From 96b423900f734c698932534dacefd59827557470 Mon Sep 17 00:00:00 2001
From: Julien Lebosquain <julien@lebosquain.net>
Date: Mon, 16 Jan 2023 11:50:14 +0100
Subject: [PATCH] TextRunProperties: don't allocate if the typeface hasn't
 changed

---
 src/Avalonia.Base/Media/TextFormatting/TextRunProperties.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Avalonia.Base/Media/TextFormatting/TextRunProperties.cs b/src/Avalonia.Base/Media/TextFormatting/TextRunProperties.cs
index 86b701cb4b..7bad99f33f 100644
--- a/src/Avalonia.Base/Media/TextFormatting/TextRunProperties.cs
+++ b/src/Avalonia.Base/Media/TextFormatting/TextRunProperties.cs
@@ -93,6 +93,9 @@ namespace Avalonia.Media.TextFormatting
         
         internal TextRunProperties WithTypeface(Typeface typeface)
         {
+            if (this is GenericTextRunProperties other && other.Typeface == typeface)
+                return this;
+
             return new GenericTextRunProperties(typeface, FontRenderingEmSize,
                 TextDecorations, ForegroundBrush, BackgroundBrush, BaselineAlignment);
         }