Fixed metadata overrides not being able to add coercion to a property which didn't already have it

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

@@ -31,7 +31,7 @@ namespace Avalonia.PropertyStore
 
             var value = inherited is null ? _metadata.DefaultValue : inherited.Value;
 
-            if (property.HasCoercion && _metadata.CoerceValue is { } coerce)
+            if (_metadata.CoerceValue is { } coerce)
             {
                 _uncommon = new()
                 {

src/Avalonia.Base/StyledProperty.cs

@@ -34,7 +34,6 @@ namespace Avalonia
         {
             Inherits = inherits;
             ValidateValue = validate;
-            HasCoercion |= metadata.CoerceValue != null;
 
             if (validate?.Invoke(metadata.DefaultValue) == false)
             {
@@ -48,12 +47,6 @@ namespace Avalonia
         /// </summary>
         public Func<TValue, bool>? ValidateValue { get; }
 
-        /// <summary>
-        /// Gets a value indicating whether this property has any value coercion callbacks defined
-        /// in its metadata.
-        /// </summary>
-        internal bool HasCoercion { get; private set; }
-
         /// <summary>
         /// Registers the property on another type.
         /// </summary>
@@ -130,10 +123,7 @@ namespace Avalonia
         /// </summary>
         /// <typeparam name="T">The type.</typeparam>
         /// <param name="metadata">The metadata.</param>
-        public void OverrideMetadata<T>(StyledPropertyMetadata<TValue> metadata) where T : AvaloniaObject
-        {
-            base.OverrideMetadata(typeof(T), metadata);
-        }
+        public void OverrideMetadata<T>(StyledPropertyMetadata<TValue> metadata) where T : AvaloniaObject => OverrideMetadata(typeof(T), metadata);
 
         /// <summary>
         /// Overrides the metadata for the property on the specified type.
@@ -151,8 +141,6 @@ namespace Avalonia
                 }
             }
 
-            HasCoercion |= metadata.CoerceValue != null;
-
             base.OverrideMetadata(type, metadata);
         }