Fix color scheme hot switching

src/Avalonia.FreeDesktop/DBusPlatformSettings.cs

@@ -32,29 +32,35 @@ namespace Avalonia.FreeDesktop
             try
             {
                 var value = await _settings!.ReadAsync("org.freedesktop.appearance", "color-scheme");
-                _themeVariant = ReadAsColorScheme(value);
+                _themeVariant = ToColorScheme(((value.Value as DBusVariantItem)!.Value as DBusUInt32Item)!.Value);
             }
             catch (Exception ex)
             {
                 Logger.TryGet(LogEventLevel.Error, LogArea.FreeDesktopPlatform)?.Log(this, "Unable to get org.freedesktop.appearance.color-scheme value", ex);
             }
 
+            _accentColor = await TryGetAccentColorAsync();
+
+            _lastColorValues = BuildPlatformColorValues();
+            if (_lastColorValues is not null)
+                OnColorValuesChanged(_lastColorValues);
+        }
+
+        private async Task<Color?> TryGetAccentColorAsync()
+        {
             try
             {
                 var value = await _settings!.ReadAsync("org.kde.kdeglobals.General", "AccentColor");
-                _accentColor = ReadAsAccentColor(value);
+                return ToAccentColor(((value.Value as DBusVariantItem)!.Value as DBusStringItem)!.Value);
             }
             catch (Exception ex)
             {
                 Logger.TryGet(LogEventLevel.Error, LogArea.FreeDesktopPlatform)?.Log(this, "Unable to get org.kde.kdeglobals.General.AccentColor value", ex);
+                return null;
             }
-
-            _lastColorValues = BuildPlatformColorValues();
-            if (_lastColorValues is not null)
-                OnColorValuesChanged(_lastColorValues);
         }
 
-        private void SettingsChangedHandler(Exception? exception, (string @namespace, string key, DBusVariantItem value) valueTuple)
+        private async void SettingsChangedHandler(Exception? exception, (string @namespace, string key, DBusVariantItem value) valueTuple)
         {
             if (exception is not null)
                 return;
@@ -62,12 +68,8 @@ namespace Avalonia.FreeDesktop
             switch (valueTuple)
             {
                 case ("org.freedesktop.appearance", "color-scheme", { } colorScheme):
-                    _themeVariant = ReadAsColorScheme(colorScheme);
+                    _themeVariant = ToColorScheme((colorScheme.Value as DBusUInt32Item)!.Value);
-                    _lastColorValues = BuildPlatformColorValues();
+                    _accentColor = await TryGetAccentColorAsync();
-                    OnColorValuesChanged(_lastColorValues!);
-                    break;
-                case ("org.kde.kdeglobals.General", "AccentColor", { } accentColor):
-                    _accentColor = ReadAsAccentColor(accentColor);
                     _lastColorValues = BuildPlatformColorValues();
                     OnColorValuesChanged(_lastColorValues!);
                     break;
@@ -85,21 +87,20 @@ namespace Avalonia.FreeDesktop
             return null;
         }
 
-        private static PlatformThemeVariant ReadAsColorScheme(DBusVariantItem value)
+        private static PlatformThemeVariant ToColorScheme(uint value)
         {
             /*
             <member>0: No preference</member>
             <member>1: Prefer dark appearance</member>
             <member>2: Prefer light appearance</member>
             */
-            var isDark = ((value.Value as DBusVariantItem)!.Value as DBusUInt32Item)!.Value == 1;
+            var isDark = value == 1;
             return isDark ? PlatformThemeVariant.Dark : PlatformThemeVariant.Light;
         }
 
-        private static Color ReadAsAccentColor(DBusVariantItem value)
+        private static Color ToAccentColor(string value)
         {
-            var colorStr = ((value.Value as DBusVariantItem)!.Value as DBusStringItem)!.Value;
+            var rgb = value.Split(',');
-            var rgb = colorStr.Split(',');
             return new Color(255, byte.Parse(rgb[0]), byte.Parse(rgb[1]), byte.Parse(rgb[2]));
         }
     }