(feature): split folder columns and keep oauth across upgrades

CHANGELOG.md

@@ -6,6 +6,20 @@ The format follows [Keep a Changelog](https://keepachangelog.com/) and [Semantic
 
 ## [Unreleased]
 
+## [0.3.6] - 2026-09-20
+
+Folder unread and retention days sit in separate columns. Sign-in and Gmail trash retention survive a rebuild.
+
+### Changed
+
+- Folder tree keeps unread count and retention days in two fixed columns on the right, instead of collapsing them next to the folder name.
+
+### Fixed
+
+- **Empty folder** stays enabled on folders that have mail, including while Get Messages is still running.
+- Installing a new build keeps Gmail and Outlook sign-in: leftover secrets and the Identity Hub profile are merged from the previous data folder, and a still-valid mailbox token is used if Hub refresh fails.
+- Gmail **[Gmail]/Trash** retention days show on the nested folder and permanently delete mail by received date after Get Messages or **Run now**.
+
 ## [0.3.5] - 2026-09-20
 
 Index status covers every mailbox, not one folder or one account.

data/eu.postclient.desktop.metainfo.xml

@@ -30,6 +30,11 @@
     <display_length compare="ge">768</display_length>
   </requires>
   <releases>
+    <release version="0.3.6" date="2026-09-20">
+      <description>
+        <p>Folder unread and retention days stay in separate columns. A new install keeps Gmail and Outlook sign-in. Gmail Trash retention shows on the nested folder and permanently deletes old trash.</p>
+      </description>
+    </release>
     <release version="0.3.5" date="2026-09-20">
       <description>
         <p>Keyword and meaning index status shows one done / total across all mailboxes, not the current folder or a single account.</p>

src/Directory.Build.props

@@ -3,7 +3,7 @@
     <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
-    <Version>0.3.5</Version>
+    <Version>0.3.6</Version>
     <Product>Postclient</Product>
     <AssemblyTitle>Postclient</AssemblyTitle>
     <Authors>Maksym Sadovnychyy</Authors>

src/MaksIT.PostClient.Client/MailAuthService.cs

@@ -46,12 +46,30 @@ public sealed class MailAuthService : IMailAuthService {
         "Sign in with Google or Microsoft in Account Settings (Identity Hub).");
 
     var tokens = loaded.Value;
-    if (!HasHubSession(tokens))
+    if (HasHubSession(tokens)) {
+      try {
+        return await RefreshHubMailboxAsync(account.Id, tokens, cancellationToken).ConfigureAwait(false);
+      }
+      catch (IdentityHubApiException ex) {
+        var cached = CachedMailbox(tokens);
+        if (cached is not null)
+          return cached;
+        return Result<MailAuthMaterial>.UnprocessableEntity(null, ex.Message);
+      }
+    }
+
+    var leftover = CachedMailbox(tokens);
+    if (leftover is not null)
+      return leftover;
     return Result<MailAuthMaterial>.UnprocessableEntity(
       null,
       "Sign in again through Identity Hub.");
+  }
 
-    try {
+  private async Task<Result<MailAuthMaterial>> RefreshHubMailboxAsync(
+    string mailboxId,
+    OAuthTokenSet tokens,
+    CancellationToken cancellationToken) {
     if (!string.IsNullOrWhiteSpace(tokens.HubRefreshToken)) {
       var refreshed = await _hub.RefreshTokenAsync(
         new RefreshTokenRequest { RefreshToken = tokens.HubRefreshToken },
@@ -62,10 +80,14 @@ public sealed class MailAuthService : IMailAuthService {
       tokens.HubExpires = AsUtc(refreshed.ExpiresAt);
       if (!string.IsNullOrWhiteSpace(refreshed.Username))
         tokens.Email = refreshed.Username;
-        SaveTokens(account.Id, tokens);
+      SaveTokens(mailboxId, tokens);
     }
-      else if (tokens.HubExpires <= DateTimeOffset.UtcNow.AddMinutes(2))
+    else if (tokens.HubExpires <= DateTimeOffset.UtcNow.AddMinutes(2)) {
+      var cached = CachedMailbox(tokens);
+      if (cached is not null)
+        return cached;
       return Result<MailAuthMaterial>.UnprocessableEntity(null, "Sign in again. The Hub session expired.");
+    }
 
     _hub.AccessToken = tokens.HubToken;
     var mailbox = await _hub.GetMailboxAccessTokenAsync(cancellationToken).ConfigureAwait(false);
@@ -73,15 +95,22 @@ public sealed class MailAuthService : IMailAuthService {
       return Result<MailAuthMaterial>.UnprocessableEntity(null, "Identity Hub did not return a mailbox token.");
     tokens.AccessToken = mailbox.AccessToken;
     tokens.AccessExpires = DateTimeOffset.UtcNow.AddMinutes(50);
-      SaveTokens(account.Id, tokens);
+    SaveTokens(mailboxId, tokens);
     return Result<MailAuthMaterial>.Ok(new MailAuthMaterial {
       UseOAuth = true,
       AccessToken = mailbox.AccessToken
     });
   }
-    catch (IdentityHubApiException ex) {
+
-      return Result<MailAuthMaterial>.UnprocessableEntity(null, ex.Message);
+  private static Result<MailAuthMaterial>? CachedMailbox(OAuthTokenSet tokens) {
-    }
+    if (string.IsNullOrWhiteSpace(tokens.AccessToken))
+      return null;
+    if (tokens.AccessExpires <= DateTimeOffset.UtcNow.AddMinutes(2))
+      return null;
+    return Result<MailAuthMaterial>.Ok(new MailAuthMaterial {
+      UseOAuth = true,
+      AccessToken = tokens.AccessToken
+    });
   }
 
