From 47cc3ff1f7e3fe5b603dc5a6a8a8cc5d560ca3df Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Wies=C5=82aw=20S=CC=8Colte=CC=81s?=
 <wieslaw.soltes@gmail.com>
Date: Tue, 6 May 2025 12:25:13 +0200
Subject: [PATCH] Revert "We don't actually need to Add child in AddChild"

This reverts commit c2cd3012ca7fb0b007872e8a1bf0f54ef3cf4cea.
---
 src/Avalonia.Base/Styling/StyleBase.cs | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/Avalonia.Base/Styling/StyleBase.cs b/src/Avalonia.Base/Styling/StyleBase.cs
index dbffcfb3ee..fc293f4bda 100644
--- a/src/Avalonia.Base/Styling/StyleBase.cs
+++ b/src/Avalonia.Base/Styling/StyleBase.cs
@@ -72,11 +72,24 @@ namespace Avalonia.Styling
         public void Add(SetterBase setter) => Setters.Add(setter);
         public void Add(IStyle style) => Children.Add(style);
 
-        void IAddChild.AddChild(object child) { }
+        void IAddChild.AddChild(object child)
+        {
+            switch (child)
+            {
+                case SetterBase setter:
+                    Setters.Add(setter);
+                    break;
+                case IStyle style:
+                    Children.Add(style);
+                    break;
+                default:
+                    throw new InvalidOperationException($"Cannot add {child.GetType()} to a style.");
+            }
+        }
 
-        void IAddChild<SetterBase>.AddChild(SetterBase setter) { }
+        void IAddChild<SetterBase>.AddChild(SetterBase setter) => Setters.Add(setter); 
 
-        void IAddChild<IStyle>.AddChild(IStyle style) { }
+        void IAddChild<IStyle>.AddChild(IStyle style) => Children.Add(style);
 
         public event EventHandler? OwnerChanged;