From a8fed229f6848f9f0128ece2f911e560db96ac12 Mon Sep 17 00:00:00 2001
From: Julien Lebosquain <julien@lebosquain.net>
Date: Sun, 24 Aug 2025 15:18:17 +0200
Subject: [PATCH] Fix font memory leak in tests (#19514)

---
 src/Avalonia.Base/Media/FontManager.cs                | 11 ++++++++++-
 .../Media/CustomFontManagerImpl.cs                    |  7 ++++++-
 tests/Avalonia.UnitTests/UnitTestApplication.cs       |  3 ++-
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/Avalonia.Base/Media/FontManager.cs b/src/Avalonia.Base/Media/FontManager.cs
index 77118b06a9..2671305222 100644
--- a/src/Avalonia.Base/Media/FontManager.cs
+++ b/src/Avalonia.Base/Media/FontManager.cs
@@ -15,7 +15,7 @@ namespace Avalonia.Media
     ///     The font manager is used to query the system's installed fonts and is responsible for caching loaded fonts.
     ///     It is also responsible for the font fallback.
     /// </summary>
-    public sealed class FontManager
+    public sealed class FontManager : IDisposable
     {
         internal static Uri SystemFontsKey = new Uri("fonts:SystemFonts", UriKind.Absolute);
 
@@ -368,5 +368,14 @@ namespace Avalonia.Media
 
             return defaultFontFamilyName;
         }
+
+        void IDisposable.Dispose()
+        {
+            foreach (var pair in _fontCollections)
+                pair.Value.Dispose();
+
+            _fontCollections.Clear();
+            (PlatformImpl as IDisposable)?.Dispose();
+        }
     }
 }
diff --git a/tests/Avalonia.Skia.UnitTests/Media/CustomFontManagerImpl.cs b/tests/Avalonia.Skia.UnitTests/Media/CustomFontManagerImpl.cs
index 22dd2dd8fe..e3db4a05ea 100644
--- a/tests/Avalonia.Skia.UnitTests/Media/CustomFontManagerImpl.cs
+++ b/tests/Avalonia.Skia.UnitTests/Media/CustomFontManagerImpl.cs
@@ -10,7 +10,7 @@ using System.IO;
 
 namespace Avalonia.Skia.UnitTests.Media
 {
-    public class CustomFontManagerImpl : IFontManagerImpl
+    public class CustomFontManagerImpl : IFontManagerImpl, IDisposable
     {
         private readonly string _defaultFamilyName;
         private readonly IFontCollection _customFonts;
@@ -94,5 +94,10 @@ namespace Avalonia.Skia.UnitTests.Media
 
             return true;
         }
+
+        public void Dispose()
+        {
+            _customFonts.Dispose();
+        }
     }
 }
diff --git a/tests/Avalonia.UnitTests/UnitTestApplication.cs b/tests/Avalonia.UnitTests/UnitTestApplication.cs
index 722f97b78b..296c62d5af 100644
--- a/tests/Avalonia.UnitTests/UnitTestApplication.cs
+++ b/tests/Avalonia.UnitTests/UnitTestApplication.cs
@@ -51,7 +51,8 @@ namespace Avalonia.UnitTests
                 }
 
                 ((ToolTipService)AvaloniaLocator.Current.GetService<IToolTipService>())?.Dispose();
-                
+                (AvaloniaLocator.Current.GetService<FontManager>() as IDisposable)?.Dispose();
+
                 Dispatcher.ResetForUnitTests();
                 scope.Dispose();
                 Dispatcher.ResetBeforeUnitTests();