   public Task<Result<OAuthTokenSet>> SignInAsync(

src/MaksIT.PostClient.Client/MailWorkerHost.cs

@@ -113,15 +113,23 @@ public sealed class MailWorkerHost : IDisposable {
     var configuration = _files.Current;
     configuration.EnsureDefaults();
     foreach (var job in MailRetention.Jobs(configuration.Retention)) {
+      var box = configuration.FindMailbox(job.MailboxId);
+      var remote = box is { IsLocalStore: false };
       var known = _archive.ListFolders(job.MailboxId);
       var folder = MailRetention.BindFolder(job.Folder, known);
       if (string.IsNullOrWhiteSpace(folder))
         continue;
       var cutoff = DateTimeOffset.UtcNow.AddDays(-job.Days);
-      var ids = _archive.UidsOlderThan(job.MailboxId, folder, cutoff);
+      var ids = _archive.UidsOlderThan(
+        job.MailboxId,
+        folder,
+        cutoff,
+        useReceivedDate: remote && MailRetention.IsTrash(folder));
       if (ids.Count == 0)
         continue;
       if (MailRetention.IsTrash(folder)) {
+        if (remote)
+          continue;
         DeleteFiles(_archive.RemoveUids(job.MailboxId, folder, ids));
         count += ids.Count;
         continue;

src/MaksIT.PostClient.Shared/AppPaths.cs

@@ -1,3 +1,6 @@
+using System.Text.Json;
+
+
 namespace MaksIT.PostClient.Shared;
 
 
@@ -202,12 +205,67 @@ public static class AppPaths {
     var oldRoam = Path.Combine(
       Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
       ProductName);
-    if (!Directory.Exists(dest) && Directory.Exists(oldLocal))
+    if (!Directory.Exists(dest) && Directory.Exists(oldLocal)) {
+      try {
         Directory.Move(oldLocal, dest);
+      }
+      catch {
+      }
+    }
+
     Directory.CreateDirectory(dest);
-    CopyIfMissing(Path.Combine(oldRoam, "settings.json"), Path.Combine(dest, "settings.json"));
+    AdoptSettingsIfEmpty(Path.Combine(oldRoam, "settings.json"), Path.Combine(dest, "settings.json"));
-    CopyIfMissing(Path.Combine(oldRoam, "secrets.bin"), Path.Combine(dest, "secrets.bin"));
+    AdoptSettingsIfEmpty(Path.Combine(oldLocal, "settings.json"), Path.Combine(dest, "settings.json"));
+    FileSecretStore.MergeMissingKeys(Path.Combine(oldRoam, "secrets.bin"), Path.Combine(dest, "secrets.bin"));
+    FileSecretStore.MergeMissingKeys(Path.Combine(oldLocal, "secrets.bin"), Path.Combine(dest, "secrets.bin"));
     CopyIfMissing(Path.Combine(oldRoam, "receipts.json"), Path.Combine(dest, "receipts.json"));
+    MergeMissingDirectory(oldLocal, dest);
+    MergeMissingDirectory(Path.Combine(oldLocal, "webview"), Path.Combine(dest, "webview"));
+  }
+
+  internal static void AdoptSettingsIfEmpty(string source, string dest) {
+    if (!File.Exists(source))
+      return;
+    if (!File.Exists(dest)) {
+      CopyIfMissing(source, dest);
+      return;
+    }
+
+    if (MailboxCount(dest) > 0 || MailboxCount(source) == 0)
+      return;
+    File.Copy(source, dest, overwrite: true);
+  }
+
+  internal static void MergeMissingDirectory(string source, string dest) {
+    if (!Directory.Exists(source))
+      return;
+    Directory.CreateDirectory(dest);
+    foreach (var file in Directory.GetFiles(source)) {
+      var name = Path.GetFileName(file);
+      if (name.Equals("settings.json", StringComparison.OrdinalIgnoreCase)
+          || name.Equals("secrets.bin", StringComparison.OrdinalIgnoreCase)
+          || name.EndsWith(".migrated", StringComparison.OrdinalIgnoreCase))
+        continue;
+      CopyIfMissing(file, Path.Combine(dest, name));
+    }
+
+    foreach (var dir in Directory.GetDirectories(source))
+      MergeMissingDirectory(dir, Path.Combine(dest, Path.GetFileName(dir)));
+  }
+
+  internal static int MailboxCount(string settingsPath) {
+    try {
+      using var document = JsonDocument.Parse(File.ReadAllText(settingsPath));
+      if (!document.RootElement.TryGetProperty("Configuration", out var configuration))
+        return 0;
+      if (!configuration.TryGetProperty("Mailboxes", out var boxes)
+          && !configuration.TryGetProperty("mailboxes", out boxes))
+        return 0;
+      return boxes.ValueKind == JsonValueKind.Array ? boxes.GetArrayLength() : 0;
+    }
+    catch {
+      return 0;
+    }
   }
 
   private static void CopyIfMissing(string source, string dest) {

src/MaksIT.PostClient.Shared/ConfigurationFileService.cs

@@ -10,7 +10,8 @@ public sealed class ConfigurationFileService {
 
   private static readonly JsonSerializerOptions SerializerOptions = new() {
     WriteIndented = true,
-    PropertyNamingPolicy = null
+    PropertyNamingPolicy = null,
+    PropertyNameCaseInsensitive = true
   };
 
   private readonly string? _seedPath;

src/MaksIT.PostClient.Shared/FileSecretStore.cs

@@ -64,11 +64,35 @@ public sealed class FileSecretStore : ISecretStore {
   public static string OAuthClientSecretKey(string? authKind) =>
     "oauth-client-secret:" + MailAuthKind.Normalize(authKind);
 
