Update List internal classes to be sealed

src/DynamicData/List/Internal/AutoRefresh.cs

@@ -10,7 +10,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class AutoRefresh<TObject, TAny>(IObservable<IChangeSet<TObject>> source, Func<TObject, IObservable<TAny>> reEvaluator, TimeSpan? buffer = null, IScheduler? scheduler = null)
+internal sealed class AutoRefresh<TObject, TAny>(IObservable<IChangeSet<TObject>> source, Func<TObject, IObservable<TAny>> reEvaluator, TimeSpan? buffer = null, IScheduler? scheduler = null)
     where TObject : notnull
 {
     private readonly Func<TObject, IObservable<TAny>> _reEvaluator = reEvaluator ?? throw new ArgumentNullException(nameof(reEvaluator));

src/DynamicData/List/Internal/ChangeSetMergeTracker.cs

@@ -4,7 +4,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class ChangeSetMergeTracker<TObject>
+internal sealed class ChangeSetMergeTracker<TObject>
     where TObject : notnull
 {
     private readonly ChangeAwareList<TObject> _resultList = new();

src/DynamicData/List/Internal/ClonedListChangeSet.cs

@@ -6,7 +6,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class ClonedListChangeSet<TObject>
+internal sealed class ClonedListChangeSet<TObject>
     where TObject : notnull
 {
     public ClonedListChangeSet(IObservable<IChangeSet<TObject>> source, IEqualityComparer<TObject>? equalityComparer) =>

src/DynamicData/List/Internal/DeferUntilLoaded.cs

@@ -8,7 +8,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class DeferUntilLoaded<T>(IObservable<IChangeSet<T>> source)
+internal sealed class DeferUntilLoaded<T>(IObservable<IChangeSet<T>> source)
     where T : notnull
 {
     private readonly IObservable<IChangeSet<T>> _source = source ?? throw new ArgumentNullException(nameof(source));

src/DynamicData/List/Internal/EditDiff.cs

@@ -6,7 +6,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class EditDiff<T>(ISourceList<T> source, IEqualityComparer<T>? equalityComparer)
+internal sealed class EditDiff<T>(ISourceList<T> source, IEqualityComparer<T>? equalityComparer)
     where T : notnull
 {
     private readonly IEqualityComparer<T> _equalityComparer = equalityComparer ?? EqualityComparer<T>.Default;

src/DynamicData/List/Internal/Filter.cs

@@ -8,7 +8,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class Filter<T>
+internal sealed class Filter<T>
     where T : notnull
 {
     private readonly ListFilterPolicy _policy;

src/DynamicData/List/Internal/FilterOnObservable.cs

@@ -8,7 +8,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class FilterOnObservable<TObject>(IObservable<IChangeSet<TObject>> source, Func<TObject, IObservable<bool>> filter, TimeSpan? buffer = null, IScheduler? scheduler = null)
+internal sealed class FilterOnObservable<TObject>(IObservable<IChangeSet<TObject>> source, Func<TObject, IObservable<bool>> filter, TimeSpan? buffer = null, IScheduler? scheduler = null)
     where TObject : notnull
 {
     private readonly Func<TObject, IObservable<bool>> _filter = filter ?? throw new ArgumentNullException(nameof(filter));

src/DynamicData/List/Internal/FilterOnProperty.cs

@@ -9,7 +9,7 @@
 namespace DynamicData.List.Internal;
 
 [Obsolete("Use AutoRefresh(), followed by Filter() instead")]
-internal class FilterOnProperty<TObject, TProperty>(IObservable<IChangeSet<TObject>> source, Expression<Func<TObject, TProperty>> propertySelector, Func<TObject, bool> predicate, TimeSpan? throttle = null, IScheduler? scheduler = null)
+internal sealed class FilterOnProperty<TObject, TProperty>(IObservable<IChangeSet<TObject>> source, Expression<Func<TObject, TProperty>> propertySelector, Func<TObject, bool> predicate, TimeSpan? throttle = null, IScheduler? scheduler = null)
     where TObject : INotifyPropertyChanged
 {
     public IObservable<IChangeSet<TObject>> Run() => source.AutoRefresh(propertySelector, propertyChangeThrottle: throttle, scheduler: scheduler).Filter(predicate);

