#18192 Fix Implicit x:DataType defining for InheritDataTypeFromItems attributed property (#18206)

Co-authored-by: Julien Lebosquain <julien@lebosquain.net>

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

@@ -92,7 +92,7 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
                             && type is IXamlType xamlType)
                         {
                             parentObject = context.ParentNodes().OfType<XamlAstConstructableObjectNode>()
-                                .FirstOrDefault(n => n.Type.GetClrType().FullName == xamlType.FullName);
+                                .FirstOrDefault(n => xamlType.IsAssignableFrom(n.Type.GetClrType()));
                         }
                         else
                         {

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

@@ -608,7 +608,45 @@ namespace Avalonia.Markup.Xaml.UnitTests.MarkupExtensions
                 Assert.Equal(dataContext.ListProperty[0], (string?)((ContentPresenter)target.Presenter.Panel!.Children[0]).Content);
             }
         }
-        
+
+        [Fact]
+        public void InfersDataTypeFromParentDataGridItemsTypeInCaseOfControlInheritance()
+        {
+            using (UnitTestApplication.Start(TestServices.StyledWindow))
+            {
+                var window = (Window)AvaloniaRuntimeXamlLoader.Load(@"
+<Window xmlns='https://github.com/avaloniaui'
+        xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
+        xmlns:local='clr-namespace:Avalonia.Markup.Xaml.UnitTests.MarkupExtensions;assembly=Avalonia.Markup.Xaml.UnitTests'
+        x:DataType='local:TestItemsCollectionDataContext'>
+    <local:DataGridLikeControlInheritor Items='{CompiledBinding Items}' Name='target'>
+        <local:DataGridLikeControlInheritor.Columns>
+            <local:DataGridLikeColumn Binding='{CompiledBinding StringProperty}'>
+            </local:DataGridLikeColumn>
+        </local:DataGridLikeControlInheritor.Columns>
+    </local:DataGridLikeControlInheritor>
+</Window>");
+                var target = window.GetControl<DataGridLikeControl>("target");
+                var column = target.Columns.Single();
+
+                var dataContext = new TestItemsCollectionDataContext();
+
+                dataContext.Items.Add(new TestData() { StringProperty = "Test" });
+
+                window.DataContext = dataContext;
+
+                window.ApplyTemplate();
+                target.ApplyTemplate();
+
+                // Assert DataGridLikeColumn.Binding data type.
+                var compiledPath = ((CompiledBindingExtension)column.Binding!).Path;
+                var node = Assert.IsType<PropertyElement>(Assert.Single(compiledPath.Elements));
+
+                Assert.Equal(typeof(string), node.Property.PropertyType);
+                Assert.Equal(nameof(TestData.StringProperty), node.Property.Name);
+            }
+        }
+
         [Fact]
         public void InfersDataTemplateTypeFromParentDataGridItemsType()
         {
@@ -2239,6 +2277,11 @@ namespace Avalonia.Markup.Xaml.UnitTests.MarkupExtensions
 
     public class TestDataContextBaseClass {}
     
+    public class TestItemsCollectionDataContext : TestDataContextBaseClass
+    {
+        public ObservableCollection<TestData> Items { get; } = new ObservableCollection<TestData>();
+    }
+
     public class TestDataContext : TestDataContextBaseClass, IHasPropertyDerived, IHasExplicitProperty
     {
         public bool BoolProperty { get; set; }
@@ -2391,6 +2434,9 @@ namespace Avalonia.Markup.Xaml.UnitTests.MarkupExtensions
         public IDataTemplate? Template { get; set; }
     }
 
+    public class DataGridLikeControlInheritor : DataGridLikeControl
+    { }
+
     public class ImplicitConvertible
     {
         public ImplicitConvertible(string value) => Value = value;