-  private Dictionary<string, string> Load() {
+  public static int MergeMissingKeys(string sourcePath, string destPath) {
-    if (!File.Exists(_path))
+    var source = ReadMap(sourcePath);
+    if (source.Count == 0)
+      return 0;
+    var dest = ReadMap(destPath);
+    var added = 0;
+    foreach (var pair in source) {
+      if (dest.ContainsKey(pair.Key))
+        continue;
+      dest[pair.Key] = pair.Value;
+      added++;
+    }
+
+    if (added > 0)
+      WriteMap(destPath, dest);
+    return added;
+  }
+
+  private Dictionary<string, string> Load() =>
+    ReadMap(_path);
+
+  private void Save(Dictionary<string, string> map) =>
+    WriteMap(_path, map);
+
+  private static Dictionary<string, string> ReadMap(string path) {
+    if (!File.Exists(path))
       return new Dictionary<string, string>(StringComparer.Ordinal);
     try {
-      var json = File.ReadAllText(_path);
+      var json = File.ReadAllText(path);
       return JsonSerializer.Deserialize<Dictionary<string, string>>(json)
         ?? new Dictionary<string, string>(StringComparer.Ordinal);
     }
@@ -77,13 +101,13 @@ public sealed class FileSecretStore : ISecretStore {
     }
   }
 
-  private void Save(Dictionary<string, string> map) {
+  private static void WriteMap(string path, Dictionary<string, string> map) {
-    var dir = Path.GetDirectoryName(_path);
+    var dir = Path.GetDirectoryName(path);
     if (!string.IsNullOrEmpty(dir))
       Directory.CreateDirectory(dir);
-    File.WriteAllText(_path, JsonSerializer.Serialize(map));
+    File.WriteAllText(path, JsonSerializer.Serialize(map));
     if (!OperatingSystem.IsWindows())
-      File.SetUnixFileMode(_path, UnixFileMode.UserRead | UnixFileMode.UserWrite);
+      File.SetUnixFileMode(path, UnixFileMode.UserRead | UnixFileMode.UserWrite);
   }
 
   private static string Protect(string secret) {

src/MaksIT.PostClient.Shared/MailArchiveCatalog.cs

@@ -387,8 +387,12 @@ public sealed class MailArchiveCatalog : IDisposable {
       return dest.InsertCopy(destMailboxId, destFolder, copy);
     });
 
-  public IReadOnlyList<uint> UidsOlderThan(string mailboxId, string folder, DateTimeOffset cutoff) =>
+  public IReadOnlyList<uint> UidsOlderThan(
-    OffUi(() => TryGet(mailboxId)?.UidsOlderThan(mailboxId, folder, cutoff) ?? []);
+    string mailboxId,
+    string folder,
+    DateTimeOffset cutoff,
+    bool useReceivedDate = false) =>
+    OffUi(() => TryGet(mailboxId)?.UidsOlderThan(mailboxId, folder, cutoff, useReceivedDate) ?? []);
 
   public int CopyDirectory(string source, string dest) =>
     OffUi(() => {

src/MaksIT.PostClient.Shared/MailArchiveStore.cs

@@ -638,6 +638,26 @@ public sealed class MailArchiveStore : IDisposable {
     }
   }
 
+  private bool HasMessageElsewhere(
+    SqliteTransaction tx,
+    string mailboxId,
+    string folder,
+    string? messageId) {
+    if (string.IsNullOrWhiteSpace(messageId))
+      return false;
+    using var cmd = _db.CreateCommand();
+    cmd.Transaction = tx;
+    cmd.CommandText = """
+      SELECT 1 FROM messages
+      WHERE mailbox_id = $m AND message_id = $mid AND folder <> $f
+      LIMIT 1;
+      """;
+    cmd.Parameters.AddWithValue("$m", mailboxId);
+    cmd.Parameters.AddWithValue("$mid", messageId.Trim());
+    cmd.Parameters.AddWithValue("$f", folder);
+    return cmd.ExecuteScalar() is not null;
+  }
+
   public MailArchiveCopy? ReadCopy(string mailboxId, string folder, uint uid) {
     lock (_gate) {
       using var cmd = _db.CreateCommand();
@@ -703,7 +723,12 @@ public sealed class MailArchiveStore : IDisposable {
         EmlPath = copy.Header.EmlPath,
         Labels = copy.Header.Labels
       };
-      var id = UpsertHeader(tx, mailboxId, header, updateFlags: true);
+      var id = UpsertHeader(
+        tx,
+        mailboxId,
+        header,
+        updateFlags: true,
+        stampTrashTime: MailRetention.IsTrash(folder));
       using (var body = _db.CreateCommand()) {
         body.Transaction = tx;
         body.CommandText = """
@@ -759,11 +784,15 @@ public sealed class MailArchiveStore : IDisposable {
     }
   }
 
-  public IReadOnlyList<uint> UidsOlderThan(string mailboxId, string folder, DateTimeOffset cutoff) {
+  public IReadOnlyList<uint> UidsOlderThan(
-    var trash = MailRetention.IsTrash(folder);
+    string mailboxId,
+    string folder,
+    DateTimeOffset cutoff,
+    bool useReceivedDate = false) {
+    var trashStamp = MailRetention.IsTrash(folder) && !useReceivedDate;
     lock (_gate) {
       using var cmd = _db.CreateCommand();
-      cmd.CommandText = trash
+      cmd.CommandText = trashStamp
         ? """
           SELECT uid FROM messages
           WHERE mailbox_id = $m AND folder = $f
@@ -869,7 +898,8 @@ public sealed class MailArchiveStore : IDisposable {
     SqliteTransaction tx,
     string mailboxId,
     MailArchiveHeader header,
-    bool updateFlags) {
+    bool updateFlags,
+    bool stampTrashTime = false) {
     using var cmd = _db.CreateCommand();
     cmd.Transaction = tx;
     var flagAssign = updateFlags
@@ -894,15 +924,11 @@ public sealed class MailArchiveStore : IDisposable {
         in_reply_to = excluded.in_reply_to,
         {flagAssign}
         has_attachments = excluded.has_attachments,
-        priority = excluded.priority,
+        priority = excluded.priority;
-        trashed_utc = CASE
-          WHEN messages.trashed_utc <> '' THEN messages.trashed_utc
-          WHEN $trash = 1 THEN excluded.trashed_utc
-          ELSE messages.trashed_utc
-        END;
       """;
     var trash = MailRetention.IsTrash(header.Folder);
-    var trashed = trash ? DateTimeOffset.UtcNow.ToString("O") : "";
+    var stampTrash = trash && (stampTrashTime || HasMessageElsewhere(tx, mailboxId, header.Folder, header.MessageId));
+    var trashed = stampTrash ? DateTimeOffset.UtcNow.ToString("O") : "";
     cmd.Parameters.AddWithValue("$m", mailboxId);
     cmd.Parameters.AddWithValue("$f", header.Folder);
     cmd.Parameters.AddWithValue("$u", header.Uid);
@@ -919,7 +945,6 @@ public sealed class MailArchiveStore : IDisposable {
     cmd.Parameters.AddWithValue("$att", header.HasAttachments ? 1 : 0);
     cmd.Parameters.AddWithValue("$pri", header.Priority);
     cmd.Parameters.AddWithValue("$trashed", trashed);
-    cmd.Parameters.AddWithValue("$trash", trash ? 1 : 0);
     cmd.ExecuteNonQuery();
     using var idCmd = _db.CreateCommand();
     idCmd.Transaction = tx;

