Remove AvaloniaListAttribute

src/Avalonia.Base/Metadata/AvaloniaListAttribute.cs

@@ -1,12 +0,0 @@
-using System;
-
-namespace Avalonia.Metadata;
-
-[AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = true)]
-public sealed class AvaloniaListAttribute : Attribute
-{
-    public string[]? Separators { get; init; }
-
-    // StringSplitOptions.TrimEntries = 2, but only on net6 target.
-    public StringSplitOptions SplitOptions { get; init; } = StringSplitOptions.RemoveEmptyEntries | (StringSplitOptions)2;
-}

src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/AvaloniaXamlIlLanguageParseIntrinsics.cs

@@ -338,20 +338,6 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions
                     var separators = new[] { "," };
                     var splitOptions = StringSplitOptions.RemoveEmptyEntries | trimOption;
 
-                    var attribute = type.CustomAttributes.FirstOrDefault(a => a.Type == types.AvaloniaListAttribute);
-                    if (attribute is not null)
-                    {
-                        if (attribute.Properties.TryGetValue("Separators", out var separatorsArray))
-                        {
-                            separators = ((Array)separatorsArray)?.OfType<string>().ToArray();
-                        }
-
-                        if (attribute.Properties.TryGetValue("SplitOptions", out var splitOptionsObj))
-                        {
-                            splitOptions = (StringSplitOptions)splitOptionsObj;
-                        }
-                    }
-
                     items = text.Split(separators, splitOptions ^ trimOption);
                     // Compiler targets netstandard, so we need to emulate StringSplitOptions.TrimEntries, if it was requested.
                     if (splitOptions.HasFlag(trimOption))

src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlWellKnownTypes.cs

@@ -33,7 +33,6 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
         public IXamlType InheritDataTypeFromItemsAttribute { get; }
         public IXamlType MarkupExtensionOptionAttribute { get; }
         public IXamlType MarkupExtensionDefaultOptionAttribute { get; }
-        public IXamlType AvaloniaListAttribute { get; }
         public IXamlType AvaloniaList { get; }
         public IXamlType OnExtensionType { get; }
         public IXamlType UnsetValueType { get; }
@@ -143,7 +142,6 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
             InheritDataTypeFromItemsAttribute = cfg.TypeSystem.GetType("Avalonia.Metadata.InheritDataTypeFromItemsAttribute");
             MarkupExtensionOptionAttribute = cfg.TypeSystem.GetType("Avalonia.Metadata.MarkupExtensionOptionAttribute");
             MarkupExtensionDefaultOptionAttribute = cfg.TypeSystem.GetType("Avalonia.Metadata.MarkupExtensionDefaultOptionAttribute");
-            AvaloniaListAttribute = cfg.TypeSystem.GetType("Avalonia.Metadata.AvaloniaListAttribute");
             AvaloniaList = cfg.TypeSystem.GetType("Avalonia.Collections.AvaloniaList`1");
             OnExtensionType = cfg.TypeSystem.GetType("Avalonia.Markup.Xaml.MarkupExtensions.On");
             AvaloniaObjectBindMethod = AvaloniaObjectExtensions.FindMethod("Bind", IDisposable, false, AvaloniaObject,