Fix theme not work with 'Use System Setting'

Author: CodingOctocat

IPConfig/Helpers/ThemeManager.cs

@@ -47,13 +47,6 @@ private set
 
     public static void UpdateSkin(SkinType? skin)
     {
-        if (skin == CurrentSkinTypeMode)
-        {
-            return;
-        }
-
-        ThemeChanging?.Invoke(null, skin);
-
         SkinType actualSkinType;
 
         if (skin is null)
@@ -65,6 +58,13 @@ public static void UpdateSkin(SkinType? skin)
             actualSkinType = skin.Value;
         }
 
+        if (actualSkinType == CurrentSkinType)
+        {
+            return;
+        }
+
+        ThemeChanging?.Invoke(null, skin);
+
         App.Current.Resources.MergedDictionaries.Clear();
 
         App.Current.Resources.MergedDictionaries.Add(new ResourceDictionary {