src/MaksIT.PostClient.Shared/MailFolderRole.cs

@@ -123,6 +123,14 @@ public static class MailFolderRole {
   public static bool CanHoldFolders(string? name, string? fullName) =>
     IsNamespace(name, fullName) || IsCustom(name, fullName);
 
+  public static bool CanEmpty(string? name, string? fullName, string? incomingProtocol) {
+    if (string.IsNullOrWhiteSpace(name) && string.IsNullOrWhiteSpace(fullName))
+      return false;
+    if (IsNamespace(name, fullName))
+      return false;
+    return !MailProtocol.IsPop3(incomingProtocol);
+  }
+
   public static string? DisplayParent(
     string? name,
     string? fullName,

src/MaksIT.PostClient.Shared/MailRetention.cs

@@ -34,7 +34,24 @@ public static class MailRetention {
       .Where(folder => !string.IsNullOrWhiteSpace(folder))
       .Select(folder => (folder, folder))
       .ToList();
-    return MailRuleEngine.ExactFolder(wanted, list) ?? (wanted ?? "").Trim();
+    return MailRuleEngine.ExactFolder(wanted, list)
+      ?? MailRuleEngine.ResolveFolder(wanted, list)
+      ?? (wanted ?? "").Trim();
+  }
+
+  public static int DaysFor(string mailboxId, string folder, IEnumerable<FolderRetention>? retention) {
+    if (string.IsNullOrWhiteSpace(mailboxId) || string.IsNullOrWhiteSpace(folder))
+      return 0;
+    foreach (var row in Jobs(retention)) {
+      if (!row.MailboxId.Equals(mailboxId, StringComparison.OrdinalIgnoreCase))
+        continue;
+      if (row.Folder.Equals(folder, StringComparison.OrdinalIgnoreCase))
+        return row.Days;
+      if (IsTrash(folder) && IsTrash(row.Folder))
+        return row.Days;
+    }
+
+    return 0;
   }
 
   public static IReadOnlyList<FolderRetention> Jobs(IEnumerable<FolderRetention>? retention) {

src/MaksIT.PostClient.Tests/ArchiveTests.cs

@@ -288,16 +288,79 @@ public class MailArchiveStoreTests {
         [
           new MailArchiveHeader {
             Uid = 1,
+            Folder = "INBOX",
+            Subject = "Old",
+            From = "a@b.c",
+            MessageId = "old@mail",
+            Date = DateTimeOffset.UtcNow.AddDays(-40)
+          }
+        ]);
+      store.UpsertHeaders(
+        "box",
+        [
+          new MailArchiveHeader {
+            Uid = 2,
             Folder = MailRetention.TrashFolder,
             Subject = "Old",
             From = "a@b.c",
+            MessageId = "old@mail",
             Date = DateTimeOffset.UtcNow.AddDays(-40)
           }
         ]);
       var yesterday = DateTimeOffset.UtcNow.AddDays(-1);
       Assert.Empty(store.UidsOlderThan("box", MailRetention.TrashFolder, yesterday));
       var tomorrow = DateTimeOffset.UtcNow.AddDays(1);
-      Assert.Equal([1u], store.UidsOlderThan("box", MailRetention.TrashFolder, tomorrow));
+      Assert.Equal([2u], store.UidsOlderThan("box", MailRetention.TrashFolder, tomorrow));
+    }
+    finally {
+      DeleteArchive(path);
+    }
+  }
+
+  [Fact]
+  public void GmailTrashRetention_UsesReceivedDate() {
+    var path = Path.Combine(Path.GetTempPath(), "postclient-archive-" + Guid.NewGuid().ToString("N") + ".db");
+    try {
+      using var store = new MailArchiveStore(path);
+      store.UpsertHeaders(
+        "gmail",
+        [
+          new MailArchiveHeader {
+            Uid = 1,
+            Folder = "INBOX",
+            Subject = "Old trash",
+            From = "a@b.c",
+            MessageId = "old-trash@mail",
+            Date = DateTimeOffset.UtcNow.AddDays(-40)
+          }
+        ]);
+      store.UpsertHeaders(
+        "gmail",
+        [
+          new MailArchiveHeader {
+            Uid = 9,
+            Folder = "[Gmail]/Trash",
+            Subject = "Old trash",
+            From = "a@b.c",
+            MessageId = "old-trash@mail",
+            Date = DateTimeOffset.UtcNow.AddDays(-40)
+          }
+        ]);
+      var yesterday = DateTimeOffset.UtcNow.AddDays(-1);
+      Assert.Empty(store.UidsOlderThan("gmail", "[Gmail]/Trash", yesterday));
+      Assert.Equal([9u], store.UidsOlderThan("gmail", "[Gmail]/Trash", yesterday, useReceivedDate: true));
+      store.UpsertHeaders(
+        "gmail",
+        [
+          new MailArchiveHeader {
+            Uid = 3,
+            Folder = "[Gmail]/Trash",
+            Subject = "Already in trash",
+            From = "a@b.c",
+            Date = DateTimeOffset.UtcNow.AddDays(-40)
+          }
+        ]);
+      Assert.Equal([3u], store.UidsOlderThan("gmail", "[Gmail]/Trash", yesterday));
     }
     finally {
       DeleteArchive(path);

