(bugfix): keep index status lines from flashing between batches

CHANGELOG.md

@@ -6,6 +6,14 @@ The format follows [Keep a Changelog](https://keepachangelog.com/) and [Semantic
 
 ## [Unreleased]
 
+## [0.3.4] - 2026-09-20
+
+Status bar index lines no longer flash between batches.
+
+### Fixed
+
+- Status bar **Indexing** / **Indexing meaning** lines stay put between batches instead of collapsing and flashing.
+
 ## [0.3.3] - 2026-09-20
 
 First sync paints mail as it arrives, meaning search can use a discrete GPU, and trash, retention, and logs follow typical desktop mail apps.

data/eu.postclient.desktop.metainfo.xml

@@ -30,6 +30,11 @@
     <display_length compare="ge">768</display_length>
   </requires>
   <releases>
+    <release version="0.3.4" date="2026-09-20">
+      <description>
+        <p>Status bar indexing and meaning-index lines stay visible between batches instead of flashing.</p>
+      </description>
+    </release>
     <release version="0.3.3" date="2026-09-20">
       <description>
         <p>First sync paints mail as it arrives. Meaning search DirectML prefers a discrete GPU. Trash retention, logs, and folder menus match typical desktop mail apps.</p>

src/Directory.Build.props

@@ -3,7 +3,7 @@
     <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
-    <Version>0.3.3</Version>
+    <Version>0.3.4</Version>
     <Product>Postclient</Product>
     <AssemblyTitle>Postclient</AssemblyTitle>
     <Authors>Maksym Sadovnychyy</Authors>

src/MaksIT.PostClient.Client/ISemanticSearchService.cs

@@ -19,6 +19,8 @@ public interface ISemanticSearchService : IDisposable {
 
   void NotifySettingsChanged();
 
+  void Wake();
+
   float[]? EmbedQuery(string query);
 
   ArchiveIndexStats IndexStats();

src/MaksIT.PostClient.Client/SemanticSearchService.cs

@@ -17,6 +17,7 @@ public sealed class SemanticSearchService : ISemanticSearchService {
   private bool _gpuFailed;
   private string _status = "";
   private bool _ready;
+  private long _statusTick;
 
   public SemanticSearchService(ConfigurationFileService files, MailArchiveCatalog archive) {
     _files = files;
@@ -51,6 +52,10 @@ public sealed class SemanticSearchService : ISemanticSearchService {
 
   public void NotifySettingsChanged() {
     _step?.Cancel();
+    Wake();
+  }
+
+  public void Wake() {
     try {
       _wake.Release();
     }
@@ -189,6 +194,9 @@ public sealed class SemanticSearchService : ISemanticSearchService {
 
       var pending = _archive.PendingEmbeddings(EmbeddingModelSpec.Id, 8, ready);
       if (pending.Count == 0) {
+        await DelayAsync(TimeSpan.FromMilliseconds(800), token).ConfigureAwait(false);
+        if (_archive.PendingEmbeddings(EmbeddingModelSpec.Id, 1, ready).Count > 0)
+          continue;
         SetStatus("", ready: true);
         await WaitAsync(token).ConfigureAwait(false);
         return;
@@ -307,11 +315,20 @@ public sealed class SemanticSearchService : ISemanticSearchService {
 
   private void SetStatus(string line, bool ready) {
     var nextReady = ready && _embedder is not null;
+    var now = Environment.TickCount64;
     lock (_gate) {
       if (_status == line && _ready == nextReady)
         return;
+      var hide = string.IsNullOrWhiteSpace(line);
+      if (!hide && !string.IsNullOrWhiteSpace(_status) && now - _statusTick < 250) {
         _status = line;
         _ready = nextReady;
+        return;
+      }
+
+      _status = line;
+      _ready = nextReady;
+      _statusTick = now;
     }
 
     Changed?.Invoke();

src/MaksIT.PostClient.UI/ViewModels/MainViewModel.cs

@@ -39,6 +39,8 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
   private const int IndexCatalogChunk = 2_000;
   private const int IndexUiChunk = 250;
   private int _indexBodyTotal;
+  private readonly StatusLineHold _indexHold;
+  private readonly StatusLineHold _semanticHold;
   private bool _uiReady;
   private MailMessageBody? _reading;
   private MessageRowViewModel? _pendingWindow;
@@ -455,6 +457,8 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
     _worker = worker;
     _semantic = semantic;
     _updates = updates;
+    _indexHold = new StatusLineHold(line => IndexLine = line);
+    _semanticHold = new StatusLineHold(line => SemanticLine = line);
     files.Current.EnsureDefaults();
     PstStoreMigrator.Migrate(files, archive);
     MailArchiveCatalog.MigrateLegacy(files.Current.Mailboxes);
@@ -512,6 +516,8 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
     _semantic.Changed -= OnSemanticChanged;
     _semantic.Faulted -= OnSemanticFaulted;
     _semantic.Dispose();
+    _indexHold.Dispose();
+    _semanticHold.Dispose();
     List<IMailSession> sessions;
     lock (_connections) {
       sessions = [.. _connections.Values];
@@ -533,8 +539,7 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
       var line = _semantic.StatusLine;
       if (line.Contains("ready", StringComparison.OrdinalIgnoreCase))
         line = "";
-      if (SemanticLine != line)
+      _semanticHold.Set(line);
-        SemanticLine = line;
     });
 
