Fix ElementName binding inside of control template

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

@@ -374,6 +374,12 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions
 
             public static IXamlType GetTargetType(IXamlAstNode namescopeRoot, string name)
             {
+                // If we start from the nested scope - skip it.
+                if (namescopeRoot is NestedScopeMetadataNode scope)
+                {
+                    namescopeRoot = scope.Value;
+                }
+                
                 var finder = new ScopeRegistrationFinder(name);
                 namescopeRoot.Visit(finder);
                 return finder.TargetType;
@@ -399,6 +405,7 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions
 
             IXamlAstNode IXamlAstVisitor.Visit(IXamlAstNode node)
             {
+                // Ignore name registrations, if we are inside of the nested namescope.
                 if (_childScopesStack.Count == 0 && node is AvaloniaNameScopeRegistrationXamlIlNode registration)
                 {
                     if (registration.Name is XamlAstTextNode text && text.Text == Name)

tests/Avalonia.Markup.Xaml.UnitTests/MarkupExtensions/CompiledBindingExtensionTests.cs

@@ -641,6 +641,38 @@ namespace Avalonia.Markup.Xaml.UnitTests.MarkupExtensions
             }
         }
 
+        
+        [Fact]
+        public void ResolvesElementNameInTemplate()
+        {
+            using (UnitTestApplication.Start(TestServices.StyledWindow))
+            {
+                var xaml = @"
+<ContentControl xmlns='https://github.com/avaloniaui'
+                Content='Hello'>
+    <ContentControl.Styles>
+        <Style Selector='ContentControl'>
+            <Setter Property='Template'>
+                <ControlTemplate>
+                    <Panel>
+                        <TextBox Name='InnerTextBox' Text='Hello' />
+                        <ContentPresenter Content='{CompiledBinding Text, ElementName=InnerTextBox}' />
+                    </Panel>
+                </ControlTemplate>
+            </Setter>
+        </Style>
+    </ContentControl.Styles>
+</ContentControl>";
+
+                var contentControl = AvaloniaRuntimeXamlLoader.Parse<ContentControl>(xaml);
+                contentControl.Measure(new Size(10, 10));
+                
+                var result = contentControl.GetTemplateChildren().OfType<ContentPresenter>().First();
+                
+                Assert.Equal("Hello", result.Content);
+            }
+        }
+        
         [Fact]
         public void Binds_To_Source()
         {