From f7952b4954a6b03e492a7f7709d93836e9074e9f Mon Sep 17 00:00:00 2001
From: Joel Christner <joel.christner@gmail.com>
Date: Fri, 19 Jun 2026 21:58:49 -0700
Subject: [PATCH] Fix DEC special graphics lower-right corner

---
 src/XTerm.NET.Tests/InputHandlerTests.cs | 15 +++++++++++++++
 src/XTerm.NET/Common/Charsets.cs         |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/XTerm.NET.Tests/InputHandlerTests.cs b/src/XTerm.NET.Tests/InputHandlerTests.cs
index 4fd205f..c6da7e2 100644
--- a/src/XTerm.NET.Tests/InputHandlerTests.cs
+++ b/src/XTerm.NET.Tests/InputHandlerTests.cs
@@ -64,6 +64,21 @@ public void Print_MultipleCharacters_PrintsSequentially()
         Assert.Equal("Hello", line.TranslateToString(true, 0, 5));
     }
 
+    [Fact]
+    public void Write_DecSpecialGraphics_MapsCornersCorrectly()
+    {
+        // Arrange
+        var terminal = CreateTerminal();
+
+        // Act
+        terminal.Write("\x1B(0jklmqx\x1B(Bj");
+
+        // Assert
+        var line = terminal.Buffer.Lines[0];
+        Assert.NotNull(line);
+        Assert.Equal("\u2518\u2510\u250c\u2514\u2500\u2502j", line.TranslateToString(true));
+    }
+
     [Fact]
     public void HandleCsi_CursorUp_MovesCursor()
     {
diff --git a/src/XTerm.NET/Common/Charsets.cs b/src/XTerm.NET/Common/Charsets.cs
index da1df6e..b8a6a01 100644
--- a/src/XTerm.NET/Common/Charsets.cs
+++ b/src/XTerm.NET/Common/Charsets.cs
@@ -14,7 +14,7 @@ public static class Charsets
     public static readonly Dictionary<char, string> VT100LineDrawing = new()
     {
         // Box Drawing Characters
-        { 'j', "\u250c" }, // ? Bottom right corner
+        { 'j', "\u2518" }, // ? Bottom right corner
         { 'k', "\u2510" }, // ? Top right corner
         { 'l', "\u250c" }, // ? Top left corner
         { 'm', "\u2514" }, // ? Bottom left corner