[C] SetterSpecificity

each SetValue call has a specificity, and the specificity can be used to
determine which value needs to be applied/unapplied/restored

src/Compatibility/ControlGallery/src/Core/CoreGalleryPages/CoreGalleryPage.cs

@@ -65,7 +65,7 @@ protected virtual void InitializeElement(T element) { }
 		protected virtual void Build(StackLayout stackLayout)
 		{
 			var isFocusedView = new T();
-			isFocusedView.SetValueCore(IsFocusedPropertyKey, true);
+			isFocusedView.SetValue(IsFocusedPropertyKey, true, specificity: SetterSpecificity.FromHandler);
 
 			IsEnabledStateViewContainer = new StateViewContainer<T>(Test.VisualElement.IsEnabled, new T { IsEnabled = true });
 			IsEnabledStateViewContainer.StateChangeButton.Command = new Command(() =>
@@ -85,11 +85,11 @@ protected virtual void Build(StackLayout stackLayout)
 
 				if ((bool)isFocusedView.GetValue(VisualElement.IsFocusedProperty))
 				{
-					isFocusedView.SetValueCore(IsFocusedPropertyKey, false);
+					isFocusedView.SetValue(IsFocusedPropertyKey, false, specificity: SetterSpecificity.FromHandler);
 				}
 				else
 				{
-					isFocusedView.SetValueCore(IsFocusedPropertyKey, true);
+					isFocusedView.SetValue(IsFocusedPropertyKey, true, specificity: SetterSpecificity.FromHandler);
 				}
 			});
 

src/Controls/src/Core/AppThemeBinding.cs

@@ -9,6 +9,7 @@ class AppThemeBinding : BindingBase
 		WeakReference<BindableObject> _weakTarget;
 		BindableProperty _targetProperty;
 		bool _attached;
+		SetterSpecificity specificity;
 
 		internal override BindingBase Clone() => new AppThemeBinding
 		{
@@ -26,12 +27,13 @@ internal override void Apply(bool fromTarget)
 			SetAttached(true);
 		}
 
-		internal override void Apply(object context, BindableObject bindObj, BindableProperty targetProperty, bool fromBindingContextChanged = false)
+		internal override void Apply(object context, BindableObject bindObj, BindableProperty targetProperty, bool fromBindingContextChanged, SetterSpecificity specificity)
 		{
 			_weakTarget = new WeakReference<BindableObject>(bindObj);
 			_targetProperty = targetProperty;
-			base.Apply(context, bindObj, targetProperty, fromBindingContextChanged);
-			ApplyCore();
+			base.Apply(context, bindObj, targetProperty, fromBindingContextChanged, specificity);
+			this.specificity = specificity;
+			ApplyCore(false);
 			SetAttached(true);
 		}
 
@@ -59,7 +61,7 @@ void ApplyCore(bool dispatch = false)
 			else
 				Set();
 
-			void Set() => target.SetValueCore(_targetProperty, GetValue());
+			void Set() => target.SetValueCore(_targetProperty, GetValue(), Internals.SetValueFlags.ClearDynamicResource, BindableObject.SetValuePrivateFlags.Default | BindableObject.SetValuePrivateFlags.Converted, specificity);
 		}
 
 		object _light;
@@ -141,4 +143,4 @@ void SetAttached(bool value)
 			}
 		}
 	}
-}
+}