Clean up DelayedSetter code.

src/Avalonia.Base/AvaloniaObject.cs

@@ -590,8 +590,8 @@ namespace Avalonia
             }
         }
 
-        protected void SetAndRaise<T>(AvaloniaProperty<T> property, Action<T, Action<Action>> setterCallback, T value)
-            => directDelayedSetter.SetAndNotify(property, (val, notify) => setterCallback((T)val, notify), value);
+        protected void SetAndRaise<T>(AvaloniaProperty<T> property, Action<T, Action<Action>> setterCallback, T value, Predicate<T> pendingSetCondition = null)
+            => directDelayedSetter.SetAndNotify(property, (val, notify) => setterCallback((T)val, notify), value, o => pendingSetCondition((T)o));
 
         /// <summary>
         /// Tries to cast a value to a type, taking into account that the value may be a

src/Avalonia.Base/Utilities/DelayedSetter.cs

@@ -86,8 +86,5 @@ namespace Avalonia.Utilities
                 AddPendingSet(property, value);
             }
         }
-
-        public void SetAndNotify(T property, Action<TValue, Action<Action>> setterCallback, TValue value)
-            => SetAndNotify(property, setterCallback, value, null);
     }
 }