sealed some internal classes in Controls.Core that are not inherited from (1)

src/Controls/src/Core/AnimatableKey.cs

@@ -4,7 +4,7 @@
 
 namespace Microsoft.Maui.Controls
 {
-	internal class AnimatableKey
+	internal sealed class AnimatableKey
 	{
 		public AnimatableKey(IAnimatable animatable, string handle)
 		{
@@ -87,7 +87,7 @@ public override int GetHashCode()
 			}
 		}
 
-		protected bool Equals(AnimatableKey other)
+		private bool Equals(AnimatableKey other)
 		{
 			if (!string.Equals(Handle, other.Handle, StringComparison.Ordinal))
 			{

src/Controls/src/Core/BindableObject.cs

@@ -163,7 +163,7 @@ public object GetValue(BindableProperty property)
 
 		internal LocalValueEnumerator GetLocalValueEnumerator() => new LocalValueEnumerator(this);
 
-		internal class LocalValueEnumerator : IEnumerator<LocalValueEntry>
+		internal sealed class LocalValueEnumerator : IEnumerator<LocalValueEntry>
 		{
 			Dictionary<BindableProperty, BindablePropertyContext>.Enumerator _propertiesEnumerator;
 			internal LocalValueEnumerator(BindableObject bindableObject) => _propertiesEnumerator = bindableObject._properties.GetEnumerator();
@@ -190,7 +190,7 @@ void IEnumerator.Reset()
 			}
 		}
 
-		internal class LocalValueEntry
+		internal sealed class LocalValueEntry
 		{
 			internal LocalValueEntry(BindableProperty property, object value, BindableContextAttributes attributes)
 			{
@@ -779,7 +779,7 @@ internal enum BindableContextAttributes
 			IsDefaultValueCreated = 1 << 5,
 		}
 
-		internal class BindablePropertyContext
+		internal sealed class BindablePropertyContext
 		{
 			public BindableContextAttributes Attributes;
 
@@ -801,7 +801,7 @@ internal enum SetValuePrivateFlags
 			Default = None
 		}
 
-		internal class SetValueArgs
+		internal sealed class SetValueArgs
 		{
 			public readonly SetValueFlags Attributes;
 			public readonly BindablePropertyContext Context;

src/Controls/src/Core/BindingExpression.cs

@@ -12,7 +12,7 @@
 
 namespace Microsoft.Maui.Controls
 {
-	internal class BindingExpression
+	internal sealed class BindingExpression
 	{
 		internal const string PropertyNotFoundErrorMessage = "'{0}' property not found on '{1}', target property: '{2}.{3}'";
 		internal const string CannotConvertTypeErrorMessage = "'{0}' cannot be converted to type '{1}'";
@@ -591,7 +591,7 @@ void OnElementParentSet(object sender, EventArgs e)
 			}
 		}
 
-		class BindingPair
+		private sealed class BindingPair
 		{
 			public BindingPair(BindingExpressionPart part, object source, bool isLast)
 			{
@@ -607,7 +607,7 @@ public BindingPair(BindingExpressionPart part, object source, bool isLast)
 			public object Source { get; private set; }
 		}
 
-		internal class WeakPropertyChangedProxy : WeakEventProxy<INotifyPropertyChanged, PropertyChangedEventHandler>
+		internal sealed class WeakPropertyChangedProxy : WeakEventProxy<INotifyPropertyChanged, PropertyChangedEventHandler>
 		{
 			public WeakPropertyChangedProxy() { }
 
@@ -651,7 +651,7 @@ void OnBCChanged(object sender, EventArgs e)
 			}
 		}
 
-		class BindingExpressionPart
+		private sealed class BindingExpressionPart
 		{
 			readonly BindingExpression _expression;
 			readonly PropertyChangedEventHandler _changeHandler;

src/Controls/src/Core/CastingEnumerator.cs

@@ -4,7 +4,7 @@
 
 namespace Microsoft.Maui.Controls
 {
-	internal class CastingEnumerator<T, TFrom> : IEnumerator<T> where T : class where TFrom : class
+	internal sealed class CastingEnumerator<T, TFrom> : IEnumerator<T> where T : class where TFrom : class
 	{
 		readonly IEnumerator<TFrom> _enumerator;
 

src/Controls/src/Core/Compatibility/Android/ResourcesProvider.cs

@@ -8,7 +8,7 @@
 namespace Microsoft.Maui.Controls.Compatibility.Platform.Android
 {
 	[Obsolete]
-	internal class ResourcesProvider : ISystemResourcesProvider
+	internal sealed class ResourcesProvider : ISystemResourcesProvider
 	{
 		ResourceDictionary _dictionary;
 		static global::Android.Content.Context _applicationContext;

src/Controls/src/Core/Compatibility/Handlers/ListView/Android/ConditionalFocusLayout.cs

@@ -5,7 +5,7 @@
 
 namespace Microsoft.Maui.Controls.Handlers.Compatibility
 {
-	internal class ConditionalFocusLayout : LinearLayout, global::Android.Views.View.IOnTouchListener
+	internal sealed class ConditionalFocusLayout : LinearLayout, global::Android.Views.View.IOnTouchListener
 	{
 		public ConditionalFocusLayout(System.IntPtr p, global::Android.Runtime.JniHandleOwnership o) : base(p, o)
 		{

src/Controls/src/Core/Compatibility/Handlers/ListView/Android/GroupedListViewAdapter.cs

@@ -9,9 +9,9 @@
 namespace Microsoft.Maui.Controls.Handlers.Compatibility
 {
 
-	internal class GroupedListViewAdapter : ListViewAdapter, ISectionIndexer
+	internal sealed class GroupedListViewAdapter : ListViewAdapter, ISectionIndexer
 	{
-		class SectionData
+		private sealed class SectionData
 		{
 			public int Index { get; set; }
 			public int Length { get; set; }

src/Controls/src/Core/Compatibility/Handlers/ListView/Android/ListViewRenderer.cs

@@ -552,7 +552,7 @@ void UpdateVerticalScrollBarVisibility()
 			Control.VerticalScrollBarEnabled = newVerticalScrollVisibility == ScrollBarVisibility.Always;
 		}
 
-		internal class Container : ViewGroup
+		internal sealed class Container : ViewGroup
 		{
 			IPlatformViewHandler _child;
 

src/Controls/src/Core/Compatibility/Handlers/ListView/Android/TextCellRenderer.cs

@@ -90,7 +90,7 @@ void UpdateMainText()
 		}
 
 		// ensure we don't get other people's BaseCellView's
-		internal class TextCellView : BaseCellView
+		internal sealed class TextCellView : BaseCellView
 		{
 			public TextCellView(Context context, Cell cell) : base(context, cell)
 			{

src/Controls/src/Core/Compatibility/Handlers/iOS/KeyboardInsetTracker.cs

@@ -8,7 +8,7 @@
 namespace Microsoft.Maui.Controls.Handlers.Compatibility
 {
 	[Obsolete("Scrolling is now handled by KeyboardAutoManagerScroll.")]
-	internal class KeyboardInsetTracker : IDisposable
+	internal sealed class KeyboardInsetTracker : IDisposable
 	{
 		readonly Func<UIWindow> _fetchWindow;
 		readonly Action<PointF> _setContentOffset;