Fix benchmarks build

src/Avalonia.Base/Controls/ResourceDictionary.cs

@@ -192,7 +192,7 @@ namespace Avalonia.Controls
             if (_themeDictionary is not null)
             {
                 IResourceProvider? themeResourceProvider;
-                if (theme is not null)
+                if (theme is not null && theme != ThemeVariant.Default)
                 {
                     if (_themeDictionary.TryGetValue(theme, out themeResourceProvider)
                         && themeResourceProvider.TryGetResource(key, theme, out value))

tests/Avalonia.Benchmarks/Themes/ThemeBenchmark.cs

@@ -29,26 +29,16 @@ namespace Avalonia.Benchmarks.Themes
         }
 
         [Benchmark]
-        [Arguments(FluentThemeMode.Dark)]
-        [Arguments(FluentThemeMode.Light)]
-        public bool InitFluentTheme(FluentThemeMode mode)
+        public bool InitFluentTheme()
         {
-            UnitTestApplication.Current.Styles[0] = new FluentTheme()
-            {
-                Mode = mode
-            };
+            UnitTestApplication.Current.Styles[0] = new FluentTheme();
             return ((IResourceHost)UnitTestApplication.Current).TryGetResource("SystemAccentColor", out _);
         }
 
         [Benchmark]
-        [Arguments(SimpleThemeMode.Dark)]
-        [Arguments(SimpleThemeMode.Light)]
-        public bool InitSimpleTheme(SimpleThemeMode mode)
+        public bool InitSimpleTheme()
         {
-            UnitTestApplication.Current.Styles[0] = new SimpleTheme()
-            {
-                Mode = mode
-            };
+            UnitTestApplication.Current.Styles[0] = new SimpleTheme();
             return ((IResourceHost)UnitTestApplication.Current).TryGetResource("ThemeAccentColor", out _);
         }
         
@@ -58,7 +48,7 @@ namespace Avalonia.Benchmarks.Themes
         [Arguments(typeof(DatePicker))]
         public object FindFluentControlTheme(Type type)
         {
-            _reusableFluentTheme.TryGetResource(type, out var theme);
+            _reusableFluentTheme.TryGetResource(type, ThemeVariant.Default, out var theme);
             return theme;
         }
 
@@ -68,7 +58,7 @@ namespace Avalonia.Benchmarks.Themes
         [Arguments(typeof(DatePicker))]
         public object FindSimpleControlTheme(Type type)
         {
-            _reusableSimpleTheme.TryGetResource(type, out var theme);
+            _reusableSimpleTheme.TryGetResource(type, ThemeVariant.Default, out var theme);
             return theme;
         }