Added failing test for #2535.

tests/Avalonia.Visuals.UnitTests/VisualExtensionsTests.cs

@@ -0,0 +1,38 @@
+using Avalonia.Controls;
+using Avalonia.Layout;
+using Avalonia.Media;
+using Avalonia.UnitTests;
+using Xunit;
+
+namespace Avalonia.Visuals.UnitTests
+{
+    public class VisualExtensionsTests
+    {
+        [Fact]
+        public void TranslatePoint_Should_Respect_RenderTransforms()
+        {
+            Border target;
+            var root = new TestRoot
+            {
+                Width = 100,
+                Height = 100,
+                Child = new Decorator
+                {
+                    Width = 50,
+                    Height = 50,
+                    HorizontalAlignment = HorizontalAlignment.Center,
+                    VerticalAlignment = VerticalAlignment.Center,
+                    RenderTransform = new TranslateTransform(25, 25),
+                    Child = target = new Border(),
+                }
+            };
+
+            root.Measure(Size.Infinity);
+            root.Arrange(new Rect(root.DesiredSize));
+
+            var result = target.TranslatePoint(new Point(0, 0), root);
+
+            Assert.Equal(new Point(50, 50), result);
+        }
+    }
+}