src/MaksIT.PostClient.Tests/OutlookRulesTests.cs

@@ -193,6 +193,28 @@ public class MailRetentionTests {
     Assert.Equal("Cestino", MailRetention.ResolveTrash(["INBOX", "Cestino"]));
     Assert.Equal(MailRetention.TrashFolder, MailRetention.ResolveTrash(["INBOX"]));
     Assert.True(MailRetention.IsTrash("Deleted Items"));
+    Assert.True(MailRetention.IsTrash("Trash", "[Gmail]/Trash"));
+  }
+
+  [Fact]
+  public void DaysFor_MatchesGmailTrashPath() {
+    var rows = new[] {
+      new FolderRetention { MailboxId = "gmail", Folder = "[Gmail]/Trash", Days = 7 }
+    };
+    Assert.Equal(7, MailRetention.DaysFor("gmail", "[Gmail]/Trash", rows));
+    Assert.Equal(7, MailRetention.DaysFor("gmail", "Trash", rows));
+    Assert.Equal(0, MailRetention.DaysFor("gmail", "INBOX", rows));
+    Assert.Equal(0, MailRetention.DaysFor("other", "[Gmail]/Trash", rows));
+  }
+
+  [Fact]
+  public void BindFolder_ResolvesGmailTrash() {
+    Assert.Equal(
+      "[Gmail]/Trash",
+      MailRetention.BindFolder("[Gmail]/Trash", ["INBOX", "[Gmail]/Trash", "[Gmail]/Spam"]));
+    Assert.Equal(
+      "[Gmail]/Trash",
+      MailRetention.BindFolder("Trash", ["INBOX", "[Gmail]/Trash"]));
   }
 }
 

src/MaksIT.PostClient.Tests/SharedTests.cs

@@ -102,6 +102,40 @@ public class AppPathsTests {
       Environment.SetEnvironmentVariable(AppPaths.ConfigEnv, previous);
     }
   }
+
+  [Fact]
+  public void AdoptSettingsIfEmpty_ReplacesSeedWithoutMailboxes() {
+    var dir = Path.Combine(Path.GetTempPath(), "postclient-mig-" + Guid.NewGuid().ToString("N"));
+    Directory.CreateDirectory(dir);
+    var source = Path.Combine(dir, "old.json");
+    var dest = Path.Combine(dir, "new.json");
+    try {
+      File.WriteAllText(source, """{"Configuration":{"Mailboxes":[{"Id":"keep"}]}}""");
+      File.WriteAllText(dest, """{"Configuration":{"Mailboxes":[]}}""");
+      AppPaths.AdoptSettingsIfEmpty(source, dest);
+      Assert.Equal(1, AppPaths.MailboxCount(dest));
+    }
+    finally {
+      Directory.Delete(dir, true);
+    }
+  }
+
+  [Fact]
+  public void MergeMissingDirectory_CopiesHubProfile() {
+    var dir = Path.Combine(Path.GetTempPath(), "postclient-wv-" + Guid.NewGuid().ToString("N"));
+    var source = Path.Combine(dir, "old", "webview", "hub");
+    var dest = Path.Combine(dir, "new", "webview");
+    Directory.CreateDirectory(source);
+    Directory.CreateDirectory(dest);
+    try {
+      File.WriteAllText(Path.Combine(source, "session"), "hub");
+      AppPaths.MergeMissingDirectory(Path.Combine(dir, "old", "webview"), dest);
+      Assert.True(File.Exists(Path.Combine(dest, "hub", "session")));
+    }
+    finally {
+      Directory.Delete(dir, true);
+    }
+  }
 }
 
 
@@ -491,6 +525,21 @@ public class MailFolderRoleTests {
     Assert.False(MailFolderRole.IsCustom("All Mail", "[Gmail]/All Mail"));
   }
 
+  [Fact]
+  public void CanEmpty_AllowsImapFoldersWithMail() {
+    Assert.True(MailFolderRole.CanEmpty("INBOX", "INBOX", MailProtocol.Imap));
+    Assert.True(MailFolderRole.CanEmpty("Clients", "INBOX.Clients", MailProtocol.Imap));
+    Assert.True(MailFolderRole.CanEmpty("Trash", "[Gmail]/Trash", MailProtocol.Imap));
+    Assert.True(MailFolderRole.CanEmpty("Inbox", "Inbox", MailProtocol.Store));
+  }
+
+  [Fact]
+  public void CanEmpty_RejectsNamespaceAndPop3() {
+    Assert.False(MailFolderRole.CanEmpty("[Gmail]", "[Gmail]", MailProtocol.Imap));
+    Assert.False(MailFolderRole.CanEmpty("INBOX", "INBOX", MailProtocol.Pop3));
+    Assert.False(MailFolderRole.CanEmpty(null, null, MailProtocol.Imap));
+  }
+
   [Fact]
   public void GmailTrash_IsTrash() {
     Assert.Equal("trash", MailFolderRole.Kind("Trash", "[Gmail]/Trash"));
@@ -677,6 +726,28 @@ public class FileSecretStoreTests {
         File.Delete(path);
     }
   }
+
+  [Fact]
+  public void MergeMissingKeys_KeepsDestAndFillsGaps() {
+    var dest = Path.Combine(Path.GetTempPath(), "postclient-secrets-d-" + Guid.NewGuid().ToString("N") + ".bin");
+    var source = Path.Combine(Path.GetTempPath(), "postclient-secrets-s-" + Guid.NewGuid().ToString("N") + ".bin");
+    try {
+      var destStore = new FileSecretStore(dest);
+      destStore.Put("oauth:keep", "new");
+      var sourceStore = new FileSecretStore(source);
+      sourceStore.Put("oauth:keep", "old");
+      sourceStore.Put("oauth:missing", "legacy");
+      Assert.Equal(1, FileSecretStore.MergeMissingKeys(source, dest));
+      Assert.Equal("new", destStore.Get("oauth:keep").Value);
+      Assert.Equal("legacy", destStore.Get("oauth:missing").Value);
+    }
+    finally {
+      if (File.Exists(dest))
+        File.Delete(dest);
+      if (File.Exists(source))
+        File.Delete(source);
+    }
+  }
 }
 
