feat: Add feature flag for the layout cycle fix

Author: dr1rrb

src/Uno.UI/FeatureConfiguration.cs

@@ -233,6 +233,15 @@ public static class FrameworkElement
 			/// will not, which is how WinUI behaves. Set to true if you have code written for earlier versions of Uno that relies upon the old behavior.
 			/// </summary>
 			public static bool UseLegacyHitTest { get; set; }
+
+#if __IOS__
+			/// <summary>
+			/// When true, propagate the NeedsLayout on superview even if element is in its LayoutSubViews() (i.e. Arrange()).
+			/// This is known to cause layout cycle when a child invalidates itself during arrange (e.g. ItemsRepeater).
+			/// Default value is false, set it to true will restore behavior of uno v4.7 and earlier.
+			/// </summary>
+			public static bool IOsAllowSuperviewNeedsLayoutWhileInLayoutSubViews { get; set; }
+#endif
 		}
 
 		public static class FrameworkTemplate

src/Uno.UI/UI/Xaml/FrameworkElement.iOS.cs

@@ -36,7 +36,7 @@ public override void SetNeedsLayout()
 
 			SetLayoutFlags(LayoutFlag.MeasureDirty | LayoutFlag.ArrangeDirty);
 
-			if (!_inLayoutSubviews)
+			if (FeatureConfiguration.FrameworkElement.IOsAllowSuperviewNeedsLayoutWhileInLayoutSubViews || !_inLayoutSubviews)
 			{
 				SetSuperviewNeedsLayout();
 			}