fix: endless loop when character missing both in current active font and the default font and the fallback font is same with the default.

src/SourceGit/App.axaml.cs

@@ -175,8 +175,15 @@ namespace SourceGit
         {
             AvaloniaXamlLoader.Load(this);
 
-            SetLocale(ViewModels.Preference.Instance.Locale);
+            var pref = ViewModels.Preference.Instance;
-            SetTheme(ViewModels.Preference.Instance.Theme);
+
+            SetLocale(pref.Locale);
+            SetTheme(pref.Theme);
+
+            if (string.IsNullOrEmpty(pref.DefaultFont))
+            {
+                pref.DefaultFont = FontManager.Current.DefaultFontFamily.ToString();
+            }
         }
 
         public override void OnFrameworkInitializationCompleted()

src/SourceGit/Native/Linux.cs

@@ -4,6 +4,7 @@ using System.Runtime.Versioning;
 
 using Avalonia;
 using Avalonia.Dialogs;
+using Avalonia.Media;
 
 namespace SourceGit.Native
 {
@@ -12,9 +13,11 @@ namespace SourceGit.Native
     {
         public void SetupApp(AppBuilder builder)
         {
-#if USE_FONT_INTER
+            builder.With(new FontManagerOptions()
-            builder.WithInterFont();
+            {
-#endif
+                DefaultFamilyName = "fonts:SourceGit#JetBrains Mono",
+            });
+
             // Free-desktop file picker has an extra black background panel.
             builder.UseManagedSystemDialogs();
         }

src/SourceGit/Native/MacOS.cs

@@ -16,9 +16,6 @@ namespace SourceGit.Native
             builder.With(new FontManagerOptions()
             {
                 DefaultFamilyName = "PingFang SC",
-                FontFallbacks = [
-                    new FontFallback { FontFamily = new FontFamily("PingFang SC") }
-                ]
             });
         }
 

src/SourceGit/Native/Windows.cs

@@ -21,9 +21,6 @@ namespace SourceGit.Native
             builder.With(new FontManagerOptions()
             {
                 DefaultFamilyName = "Microsoft YaHei UI",
-                FontFallbacks = [
-                    new FontFallback { FontFamily = new FontFamily("Microsoft YaHei UI") }
-                ]
             });
         }
 

src/SourceGit/SourceGit.csproj

@@ -20,10 +20,6 @@
     <RepositoryType>Public</RepositoryType>
   </PropertyGroup>
 
-  <PropertyGroup Condition="$([MSBuild]::IsOSPlatform('Linux'))">
-    <DefineConstants>$(DefineConstants);USE_FONT_INTER</DefineConstants>
-  </PropertyGroup>
-
   <ItemGroup>
     <AvaloniaResource Include="App.ico" />
     <AvaloniaResource Include="Resources/Fonts/*" />
@@ -47,7 +43,6 @@
 
   <ItemGroup>
     <PackageReference Include="Avalonia" Version="11.0.10" />
-    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.10" Condition="$([MSBuild]::IsOSPlatform('Linux'))" />
     <PackageReference Include="Avalonia.Desktop" Version="11.0.10" />
     <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.10" />
     <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.0.10" />

src/SourceGit/Views/Preference.axaml.cs

@@ -72,8 +72,6 @@ namespace SourceGit.Views
             InstalledFonts = new AvaloniaList<FontFamily>();
             InstalledFonts.Add(new FontFamily("fonts:SourceGit#JetBrains Mono"));
             InstalledFonts.AddRange(FontManager.Current.SystemFonts);
-            InstalledFonts.Remove(FontManager.Current.DefaultFontFamily);
-            InstalledFonts.Add(FontManager.Current.DefaultFontFamily);
 
             InstalledMonospaceFonts = new AvaloniaList<FontFamily>();
             InstalledMonospaceFonts.Add(new FontFamily("fonts:SourceGit#JetBrains Mono"));