 
@@ -765,6 +836,7 @@ public class ConfigurationFileServiceTests {
       var reloaded = new ConfigurationFileService(path).Current;
       Assert.Single(reloaded.Mailboxes);
       Assert.Equal("a@b.it", reloaded.Mailboxes[0].Address);
+      Assert.Equal(configuration.Mailboxes[0].Id, reloaded.Mailboxes[0].Id);
       Assert.Equal("imap.example.it", reloaded.Mailboxes[0].ImapHost);
       Assert.Equal(MailCertifiedKind.Pec, reloaded.Mailboxes[0].CertifiedKind);
     }
@@ -773,6 +845,32 @@ public class ConfigurationFileServiceTests {
     }
   }
 
+  [Fact]
+  public void Load_KeepsCamelCaseMailboxId() {
+    var dir = Path.Combine(Path.GetTempPath(), "postclient-cfg-" + Guid.NewGuid().ToString("N"));
+    Directory.CreateDirectory(dir);
+    var path = Path.Combine(dir, "settings.json");
+    try {
+      File.WriteAllText(
+        path,
+        """
+        {
+          "Configuration": {
+            "Mailboxes": [
+              { "id": "abc123", "Address": "a@b.it", "AuthKind": "google" }
+            ]
+          }
+        }
+        """);
+      var loaded = new ConfigurationFileService(path).Current;
+      Assert.Equal("abc123", loaded.Mailboxes[0].Id);
+      Assert.Equal(MailAuthKind.Google, loaded.Mailboxes[0].AuthKind);
+    }
+    finally {
+      Directory.Delete(dir, true);
+    }
+  }
+
   [Fact]
   public void SaveReload_KeepsLayout() {
     var dir = Path.Combine(Path.GetTempPath(), "postclient-cfg-" + Guid.NewGuid().ToString("N"));

src/MaksIT.PostClient.Tests/StoreAndHubTests.cs

@@ -147,6 +147,26 @@ public class MailAuthServiceHubTests {
     Assert.Equal("imap-mailbox-token", result.Value?.AccessToken);
     Assert.Equal("user@outlook.com", result.Value?.Email);
   }
+
+  [Fact]
+  public async Task ResolveAsync_UsesCachedMailboxTokenWhenHubRefreshFails() {
+    var secrets = new FileSecretStore(Path.Combine(Path.GetTempPath(), "postclient-hub-" + Guid.NewGuid().ToString("N") + ".bin"));
+    var hub = new FakeIdentityHub { FailRefresh = true };
+    var auth = new MailAuthService(secrets, hub);
+    var box = new MailboxAccount { AuthKind = MailAuthKind.Google };
+    auth.SaveTokens(box.Id, new OAuthTokenSet {
+      HubToken = "hub-jwt",
+      HubRefreshToken = "hub-refresh",
+      HubExpires = DateTimeOffset.UtcNow.AddHours(1),
+      AccessToken = "cached-imap",
+      AccessExpires = DateTimeOffset.UtcNow.AddMinutes(30),
+      Email = "user@gmail.com"
+    });
+    var material = await auth.ResolveAsync(box, password: null, TestContext.Current.CancellationToken);
+    Assert.True(material.IsSuccess);
+    Assert.Equal("cached-imap", material.Value?.AccessToken);
+    Assert.Equal(1, hub.RefreshCalls);
+  }
 }
 
 
@@ -180,6 +200,8 @@ file sealed class FakeIdentityHub : IIdentityHubClient {
 
   public int RefreshCalls { get; private set; }
 
+  public bool FailRefresh { get; set; }
+
   public Task CheckHealthLiveAsync(CancellationToken cancellationToken = default) =>
     Task.CompletedTask;
 
@@ -214,6 +236,8 @@ file sealed class FakeIdentityHub : IIdentityHubClient {
 
   public Task<LoginResponse> RefreshTokenAsync(RefreshTokenRequest request, CancellationToken cancellationToken = default) {
     RefreshCalls++;
+    if (FailRefresh)
+      throw new IdentityHubApiException(401, "refresh failed", "", null);
     return Task.FromResult(new LoginResponse(
       "Bearer",
       "hub-jwt-refreshed",

