refactor: drop RenderTargetBitmap.RenderSync

src/Uno.UI/UI/Xaml/Media/Imaging/RenderTargetBitmap.skia.cs

@@ -83,21 +83,6 @@ private static ImageData Open(UnmanagedArrayOfBytes buffer, int bufferLength, in
 			}
 		}
 
-		/// <summary>
-		/// Renders synchronously on the UI thread using the software rasterizer. For internal
-		/// callers that cannot yield to the dispatcher — e.g. the drag visual must be captured
-		/// within the DragStarting sequence so DragEnter/DragOver still fire synchronously right
-		/// after it, matching WinUI. Must not be called while a RenderAsync is in flight on the
-		/// same instance.
-		/// </summary>
-		internal void RenderSync(UIElement element, int scaledWidth, int scaledHeight)
-		{
-			(_bufferSize, PixelWidth, PixelHeight) = PrepareRender(element, new Size(scaledWidth, scaledHeight)) is { } render
-				? RenderSoftware(element.Visual, render)
-				: (0, 0, 0);
-			InvalidateSource();
-		}
-
 		/// <summary>
 		/// Computes the render dimensions and sizes the pixel buffer accordingly; null when the
 		/// element has nothing to render.

src/Uno.UI/UI/Xaml/UIElement.Pointers.cs

@@ -969,14 +969,11 @@ private async Task<DataPackageOperation> StartDragAsyncCore(PointerPoint pointer
 				//		 so we provide the ActualSize to request the image to be scaled back in logical pixels.
 
 				var target = new RenderTargetBitmap();
-#if __SKIA__
-				// RenderAsync completes during a later render pass; the drag visual must instead be
-				// captured without yielding so DragStarted/DragEnter below still fire synchronously
-				// within the DragStarting sequence (matching WinUI).
-				target.RenderSync(this, (int)ActualSize.X, (int)ActualSize.Y);
-#else
-				await target.RenderAsync(this, (int)ActualSize.X, (int)ActualSize.Y);
-#endif
+				// Deliberately not awaited: on Skia the render completes during a later render pass,
+				// and yielding here would break the synchronous DragStarting → DragStarted →
+				// DragEnter/DragOver sequence (matching WinUI). The drag view redraws itself when
+				// the bitmap's pixels arrive (InvalidateSource).
+				_ = target.RenderAsync(this, (int)ActualSize.X, (int)ActualSize.Y);
 
 				routedArgs.DragUI.Content = target;
 				routedArgs.DragUI.Anchor = -ptPosition;