Revert "chore: [iOS] Remove unneeded workaround"

This reverts commit a2e5c9c.

src/Uno.UI/UI/Xaml/Controls/ListViewBase/ListViewBaseSource.iOS.cs

@@ -750,6 +750,7 @@ public override CGRect Frame
 			{
 				base.Frame = value;
 				UpdateContentViewFrame();
+				UpdateContentLayoutSlots(value);
 			}
 		}
 
@@ -766,6 +767,7 @@ public override CGRect Bounds
 				}
 				base.Bounds = value;
 				UpdateContentViewFrame();
+				UpdateContentLayoutSlots(Frame);
 			}
 		}
 
@@ -781,6 +783,20 @@ private void UpdateContentViewFrame()
 			}
 		}
 
+		/// <summary>
+		/// Fakely propagate the applied Frame of this internal container as the LayoutSlot of the publicly visible container.
+		/// This is required for the UIElement.TransformToVisual to work properly.
+		/// </summary>
+		private void UpdateContentLayoutSlots(Rect frame)
+		{
+			var content = Content;
+			if (content != null)
+			{
+				LayoutInformation.SetLayoutSlot(content, frame);
+				content.LayoutSlotWithMarginsAndAlignments = frame;
+			}
+		}
+
 		/// <summary>
 		/// Clear the cell's measured size, this allows the static template size to be updated with the correct databound size.
 		/// </summary>
@@ -918,6 +934,11 @@ public override void LayoutSubviews()
 			if (Content != null)
 			{
 				Layouter.ArrangeChild(Content, new Rect(0, 0, (float)size.Width, (float)size.Height));
+
+				// The item has to be arranged relative to this internal container (at 0,0),
+				// but doing this the LayoutSlot[WithMargins] has been updated, 
+				// so we fakely re-inject the relative position of the item in its parent.
+				UpdateContentLayoutSlots(Frame);
 			}
 		}