src/MaksIT.PostClient.UI/MainWindow.axaml

@@ -199,11 +199,27 @@
           </TreeView.ContextFlyout>
           <TreeView.ItemTemplate>
             <TreeDataTemplate ItemsSource="{Binding Children}">
-              <Grid ColumnDefinitions="20,*,Auto,Auto" Margin="0,1" HorizontalAlignment="Stretch">
+              <DockPanel LastChildFill="True" Margin="0,1" HorizontalAlignment="Stretch">
+                <TextBlock DockPanel.Dock="Right"
+                           Width="44"
+                           Text="{Binding RetentionLabel}"
+                           Classes="hint folder-meta"
+                           TextAlignment="Right"
+                           VerticalAlignment="Center"
+                           Margin="0,0,4,0" />
+                <TextBlock DockPanel.Dock="Right"
+                           Width="40"
+                           Text="{Binding UnreadLabel}"
+                           Classes="unread-count folder-meta"
+                           TextAlignment="Right"
+                           VerticalAlignment="Center"
+                           Margin="8,0,4,0" />
                 <TextBlock Text="{Binding Glyph}"
+                           Width="20"
                            FontSize="12"
-                           VerticalAlignment="Center" />
+                           VerticalAlignment="Center"
-                <StackPanel Grid.Column="1" Spacing="2" VerticalAlignment="Center">
+                           DockPanel.Dock="Left" />
+                <StackPanel Spacing="2" VerticalAlignment="Center" Margin="0,0,4,0">
                   <TextBlock Text="{Binding Title}"
                              FontWeight="{Binding Weight}"
                              TextTrimming="CharacterEllipsis"
@@ -214,19 +230,7 @@
                                Value="{Binding QuotaPercent}"
                                IsVisible="{Binding ShowQuota}" />
                 </StackPanel>
-                <TextBlock Grid.Column="2"
+              </DockPanel>
-                           Text="{Binding UnreadLabel}"
-                           Classes="unread-count"
-                           Margin="8,0,4,0"
-                           VerticalAlignment="Center"
-                           IsVisible="{Binding HasUnread}" />
-                <TextBlock Grid.Column="3"
-                           Text="{Binding RetentionLabel}"
-                           Classes="hint"
-                           Margin="0,0,4,0"
-                           VerticalAlignment="Center"
-                           IsVisible="{Binding HasRetention}" />
-              </Grid>
             </TreeDataTemplate>
           </TreeView.ItemTemplate>
         </TreeView>

src/MaksIT.PostClient.UI/MainWindow.axaml.cs

@@ -358,6 +358,8 @@ public partial class MainWindow : Window {
       if (current is Control { DataContext: FolderNodeViewModel node }) {
         if (!vm.SelectedFolderNodes.Contains(node))
           vm.SetSelectedFolders([node], node);
+        else
+          vm.RefreshFolderMenu();
         RestoreFolderTreeSelection();
         return;
       }

src/MaksIT.PostClient.UI/Themes/Dark.axaml

@@ -250,6 +250,9 @@
     <Setter Property="FontSize" Value="12" />
     <Setter Property="FontWeight" Value="SemiBold" />
   </Style>
+  <Style Selector="TextBlock.folder-meta">
+    <Setter Property="MinHeight" Value="16" />
+  </Style>
   <Style Selector="TreeView">
     <Setter Property="Background" Value="Transparent" />
     <Setter Property="BorderThickness" Value="0" />
@@ -258,6 +261,10 @@
     <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
     <Setter Property="Padding" Value="2,2" />
     <Setter Property="MinHeight" Value="24" />
+    <Setter Property="HorizontalAlignment" Value="Stretch" />
+  </Style>
+  <Style Selector="TreeViewItem /template/ ContentPresenter#PART_HeaderPresenter">
+    <Setter Property="HorizontalAlignment" Value="Stretch" />
   </Style>
   <Style Selector="TreeViewItem:selected /template/ Border#PART_LayoutRoot">
     <Setter Property="Background" Value="#006199" />

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

@@ -1036,14 +1036,20 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
       if (string.IsNullOrWhiteSpace(folder))
         continue;
       var cutoff = DateTimeOffset.UtcNow.AddDays(-job.Days);
-      var ids = _archive.UidsOlderThan(box.Id, folder, cutoff);
+      var ids = _archive.UidsOlderThan(
+        box.Id,
+        folder,
+        cutoff,
+        useReceivedDate: MailRetention.IsTrash(folder));
       if (ids.Count == 0)
         continue;
       var session = SessionFor(box);
       if (session is not { IsConnected: true })
         continue;
       if (MailRetention.IsTrash(folder)) {
-        await session.SetMessageFlagsAsync(folder, ids, new MailFlagUpdate { Deleted = true });
+        var purged = await session.SetMessageFlagsAsync(folder, ids, new MailFlagUpdate { Deleted = true });
+        if (purged.IsSuccess)
+          DropArchived(box.Id, folder, ids);
         continue;
       }
 
@@ -1052,7 +1058,9 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
       var trash = MailRetention.ResolveTrash(
         FoldersFor(box).Select(f => (f.Name, f.FullName)).ToList());
       if (folder.Equals(trash, StringComparison.OrdinalIgnoreCase)) {
-        await session.SetMessageFlagsAsync(folder, ids, new MailFlagUpdate { Deleted = true });
+        var purged = await session.SetMessageFlagsAsync(folder, ids, new MailFlagUpdate { Deleted = true });
+        if (purged.IsSuccess)
+          DropArchived(box.Id, folder, ids);
         continue;
       }
 
@@ -1421,10 +1429,12 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
     else if (SelectedFolderNodes.Count > 0
         && (SelectedFolderNode is null || !SelectedFolderNodes.Contains(SelectedFolderNode)))
       SelectedFolderNode = SelectedFolderNodes[0];
-    NotifyFolderCommands();
+    RefreshFolderMenu();
-    OnPropertyChanged(nameof(EmptyFolderLabel));
   }
 
+  public void RefreshFolderMenu() =>
+    NotifyFolderCommands();
+
   public IReadOnlyList<uint> DragMessageIds(MessageRowViewModel source) {
     if (SelectedMessages.Contains(source))
       return SelectedMessages.Select(row => row.Header.Id).ToList();
@@ -1708,22 +1718,26 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
 
