LightlessSync/PlayerData/Pairs/IPairHandlerAdapter.cs

@@ -25,6 +25,8 @@ public interface IPairHandlerAdapter : IDisposable, IPairPerformanceSubject
         bool IsDownloading { get; }
         int PendingDownloadCount { get; }
         int ForbiddenDownloadCount { get; }
+        DateTime? InvisibleSinceUtc { get; }
+        DateTime? VisibilityEvictionDueAtUtc { get; }
 
     void Initialize();
         void ApplyData(CharacterData data);

LightlessSync/PlayerData/Pairs/Pair.cs

@@ -194,9 +194,13 @@ public class Pair
     {
         var handler = TryGetHandler();
         if (handler is null)
-        {
             return PairDebugInfo.Empty;
-        }
+
+        var now = DateTime.UtcNow;
+        var dueAt = handler.VisibilityEvictionDueAtUtc;
+        var remainingSeconds = dueAt.HasValue
+            ? Math.Max(0, (dueAt.Value - now).TotalSeconds)
+            : (double?)null;
 
         return new PairDebugInfo(
             true,
@@ -206,6 +210,9 @@ public class Pair
             handler.LastDataReceivedAt,
             handler.LastApplyAttemptAt,
             handler.LastSuccessfulApplyAt,
+            handler.InvisibleSinceUtc,
+            handler.VisibilityEvictionDueAtUtc,
+            remainingSeconds,
             handler.LastFailureReason,
             handler.LastBlockingConditions,
             handler.IsApplying,

LightlessSync/PlayerData/Pairs/PairDebugInfo.cs

@@ -8,6 +8,9 @@ public sealed record PairDebugInfo(
     DateTime? LastDataReceivedAt,
     DateTime? LastApplyAttemptAt,
     DateTime? LastSuccessfulApplyAt,
+    DateTime? InvisibleSinceUtc,
+    DateTime? VisibilityEvictionDueAtUtc,
+    double? VisibilityEvictionRemainingSeconds,
     string? LastFailureReason,
     IReadOnlyList<string> BlockingConditions,
     bool IsApplying,
@@ -24,6 +27,9 @@ public sealed record PairDebugInfo(
         null,
         null,
         null,
+        null,
+        null,
+        null,
         Array.Empty<string>(),
         false,
         false,

LightlessSync/PlayerData/Pairs/PairHandlerAdapter.cs

@@ -70,7 +70,14 @@ internal sealed class PairHandlerAdapter : DisposableMediatorSubscriberBase, IPa
     private DateTime? _lastSuccessfulApplyAt;
     private string? _lastFailureReason;
     private IReadOnlyList<string> _lastBlockingConditions = Array.Empty<string>();
+    private readonly object _visibilityGraceGate = new();
+    private CancellationTokenSource? _visibilityGraceCts;
+    private static readonly TimeSpan VisibilityEvictionGrace = TimeSpan.FromMinutes(1);
+    private DateTime? _invisibleSinceUtc;
+    private DateTime? _visibilityEvictionDueAtUtc;
 
+    public DateTime? InvisibleSinceUtc => _invisibleSinceUtc;
+    public DateTime? VisibilityEvictionDueAtUtc => _visibilityEvictionDueAtUtc;
     public string Ident { get; }
     public bool Initialized { get; private set; }
     public bool ScheduledForDeletion { get; set; }
@@ -80,18 +87,32 @@ internal sealed class PairHandlerAdapter : DisposableMediatorSubscriberBase, IPa
         get => _isVisible;
         private set
         {
-            if (_isVisible != value)
+            if (_isVisible == value) return;
-            {
+
             _isVisible = value;
+
             if (!_isVisible)
             {
                 DisableSync();
-                    ResetPenumbraCollection(reason: "VisibilityLost");
+
+                _invisibleSinceUtc = DateTime.UtcNow;
+                _visibilityEvictionDueAtUtc = _invisibleSinceUtc.Value.Add(VisibilityEvictionGrace);
+
+                StartVisibilityGraceTask();
             }
-                else if (_charaHandler is not null && _charaHandler.Address != nint.Zero)
+            else
             {
+                CancelVisibilityGraceTask();
+
+                _invisibleSinceUtc = null;
+                _visibilityEvictionDueAtUtc = null;
+
+                ScheduledForDeletion = false;
+
+                if (_charaHandler is not null && _charaHandler.Address != nint.Zero)
                     _ = EnsurePenumbraCollection();
             }
+
             var user = GetPrimaryUserData();
             Mediator.Publish(new EventMessage(new Event(PlayerName, user, nameof(PairHandlerAdapter),
                 EventSeverity.Informational, "User Visibility Changed, now: " + (_isVisible ? "Is Visible" : "Is not Visible"))));
@@ -99,7 +120,6 @@ internal sealed class PairHandlerAdapter : DisposableMediatorSubscriberBase, IPa
             Mediator.Publish(new VisibilityChange());
         }
     }
-    }
 
