Rename and xmldoc `RealmResetEmptySet`

osu.Game/Database/DetachedBeatmapStore.cs

@@ -44,7 +44,7 @@ private void beatmapSetsChanged(IRealmCollection<BeatmapSetInfo> sender, ChangeS
         {
             if (changes == null)
             {
-                if (sender is EmptyRealmSet<BeatmapSetInfo>)
+                if (sender is RealmResetEmptySet<BeatmapSetInfo>)
                 {
                     // Usually we'd reset stuff here, but doing so triggers a silly flow which ends up deadlocking realm.
                     // Additionally, user should not be at song select when realm is blocking all operations in the first place.

osu.Game/Database/RealmAccess.cs

@@ -568,7 +568,7 @@ public IDisposable RegisterForNotifications<T>(Func<Realm, IQueryable<T>> query,
             lock (notificationsResetMap)
             {
                 // Store an action which is used when blocking to ensure consumers don't use results of a stale changeset firing.
-                notificationsResetMap.Add(action, () => callback(new EmptyRealmSet<T>(), null));
+                notificationsResetMap.Add(action, () => callback(new RealmResetEmptySet<T>(), null));
             }
 
             return RegisterCustomSubscription(action);

osu.Game/Database/RealmResetEmptySet.cs

@@ -12,7 +12,13 @@
 
 namespace osu.Game.Database
 {
-    public class EmptyRealmSet<T> : IRealmCollection<T>
+    /// <summary>
+    /// This can arrive in <see cref="RealmAccess.RegisterForNotifications{T}"/> callbacks to imply that realm access has been reset.
+    /// </summary>
+    /// <remarks>
+    /// Usually implies that the original database may return soon and the callback can usually be silently ignored.
+    ///</remarks>
+    public class RealmResetEmptySet<T> : IRealmCollection<T>
     {
         private IList<T> emptySet => Array.Empty<T>();