   [RelayCommand(CanExecute = nameof(CanEmptyFolder))]
   private async Task EmptyFolderAsync() {
-    var session = ActiveSession;
+    var node = TargetFolderNodes().FirstOrDefault();
-    var box = SelectedMailbox;
+    var folder = node?.Folder ?? SelectedFolder;
-    var folder = TargetFolderNodes().FirstOrDefault()?.Folder ?? SelectedFolder;
+    var box = node?.Mailbox ?? SelectedMailbox;
-    if (session is not { IsConnected: true, SupportsFolders: true } || box is null || folder is null)
+    if (folder is null
+        || box is null
+        || !MailFolderRole.CanEmpty(folder.Name, folder.FullName, box.IncomingProtocol))
       return;
-    var trash = await EnsureTrashFolderAsync(box, CancellationToken.None);
+    var purge = MailRetention.IsTrash(folder.Name, folder.FullName);
-    var purge = string.IsNullOrWhiteSpace(trash)
-      || trash.Equals(folder.FullName, StringComparison.OrdinalIgnoreCase);
     var confirm = string.Format(purge ? Copy.EmptyTrashConfirm : Copy.EmptyFolderConfirm, folder.Name);
     if (!await ConfirmAsync(purge ? Copy.DeleteAllItems : Copy.EmptyFolder, confirm))
       return;
     await RunAsync(Copy.EmptyingFolder, async token => {
-      var result = await session.EmptyFolderAsync(
+      var session = await EnsureMailboxReadyAsync(box, token);
-        folder.FullName,
+      if (session is not { IsConnected: true, SupportsFolders: true }) {
-        purge ? null : trash,
+        Status = ArchiveFiles.Hint();
-        token);
+        return;
+      }
+
+      var trash = purge ? null : await EnsureTrashFolderAsync(box, token);
+      var result = await session.EmptyFolderAsync(folder.FullName, trash, token);
       if (!result.IsSuccess) {
         Status = string.Join(" ", result.Messages);
         return;
@@ -1732,7 +1746,8 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
       ForgetLocalFolder(box.Id, folder.FullName);
       folder.Total = 0;
       folder.Unread = 0;
-      if (SelectedFolder?.FullName.Equals(folder.FullName, StringComparison.OrdinalIgnoreCase) == true) {
+      if (SelectedMailbox?.Id.Equals(box.Id, StringComparison.OrdinalIgnoreCase) == true
+          && SelectedFolder?.FullName.Equals(folder.FullName, StringComparison.OrdinalIgnoreCase) == true) {
         Messages.Clear();
         VisibleMessages.Clear();
         SelectedMessage = null;
@@ -2010,12 +2025,12 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
     CanManageFolders();
 
   private bool CanEmptyFolder() {
-    var folder = TargetFolderNodes().FirstOrDefault()?.Folder ?? SelectedFolder;
+    var node = TargetFolderNodes().FirstOrDefault();
-    if (folder is null || MailFolderRole.IsNamespace(folder.Name, folder.FullName))
+    var folder = node?.Folder ?? SelectedFolder;
+    var box = node?.Mailbox ?? SelectedMailbox;
+    if (folder is null || box is null)
       return false;
-    if (SelectedMailbox is { IsLocalStore: true } && !IsBusy)
+    return MailFolderRole.CanEmpty(folder.Name, folder.FullName, box.IncomingProtocol);
-      return ActiveSession is { IsConnected: true, SupportsFolders: true };
-    return CanManageFolders();
   }
 
   private bool CanDeleteCustomFolder() =>
@@ -2222,6 +2237,7 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
   partial void OnIsBusyChanged(bool value) {
     OnPropertyChanged(nameof(ShowDetachPst));
     DetachPstCommand.NotifyCanExecuteChanged();
+    NotifyFolderCommands();
   }
 
   partial void OnSelectedFolderChanged(FolderRowViewModel? value) {
@@ -2602,7 +2618,9 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
       var expanded = previous.TryGetValue(folder.FullName, out var keep)
         ? keep
         : SavedFolderExpanded(box, folder.FullName);
-      map[folder.FullName] = FolderNodeViewModel.ForFolder(box, folder, expanded);
+      var childNode = FolderNodeViewModel.ForFolder(box, folder, expanded);
+      childNode.RetentionDays = MailRetention.DaysFor(box.Id, folder.FullName, _files.Current.Retention);
+      map[folder.FullName] = childNode;
     }
     foreach (var folder in rows
       .OrderBy(f => MailFolderRole.SortKey(f.Name, f.FullName))
@@ -4389,12 +4407,8 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
       f.FullName.Equals(fullName, StringComparison.OrdinalIgnoreCase));
 
   private void NotifyFolderCounts() {
-    foreach (var account in FolderTree) {
+    foreach (var account in FolderTree)
       ApplyRetentionBadge(account);
-      foreach (var child in account.Children)
-        child.NotifyCounts();
-      account.NotifyCounts();
-    }
   }
 
   public void RefreshRetentionBadges() =>
@@ -4402,23 +4416,14 @@ public partial class MainViewModel : ObservableObject, IAsyncDisposable {
 
   private void ApplyRetentionBadge(FolderNodeViewModel node) {
     if (node.Mailbox is { } box && node.Folder is { } folder)
-      node.RetentionDays = RetentionDaysFor(box.Id, folder.FullName);
+      node.RetentionDays = MailRetention.DaysFor(box.Id, folder.FullName, _files.Current.Retention);
     else
       node.RetentionDays = 0;
+    node.NotifyCounts();
     foreach (var child in node.Children)
       ApplyRetentionBadge(child);
   }
 
-  private int RetentionDaysFor(string mailboxId, string folder) {
-    foreach (var row in _files.Current.Retention ?? []) {
-      if (row.MailboxId.Equals(mailboxId, StringComparison.OrdinalIgnoreCase)
-          && row.Folder.Equals(folder, StringComparison.OrdinalIgnoreCase))
-        return row.Days;
-    }
-
-    return 0;
-  }
-
   private void RefreshFolderStats() {
     if (SelectedFolder is null) {
       FolderStats = "";

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

@@ -152,7 +152,10 @@ public sealed partial class FolderNodeViewModel : ObservableObject {
   public bool HasUnread =>
     Unread > 0;
 
-  public int RetentionDays { get; set; }
+  [ObservableProperty]
+  [NotifyPropertyChangedFor(nameof(RetentionLabel))]
+  [NotifyPropertyChangedFor(nameof(HasRetention))]
+  private int retentionDays;
 
   public string RetentionLabel =>
     UiLocale.Copy.RetentionBadge(RetentionDays);