Remove unused code.

src/Avalonia.Base/PropertyStore/EffectiveValue.cs

@@ -19,12 +19,6 @@ namespace Avalonia.PropertyStore
         /// </summary>
         public object? Value => GetBoxedValue();
 
-        /// <summary>
-        /// Gets the current effective base value as a boxed value, or 
-        /// <see cref="AvaloniaProperty.UnsetValue"/> if not set.
-        /// </summary>
-        public object? BaseValue => GetBoxedBaseValue();
-
         /// <summary>
         /// Gets the priority of the current effective value.
         /// </summary>
@@ -86,22 +80,6 @@ namespace Avalonia.PropertyStore
             IValueEntry value,
             BindingPriority priority);
 
-        /// <summary>
-        /// Sets the value and base value for a non-LocalValue priority, raising 
-        /// <see cref="AvaloniaObject.PropertyChanged"/> where necessary.
-        /// </summary>
-        /// <param name="owner">The associated value store.</param>
-        /// <param name="value">The new value of the property.</param>
-        /// <param name="priority">The priority of the new value.</param>
-        /// <param name="baseValue">The new base value of the property.</param>
-        /// <param name="basePriority">The priority of the new base value.</param>
-        public abstract void SetAndRaise(
-            ValueStore owner,
-            IValueEntry value,
-            BindingPriority priority,
-            IValueEntry baseValue,
-            BindingPriority basePriority);
-
         /// <summary>
         /// Raises <see cref="AvaloniaObject.PropertyChanged"/> in response to an inherited value
         /// change.
@@ -140,7 +118,6 @@ namespace Avalonia.PropertyStore
         public abstract void DisposeAndRaiseUnset(ValueStore owner, AvaloniaProperty property);
 
         protected abstract object? GetBoxedValue();
-        protected abstract object? GetBoxedBaseValue();
 
         protected void UpdateValueEntry(IValueEntry? entry, BindingPriority priority)
         {

src/Avalonia.Base/PropertyStore/EffectiveValue`1.cs

@@ -26,6 +26,7 @@ namespace Avalonia.PropertyStore
         {
             Value = value;
             Priority = priority;
+            BasePriority = BindingPriority.Unset;
 
             if (property.HasCoercion &&
                 property.GetMetadata(owner.GetType()) is { } metadata &&
@@ -40,17 +41,6 @@ namespace Avalonia.PropertyStore
 
                 value = coerce(owner, value);
             }
-
-            if (priority >= BindingPriority.LocalValue && priority < BindingPriority.Inherited)
-            {
-                _baseValue = value;
-                BasePriority = priority;
-            }
-            else
-            {
-                _baseValue = default;
-                BasePriority = BindingPriority.Unset;
-            }
         }
 
         /// <summary>
@@ -68,17 +58,6 @@ namespace Avalonia.PropertyStore
             SetAndRaiseCore(owner, (StyledPropertyBase<T>)value.Property, (T)value.GetValue()!, priority);
         }
 
-        public override void SetAndRaise(
-            ValueStore owner,
-            IValueEntry value,
-            BindingPriority priority,
-            IValueEntry baseValue,
-            BindingPriority basePriority)
-        {
-            Debug.Assert(priority != BindingPriority.LocalValue);
-            SetAndRaiseCore(owner, (StyledPropertyBase<T>)value.Property, (T)value.GetValue()!, priority, (T)baseValue!, basePriority);
-        }
-
         public void SetLocalValueAndRaise(
             ValueStore owner,
             StyledPropertyBase<T> property,
@@ -165,11 +144,6 @@ namespace Avalonia.PropertyStore
 
         protected override object? GetBoxedValue() => Value;
         
-        protected override object? GetBoxedBaseValue()
-        {
-            return BasePriority != BindingPriority.Unset ? _baseValue : AvaloniaProperty.UnsetValue;
-        }
-
         private void SetAndRaiseCore(
             ValueStore owner,
             StyledPropertyBase<T> property,