src/DynamicData/List/Internal/FilterStatic.cs

@@ -6,7 +6,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class FilterStatic<T>(IObservable<IChangeSet<T>> source, Func<T, bool> predicate)
+internal sealed class FilterStatic<T>(IObservable<IChangeSet<T>> source, Func<T, bool> predicate)
     where T : notnull
 {
     private readonly Func<T, bool> _predicate = predicate ?? throw new ArgumentNullException(nameof(predicate));

src/DynamicData/List/Internal/Group.cs

@@ -4,7 +4,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class Group<TObject, TGroup>(TGroup groupKey) : IGroup<TObject, TGroup>, IDisposable, IEquatable<Group<TObject, TGroup>>
+internal sealed class Group<TObject, TGroup>(TGroup groupKey) : IGroup<TObject, TGroup>, IDisposable, IEquatable<Group<TObject, TGroup>>
     where TObject : notnull
 {
     public TGroup GroupKey { get; } = groupKey;

src/DynamicData/List/Internal/MergeManyListChangeSets.cs

@@ -10,7 +10,7 @@ namespace DynamicData.List.Internal;
 /// <summary>
 /// Operator that is similiar to MergeMany but intelligently handles List ChangeSets.
 /// </summary>
-internal class MergeManyListChangeSets<TObject, TDestination>(IObservable<IChangeSet<TObject>> source, Func<TObject, IObservable<IChangeSet<TDestination>>> selector, IEqualityComparer<TDestination>? equalityComparer = null)
+internal sealed class MergeManyListChangeSets<TObject, TDestination>(IObservable<IChangeSet<TObject>> source, Func<TObject, IObservable<IChangeSet<TDestination>>> selector, IEqualityComparer<TDestination>? equalityComparer = null)
     where TObject : notnull
     where TDestination : notnull
 {

src/DynamicData/List/Internal/Pager.cs

@@ -7,7 +7,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class Pager<T>(IObservable<IChangeSet<T>> source, IObservable<IPageRequest> requests)
+internal sealed class Pager<T>(IObservable<IChangeSet<T>> source, IObservable<IPageRequest> requests)
     where T : notnull
 {
     private readonly IObservable<IPageRequest> _requests = requests ?? throw new ArgumentNullException(nameof(requests));

src/DynamicData/List/Internal/QueryWhenChanged.cs

@@ -8,7 +8,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class QueryWhenChanged<T>(IObservable<IChangeSet<T>> source)
+internal sealed class QueryWhenChanged<T>(IObservable<IChangeSet<T>> source)
     where T : notnull
 {
     private readonly IObservable<IChangeSet<T>> _source = source ?? throw new ArgumentNullException(nameof(source));

src/DynamicData/List/Internal/RefCount.cs

@@ -7,7 +7,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class RefCount<T>(IObservable<IChangeSet<T>> source)
+internal sealed class RefCount<T>(IObservable<IChangeSet<T>> source)
     where T : notnull
 {
     private readonly object _locker = new();

src/DynamicData/List/Internal/ReferenceCountTracker.cs

@@ -9,7 +9,7 @@ namespace DynamicData.List.Internal;
 /// <para>Thanks dudes.</para>
 /// </summary>
 /// <typeparam name="T">The type of the item.</typeparam>
-internal class ReferenceCountTracker<T>
+internal sealed class ReferenceCountTracker<T>
     where T : notnull
 {
     public IEnumerable<T> Items => ReferenceCounts.Keys;

src/DynamicData/List/Internal/ToObservableChangeSet.cs

@@ -9,7 +9,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class ToObservableChangeSet<TObject>
+internal sealed class ToObservableChangeSet<TObject>
     where TObject : notnull
 {
     private readonly Func<TObject, TimeSpan?>? _expireAfter;

src/DynamicData/List/Internal/TransformAsync.cs

@@ -7,7 +7,7 @@
 
 namespace DynamicData.List.Internal;
 
-internal class TransformAsync<TSource, TDestination>
+internal sealed class TransformAsync<TSource, TDestination>
     where TSource : notnull
     where TDestination : notnull
 {