test: Translation should be applied after Loaded

src/Uno.UI.RuntimeTests/Tests/Windows_UI_Xaml/Given_UIElement.cs

@@ -1566,6 +1566,28 @@ public async Task When_Element_Has_Translation_And_Visual_Has_Offset()
 		}
 #endif
 
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_Translation_On_Load()
+		{
+			var sut = new Rectangle()
+			{
+				Width = 100,
+				Height = 100,
+				Fill = new SolidColorBrush(Microsoft.UI.Colors.Blue),
+			};
+			var canvas = new Canvas();
+			canvas.Width = 200;
+			canvas.Height = 200;
+			canvas.Children.Add(sut);
+			TestServices.WindowHelper.WindowContent = canvas;
+			await TestServices.WindowHelper.WaitForLoaded(sut);
+			sut.Translation += new Vector3(200, 0, 128);
+			await TestServices.WindowHelper.WaitForIdle();
+			var bitmap = await UITestHelper.ScreenShot(canvas);
+			ImageAssert.DoesNotHaveColorAt(bitmap, new Windows.Foundation.Point(50, 50), Microsoft.UI.Colors.Blue, tolerance: 25);
+		}
+
 #if HAS_UNO
 		[TestMethod]
 		[RunsOnUIThread]