     public long LastAppliedDataBytes { get; private set; }
     public long LastAppliedDataTris { get; set; } = -1;
@@ -918,6 +938,46 @@ internal sealed class PairHandlerAdapter : DisposableMediatorSubscriberBase, IPa
         }
     }
 
+    private void CancelVisibilityGraceTask()
+    {
+        lock (_visibilityGraceGate)
+        {
+            _visibilityGraceCts?.CancelDispose();
+            _visibilityGraceCts = null;
+        }
+    }
+
+    private void StartVisibilityGraceTask()
+    {
+        CancellationToken token;
+        lock (_visibilityGraceGate)
+        {
+            _visibilityGraceCts = _visibilityGraceCts?.CancelRecreate() ?? new CancellationTokenSource();
+            token = _visibilityGraceCts.Token;
+        }
+
+        _visibilityGraceTask = Task.Run(async () =>
+        {
+            try
+            {
+                await Task.Delay(VisibilityEvictionGrace, token).ConfigureAwait(false);
+                token.ThrowIfCancellationRequested();
+                if (IsVisible) return;
+
+                ScheduledForDeletion = true;
+                ResetPenumbraCollection(reason: "VisibilityLostTimeout");
+            }
+            catch (OperationCanceledException)
+            {
+                // operation cancelled, do nothing
+            }
+            catch (Exception ex)
+            {
+                Logger.LogDebug(ex, "Visibility grace task failed for {handler}", GetLogIdentifier());
+            }
+        }, CancellationToken.None);
+    }
+
     protected override void Dispose(bool disposing)
     {
         base.Dispose(disposing);
@@ -936,7 +996,10 @@ internal sealed class PairHandlerAdapter : DisposableMediatorSubscriberBase, IPa
             _downloadCancellationTokenSource = null;
             _downloadManager.Dispose();
             _charaHandler?.Dispose();
+            CancelVisibilityGraceTask();
             _charaHandler = null;
+            _invisibleSinceUtc = null;
+            _visibilityEvictionDueAtUtc = null;
 
             if (!string.IsNullOrEmpty(name))
             {
@@ -1265,6 +1328,7 @@ internal sealed class PairHandlerAdapter : DisposableMediatorSubscriberBase, IPa
     }
 
     private Task? _pairDownloadTask;
+    private Task _visibilityGraceTask;
 
     private async Task DownloadAndApplyCharacterAsync(Guid applicationBase, CharacterData charaData, Dictionary<ObjectKind, HashSet<PlayerChanges>> updatedData,
         bool updateModdedPaths, bool updateManip, Dictionary<(string GamePath, string? Hash), string>? cachedModdedPaths, CancellationToken downloadToken)

LightlessSync/PlayerData/Pairs/PairHandlerRegistry.cs

@@ -11,7 +11,9 @@ public sealed class PairHandlerRegistry : IDisposable
 {
     private readonly object _gate = new();
     private readonly object _pendingGate = new();
+    private readonly object _visibilityGate = new();
     private readonly Dictionary<string, PairHandlerEntry> _entriesByIdent = new(StringComparer.Ordinal);
+    private readonly Dictionary<string, CancellationTokenSource> _pendingInvisibleEvictions = new(StringComparer.Ordinal);
     private readonly Dictionary<IPairHandlerAdapter, PairHandlerEntry> _entriesByHandler = new(ReferenceEqualityComparer.Instance);
 
     private readonly IPairHandlerAdapterFactory _handlerFactory;
@@ -144,6 +146,37 @@ public sealed class PairHandlerRegistry : IDisposable
         return PairOperationResult<PairUniqueIdentifier>.Ok(registration.PairIdent);
     }
 
