Move ScrollInfoView into ItemsControl. (#14538)

Fixes #14524

src/Avalonia.Controls/ItemsControl.cs

@@ -298,6 +298,18 @@ namespace Avalonia.Controls
         /// </summary>
         public IEnumerable<Control> GetRealizedContainers() => Presenter?.GetRealizedContainers() ?? Array.Empty<Control>();
 
+        /// <summary>
+        /// Scrolls the specified item into view.
+        /// </summary>
+        /// <param name="index">The index of the item.</param>
+        public void ScrollIntoView(int index) => Presenter?.ScrollIntoView(index);
+
+        /// <summary>
+        /// Scrolls the specified item into view.
+        /// </summary>
+        /// <param name="item">The item.</param>
+        public void ScrollIntoView(object item) => ScrollIntoView(ItemsView.IndexOf(item));
+
         /// <summary>
         /// Returns the <see cref="ItemsControl"/> that owns the specified container control.
         /// </summary>

src/Avalonia.Controls/Primitives/SelectingItemsControl.cs

@@ -409,18 +409,6 @@ namespace Avalonia.Controls.Primitives
             EndUpdating();
         }
 
-        /// <summary>
-        /// Scrolls the specified item into view.
-        /// </summary>
-        /// <param name="index">The index of the item.</param>
-        public void ScrollIntoView(int index) => Presenter?.ScrollIntoView(index);
-
-        /// <summary>
-        /// Scrolls the specified item into view.
-        /// </summary>
-        /// <param name="item">The item.</param>
-        public void ScrollIntoView(object item) => ScrollIntoView(ItemsView.IndexOf(item));
-
         /// <summary>
         /// Gets the value of the <see cref="IsSelectedProperty"/> on the specified control.
         /// </summary>