empty output lines from telnet events

---
 src/SharpMUTerm.Core/Session/WorldSession.cs       |  7 +++++++
 .../Session/WorldSessionTests.cs                   | 14 ++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/src/SharpMUTerm.Core/Session/WorldSession.cs b/src/SharpMUTerm.Core/Session/WorldSession.cs
index 2135679..87f7a92 100644
--- a/src/SharpMUTerm.Core/Session/WorldSession.cs
+++ b/src/SharpMUTerm.Core/Session/WorldSession.cs
@@ -312,15 +312,22 @@ private void OnOutputReceived(object? sender, TelnetOutputEventArgs e)
             return;
         }
 
+        var emitted = false;
         foreach (var completed in _parser.Feed(e.Text))
         {
             ProcessOutputLine(completed);
+            emitted = true;
         }
 
         var tail = _parser.Flush();
         if (tail is not null)
         {
             ProcessOutputLine(tail);
+            emitted = true;
+        }
+        else if (!emitted)
+        {
+            ProcessOutputLine(StyledLine.Empty);
         }
     }
 
diff --git a/tests/SharpMUTerm.Core.Tests/Session/WorldSessionTests.cs b/tests/SharpMUTerm.Core.Tests/Session/WorldSessionTests.cs
index 8cffdaa..364b7c2 100644
--- a/tests/SharpMUTerm.Core.Tests/Session/WorldSessionTests.cs
+++ b/tests/SharpMUTerm.Core.Tests/Session/WorldSessionTests.cs
@@ -34,6 +34,20 @@ public async Task OutputLine_IsAppendedToScrollbackAndRaisesEvent()
         await Assert.That(printed).IsNotNull();
     }
 
+    [Test]
+    public async Task EmptyOutputLine_IsAppendedAsBlankLine()
+    {
+        var (session, telnet) = Create(World());
+        await session.ConnectAsync();
+        var before = session.Scrollback.Snapshot().Count;
+
+        telnet.EmitLine(string.Empty);
+
+        var after = session.Scrollback.Snapshot();
+        await Assert.That(after.Count).IsEqualTo(before + 1);
+        await Assert.That(after[^1].IsEmpty).IsTrue();
+    }
+
     [Test]
     public async Task AnsiColor_InOutput_IsParsedIntoStyledSpans()
     {

From 44bfbf8f202bd9abe7db0d767a3be6ea90e88b08 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 31 Jul 2026 17:40:23 +0000
Subject: [PATCH 3/3] Add same-frame blank-line regression test

---
 .../Session/WorldSessionTests.cs                 | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tests/SharpMUTerm.Core.Tests/Session/WorldSessionTests.cs b/tests/SharpMUTerm.Core.Tests/Session/WorldSessionTests.cs
index 364b7c2..4efdc8f 100644
--- a/tests/SharpMUTerm.Core.Tests/Session/WorldSessionTests.cs
+++ b/tests/SharpMUTerm.Core.Tests/Session/WorldSessionTests.cs
@@ -48,6 +48,22 @@ public async Task EmptyOutputLine_IsAppendedAsBlankLine()
         await Assert.That(after[^1].IsEmpty).IsTrue();
     }
 
+    [Test]
+    public async Task SameFrame_OutputPreservesAnEmptyMiddleLine()
+    {
+        var (session, telnet) = Create(World());
+        await session.ConnectAsync();
+        var before = session.Scrollback.Snapshot().Count;
+
+        telnet.EmitLine("Line one\n\nThis line three, previous line was empty, this is valid output. It came from the same received frame.");
+
+        var after = session.Scrollback.Snapshot();
+        await Assert.That(after.Count).IsEqualTo(before + 3);
+        await Assert.That(after[before].Text).IsEqualTo("Line one");
+        await Assert.That(after[before + 1].IsEmpty).IsTrue();
+        await Assert.That(after[before + 2].Text).IsEqualTo("This line three, previous line was empty, this is valid output. It came from the same received frame.");
+    }
+
     [Test]
     public async Task AnsiColor_InOutput_IsParsedIntoStyledSpans()
     {