   [RelayCommand]
@@ -1862,7 +1867,7 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
         ? _archive.RemoveFolder(mailboxId, folder)
         : _archive.RemoveUids(mailboxId, folder, uids));
     if (IsInitialSyncComplete(mailboxId))
-      _semantic.NotifySettingsChanged();
+      _semantic.Wake();
   }
 
   private static void DeleteEmlFiles(IEnumerable<string> paths) {
@@ -3172,7 +3177,7 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
     }
 
     if (ready)
-      _semantic.NotifySettingsChanged();
+      _semantic.Wake();
   }
 
   private async Task LoadMessagesAsync(string folder, CancellationToken token, bool resumeBodies = false) {
@@ -3684,7 +3689,7 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
         MailArchiveMap.BodyText(body, UnwrapEnvelope),
         MailArchiveMap.AttachmentIndex(body, UnwrapEnvelope));
       if (IsInitialSyncComplete(mailboxId))
-        _semantic.NotifySettingsChanged();
+        _semantic.Wake();
     }
     catch {
     }
@@ -3747,7 +3752,7 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
     _backfill?.Cancel();
     _backfill?.Dispose();
     _backfill = null;
-    IndexLine = "";
+    _indexHold.ClearNow();
   }
 
   private void EnsureIndexing(string mailboxId) {
@@ -3777,7 +3782,7 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
     _backfill?.Cancel();
     _backfill?.Dispose();
     _backfill = null;
-    IndexLine = "";
+    _indexHold.ClearNow();
   }
 
   private void StartIndexing() {
@@ -3858,7 +3863,6 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
         if (pending.Count == 0) {
           if (!cataloged)
             break;
-          await SetIndexLineAsync("", token).ConfigureAwait(false);
           continue;
         }
 
@@ -3887,8 +3891,10 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
           }
         }
 
-        if (fetched == 0 && !cataloged)
+        if (fetched == 0 && !cataloged) {
-          break;
+          await Task.Delay(500, token).ConfigureAwait(false);
+          continue;
+        }
       }
     }
     catch (OperationCanceledException) {
@@ -3907,9 +3913,13 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
             _indexMailboxes.Remove(id);
         }
 
-        IndexLine = "";
+        var again = _indexMailboxes.Any(id => SessionFor(MailboxById(id)) is { IsConnected: true });
+        if (!again) {
+          _indexHold.Set("");
           _indexBodyTotal = 0;
-        if (_indexMailboxes.Any(id => SessionFor(MailboxById(id)) is { IsConnected: true }))
+          return;
+        }
+
         StartIndexing();
       });
     }
@@ -3949,7 +3959,7 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
   private async Task SetIndexLineAsync(string line, CancellationToken token) =>
     await UiAsync(() => {
       if (!token.IsCancellationRequested)
-        IndexLine = line;
+        _indexHold.Set(line);
     }).ConfigureAwait(false);
 
   private MailboxAccount? MailboxById(string mailboxId) =>

src/MaksIT.PostClient.UI/ViewModels/StatusLineHold.cs

@@ -0,0 +1,104 @@
+using Avalonia.Threading;
+
+
+namespace MaksIT.PostClient.UI.ViewModels;
+
+
+internal sealed class StatusLineHold {
+  private readonly Action<string> _apply;
+  private readonly int _minShowMs;
+  private readonly int _hideMs;
+  private string _wanted = "";
+  private string _shown = "";
+  private long _shownAt;
+  private int _gen;
+  private CancellationTokenSource? _delay;
+
+  public StatusLineHold(Action<string> apply, int minShowMs = 250, int hideMs = 800) {
+    _apply = apply;
+    _minShowMs = minShowMs;
+    _hideMs = hideMs;
+  }
+
+  public void Set(string line) {
+    _wanted = line ?? "";
+    CancelDelay();
+    if (!string.IsNullOrWhiteSpace(_wanted)) {
+      _gen++;
+      var now = Environment.TickCount64;
+      if (_shown == _wanted)
+        return;
+      if (_shown.Length > 0 && now - _shownAt < _minShowMs) {
+        Start(FlushLater);
+        return;
+      }
+
+      Show(_wanted);
+      return;
+    }
+
+    var gen = ++_gen;
+    Start(token => HideLater(gen, token));
+  }
+
+  public void ClearNow() {
+    CancelDelay();
+    _gen++;
+    _wanted = "";
+    Show("");
+  }
+
+  public void Dispose() =>
+    CancelDelay();
+
+  private void Start(Func<CancellationToken, Task> work) {
+    var delay = new CancellationTokenSource();
+    _delay = delay;
+    _ = work(delay.Token);
+  }
+
+  private async Task FlushLater(CancellationToken token) {
+    var wait = _minShowMs - (int)(Environment.TickCount64 - _shownAt);
+    if (wait < 0)
+      wait = 0;
+    try {
+      await Task.Delay(wait, token).ConfigureAwait(false);
+    }
+    catch (OperationCanceledException) {
+      return;
+    }
+
+    await Dispatcher.UIThread.InvokeAsync(() => {
+      if (!string.IsNullOrWhiteSpace(_wanted) && _wanted != _shown)
+        Show(_wanted);
+    });
+  }
+
+  private async Task HideLater(int gen, CancellationToken token) {
+    try {
+      await Task.Delay(_hideMs, token).ConfigureAwait(false);
+    }
+    catch (OperationCanceledException) {
+      return;
+    }
+
+    await Dispatcher.UIThread.InvokeAsync(() => {
+      if (gen != _gen)
+        return;
+      if (string.IsNullOrWhiteSpace(_wanted))
+        Show("");
+    });
+  }
+
+  private void Show(string line) {
+    _shown = line;
+    _shownAt = Environment.TickCount64;
+    _apply(line);
+  }
+
+  private void CancelDelay() {
+    _delay?.Cancel();
+    _delay?.Dispose();
+    _delay = null;
+  }
+}