Add compatibility hack for older compiled bindings.

Previously, `CompiledBindingPathBuilder` didn't have a `TemplatedParent` method and instead the XAML compiler rewrite templated parent bindings to be a `$self.TemplateParent` property binding. resulting in extraneous logs.

Add a constructor with an  `apiVersion`  to `CompiledBindingPathBuilder` which will be used by newer versions of the XAML compiler, and if a usage is detected using an `apiVersion` of 0, then upgrade `$self.TemplatedParent` to use a `TemplatedParentPathElement`.

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

@@ -900,8 +900,14 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions
 
             public XamlILNodeEmitResult Emit(XamlIlEmitContext context, IXamlILEmitter codeGen)
             {
+                var intType = context.Configuration.TypeSystem.GetType("System.Int32");
                 var types = context.GetAvaloniaTypes();
-                codeGen.Newobj(types.CompiledBindingPathBuilder.FindConstructor());
+
+                // We're calling the CompiledBindingPathBuilder(int apiVersion) with an apiVersion 
+                // of 1 to indicate that we don't want TemplatedParent compatibility hacks enabled.
+                codeGen
+                    .Ldc_I4(1)
+                    .Newobj(types.CompiledBindingPathBuilder.FindConstructor(new() { intType }));
 
                 foreach (var transform in _transformElements)
                 {

src/Markup/Avalonia.Markup.Xaml/MarkupExtensions/CompiledBindings/CompiledBindingPath.cs

@@ -107,9 +107,18 @@ namespace Avalonia.Markup.Xaml.MarkupExtensions.CompiledBindings
 
     public class CompiledBindingPathBuilder
     {
+        private readonly int _apiVersion;
         private object? _rawSource;
         private readonly List<ICompiledBindingPathElement> _elements = new();
 
+        public CompiledBindingPathBuilder()
+        {
+        }
+
+        // TODO12: Remove this constructor. apiVersion is only needed for compatibility with
+        // versions of Avalonia which used $self.Property() for building TemplatedParent bindings.
+        public CompiledBindingPathBuilder(int apiVersion) => _apiVersion = apiVersion;
+
         public CompiledBindingPathBuilder Not()
         {
             _elements.Add(new NotExpressionPathElement());
@@ -118,7 +127,21 @@ namespace Avalonia.Markup.Xaml.MarkupExtensions.CompiledBindings
 
         public CompiledBindingPathBuilder Property(IPropertyInfo info, Func<WeakReference<object?>, IPropertyInfo, IPropertyAccessor> accessorFactory)
         {
-            _elements.Add(new PropertyElement(info, accessorFactory, _elements.Count == 0));
+            // Older versions of Avalonia used $self.Property() for building TemplatedParent bindings.
+            // Try to detect this and upgrade to using a TemplatedParentPathElement so that logging works
+            // correctly.
+            if (_apiVersion == 0 && 
+                info.Name == "TemplatedParent" && 
+                _elements.Count >= 1 &&
+                _elements[_elements.Count - 1] is SelfPathElement)
+            {
+                _elements.Add(new TemplatedParentPathElement());
+            }
+            else
+            {
+                _elements.Add(new PropertyElement(info, accessorFactory, _elements.Count == 0));
+            }
+
             return this;
         }