From df4a56f39b5e3120b2ffcd6993e9e7555ead7c83 Mon Sep 17 00:00:00 2001
From: James Jackson-South <james_south@hotmail.com>
Date: Fri, 15 Sep 2023 18:27:27 +1000
Subject: [PATCH] Only apply swap for non-horizontal layout

---
 src/SixLabors.Fonts/TextLayout.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/SixLabors.Fonts/TextLayout.cs b/src/SixLabors.Fonts/TextLayout.cs
index 6f5a4648..7cf6552f 100644
--- a/src/SixLabors.Fonts/TextLayout.cs
+++ b/src/SixLabors.Fonts/TextLayout.cs
@@ -825,6 +825,11 @@ private static void SubstituteBidiMirrors(FontMetrics fontMetrics, GlyphSubstitu
 
         // TODO: This only replaces certain glyphs. We should investigate the specification further.
         // https://www.unicode.org/reports/tr50/#vertical_alternates
+        if (collection.TextOptions.LayoutMode.IsHorizontal())
+        {
+            return;
+        }
+
         for (int i = 0; i < collection.Count; i++)
         {
             GlyphShapingData data = collection[i];