Merge pull request #8260 from unoplatform/dev/dr/andReorderFlicker

fix(listview): Fix flickering when reordering items on Android

src/Uno.UI/FeatureConfiguration.cs

@@ -326,6 +326,15 @@ public static class NativeListViewBase
 			/// from crashing when pressured: Tmp detached view should be removed from RecyclerView before it can be recycled
 			/// </summary>
 			public static bool RemoveItemAnimator = true;
+
+			/// <summary>
+			/// Indicates if a full recycling pass should be achieved on drop (re-order) on a ListView instead of a simple layout pass.
+			/// </summary>
+			/// <remarks>
+			/// This flag should be kept to 'false' if you turned <see cref="RemoveItemAnimator"/> to 'false'.
+			/// Forcing a recycling pass with ItemAnimator is known to cause a flicker of the whole list.
+			/// </remarks>
+			public static bool ForceRecycleOnDrop = false;
 		}
 #endif
 

src/Uno.UI/UI/Xaml/Controls/ListViewBase/VirtualizingPanelLayout.Android.cs

@@ -2240,9 +2240,18 @@ internal void CleanupReordering()
 			_pendingReorder = null;
 
 			ViewCache.RemoveReorderingItem();
-			// We need a full refresh to properly re-arrange all items at their right location,
-			// ignoring the temp location of the dragged / reordered item.
-			RecycleLayout();
+
+			if (FeatureConfiguration.NativeListViewBase.ForceRecycleOnDrop)
+			{
+				// We need a full refresh to properly re-arrange all items at their right location,
+				// ignoring the temp location of the dragged / reordered item.
+				// Since https://github.com/unoplatform/uno/pull/8227 a full recycle pass seems to be no longer required.
+				RecycleLayout();
+			}
+			else
+			{
+				RequestLayout();
+			}
 		}
 
 		protected bool ShouldInsertReorderingView(GeneratorDirection direction, double physicalExtentOffset)