+    private PairOperationResult CancelAllInvisibleEvictions()
+    {
+        List<CancellationTokenSource> snapshot;
+        lock (_visibilityGate)
+        {
+            snapshot = [.. _pendingInvisibleEvictions.Values];
+            _pendingInvisibleEvictions.Clear();
+        }
+
+        List<string>? errors = null;
+
+        foreach (var cts in snapshot)
+        {
+            try { cts.Cancel(); }
+            catch (Exception ex)
+            {
+                (errors ??= new List<string>()).Add($"Cancel: {ex.Message}");
+            }
+
+            try { cts.Dispose(); }
+            catch (Exception ex)
+            {
+                (errors ??= new List<string>()).Add($"Dispose: {ex.Message}");
+            }
+        }
+
+        return errors is null
+            ? PairOperationResult.Ok()
+            : PairOperationResult.Fail($"CancelAllInvisibleEvictions had error(s): {string.Join(" | ", errors)}");
+    }
+
     public PairOperationResult ApplyCharacterData(PairRegistration registration, OnlineUserCharaDataDto dto)
     {
         if (registration.CharacterIdent is null)
@@ -300,6 +333,7 @@ public sealed class PairHandlerRegistry : IDisposable
         lock (_gate)
         {
             handlers = _entriesByHandler.Keys.ToList();
+            CancelAllInvisibleEvictions();
             _entriesByIdent.Clear();
             _entriesByHandler.Clear();
         }
@@ -332,6 +366,7 @@ public sealed class PairHandlerRegistry : IDisposable
         lock (_gate)
         {
             handlers = _entriesByHandler.Keys.ToList();
+            CancelAllInvisibleEvictions();
             _entriesByIdent.Clear();
             _entriesByHandler.Clear();
         }

LightlessSync/UI/SettingsUi.cs

@@ -1463,7 +1463,10 @@ public class SettingsUi : WindowMediatorSubscriberBase
             DrawPairPropertyRow("Has Handler", FormatBool(debugInfo.HasHandler));
             DrawPairPropertyRow("Handler Initialized", FormatBool(debugInfo.HandlerInitialized));
             DrawPairPropertyRow("Handler Visible", FormatBool(debugInfo.HandlerVisible));
+            DrawPairPropertyRow("Last Time person rendered in", FormatTimestamp(debugInfo.InvisibleSinceUtc));
+            DrawPairPropertyRow("Handler Timer Temp Collection removal", FormatCountdown(debugInfo.VisibilityEvictionRemainingSeconds));
             DrawPairPropertyRow("Handler Scheduled For Deletion", FormatBool(debugInfo.HandlerScheduledForDeletion));
+
             DrawPairPropertyRow("Note", pair.GetNote() ?? "(none)");
             ImGui.EndTable();
         }
@@ -1698,6 +1701,19 @@ public class SettingsUi : WindowMediatorSubscriberBase
         return value is null ? "n/a" : value.Value.ToLocalTime().ToString("G", CultureInfo.CurrentCulture);
     }
 
+    private static string? FormatCountdown(double? remainingSeconds)
+    {
+        if (!remainingSeconds.HasValue)
+            return "No";
+
+        var secs = Math.Max(0, remainingSeconds.Value);
+        var t = TimeSpan.FromSeconds(secs);
+
+        return t.TotalHours >= 1
+            ? $"{(int)t.TotalHours:00}:{t.Minutes:00}:{t.Seconds:00}"
+            : $"{(int)t.TotalMinutes:00}:{t.Seconds:00}";
+    }
+
     private static string FormatBytes(long value) => value < 0 ? "n/a" : UiSharedService.ByteToString(value);
 
     private static string FormatCharacterId(uint id) => id == uint.MaxValue ? "n/a" : $"{id} (0x{id:X8})";