v0.20.0 — Cancel-from-red-button waits for segments + new Verifying row state

Two related UX bugs fixed.

1) Red "Annuler" button on a row : DL appeared to keep going

The button calls RestartFromZeroAsync which used to fire
_activeDownloadCts.Cancel() then sleep 200 ms then delete the .partial.
With 16 parallel segments mid-write, 200 ms is way too short — the
segments were still flushing buffers when the file got deleted, then
recreated it from their own write streams, making it look like the
download "continued".

Now we keep a reference to the in-flight install Task
(_activeInstallTask) and properly await it (with a 10 s safety timeout)
before discarding state. This guarantees all segment FileStreams are
closed and the .partial deletion is the final word.

2) Progress bar said "Downloading…" during SHA-256 verification

The footer message switched to "🔍 Vérification SHA-256 v…" but the
row's badge stayed on "⬇ Downloading…" because row.State stayed at
Downloading throughout DownloadAsync (which internally chains DL +
verify). New VersionRowState.Verifying inserted between Downloading
and Installing, applied on the first hashProgress callback. Badge now
reads "🔍 Vérification…" / "🔍 Verifying…" during the hash phase.

VersionRowViewModel.IsBusy now also includes Verifying so commands
that gate on busy stay disabled during verification.

Versions bumped to 0.20.0.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

installer/PSLauncher.iss

@@ -11,7 +11,7 @@
 
 #define MyAppName        "PROSERVE Launcher"
 #define MyAppShortName   "PS_Launcher"
-#define MyAppVersion     "0.19.0"
+#define MyAppVersion     "0.20.0"
 #define MyAppPublisher   "ASTERION VR"
 #define MyAppURL         "https://asterionvr.com"
 #define MyAppExeName     "PS_Launcher.exe"

src/PSLauncher.App/PSLauncher.App.csproj

@@ -15,9 +15,9 @@
     <Product>PROSERVE Launcher</Product>
     <Copyright>© 2026 ASTERION VR — All rights reserved</Copyright>
     <RootNamespace>PSLauncher.App</RootNamespace>
-    <Version>0.19.0</Version>
-    <AssemblyVersion>0.19.0.0</AssemblyVersion>
-    <FileVersion>0.19.0.0</FileVersion>
+    <Version>0.20.0</Version>
+    <AssemblyVersion>0.20.0.0</AssemblyVersion>
+    <FileVersion>0.20.0.0</FileVersion>
 
     <!-- Single-file self-contained publish profile (used by `dotnet publish`) -->
     <PublishSingleFile>true</PublishSingleFile>

src/PSLauncher.App/ViewModels/MainViewModel.cs

@@ -53,6 +53,13 @@ public sealed partial class MainViewModel : ObservableObject
     private RemoteManifest? _lastManifest;
     private CancellationTokenSource? _activeDownloadCts;
     private VersionRowViewModel? _activeRow;
+    /// <summary>
+    /// Référence au Task de l'install/DL en cours, exposée aux commandes externes
+    /// (ex. RestartFromZero) qui ont besoin d'attendre la fin réelle des écritures
+    /// disque avant de supprimer le partial. Sinon les segments continuent à écrire
+    /// pendant 1-2 sec après le Cancel() et recréent le fichier qu'on vient de delete.
+    /// </summary>
+    private Task? _activeInstallTask;
 
     public ObservableCollection<VersionRowViewModel> OtherVersions { get; } = new();
 
@@ -333,7 +340,7 @@ public sealed partial class MainViewModel : ObservableObject
     private void WireRowHandlers(VersionRowViewModel row)
     {
         row.LaunchHandler = LaunchVersion;
-        row.InstallHandler = r => _ = InstallVersionAsync(r);
+        row.InstallHandler = r => _activeInstallTask = InstallVersionAsync(r);
         row.UninstallHandler = r => _ = UninstallVersionAsync(r);
         row.ShowReleaseNotesHandler = r => _ = ShowReleaseNotesAsync(r);
         row.OpenFolderHandler = OpenVersionFolder;
@@ -545,12 +552,26 @@ public sealed partial class MainViewModel : ObservableObject
             MessageBoxButton.YesNo, MessageBoxImage.Warning, MessageBoxResult.No);
         if (confirm != MessageBoxResult.Yes) return;
 
-        // Cancel le DL actif si c'est cette row
+        // Cancel le DL actif si c'est cette row, puis attend la propagation complète
+        // (les 16 segments doivent chacun stopper leurs écritures et fermer leur
+        // FileStream sinon DiscardResumableState échouera/sera réécrasé).
         if (_activeRow is not null && _activeRow == row && _activeDownloadCts is not null)
         {
             _activeDownloadCts.Cancel();
-            // Attend la fin de la tâche en cours pour libérer les handles fichier
-            try { await Task.Delay(200); } catch { }
+            // Attend que InstallVersionAsync termine son catch OperationCanceledException
+            // — y compris le flush + state save + libération des FileStream segment.
+            // Timeout de sécurité 10s au cas où une connexion HTTPS bloque sur close.
+            if (_activeInstallTask is { } running && !running.IsCompleted)
+            {
+                StatusMessage = "Annulation en cours…";
+                try
+                {
+                    var awaitTask = await Task.WhenAny(running, Task.Delay(TimeSpan.FromSeconds(10)));
+                    if (!ReferenceEquals(awaitTask, running))
+                        _logger.LogWarning("Install task did not finish cancelling within 10s, proceeding anyway");
+                }
+                catch (Exception ex) { _logger.LogDebug(ex, "Awaiting install task during restart"); }
+            }
         }
 
         _downloadManager.DiscardResumableState(row.Version);
@@ -682,9 +703,13 @@ public sealed partial class MainViewModel : ObservableObject
             row.ProgressPercent = 0;
             var dlProgress = new Progress<DownloadProgress>(p => UpdateDlProgress(row, p));
             // Reporter dédié pour la phase verify SHA-256 (peut prendre 30s-3min sur 14 Go).
-            // On bascule le StatusMessage à ce moment-là pour que l'utilisateur sache ce qui se passe.
+            // On bascule row.State sur Verifying à la première remontée, ce qui change
+            // le badge de la row de "⬇ Téléchargement…" vers "🔍 Vérification…" — les
+            // deux phases sont distinctes côté UX bien que `DownloadAsync` les enchaîne.
             var hashProgress = new Progress<double>(pct =>
             {
+                if (row.State == VersionRowState.Downloading)
+                    row.State = VersionRowState.Verifying;
                 var percent = (int)Math.Round(pct * 100.0);
                 ProgressPercent = percent;
                 row.ProgressPercent = percent;
@@ -879,6 +904,7 @@ public sealed partial class MainViewModel : ObservableObject
             _activeDownloadCts?.Dispose();
             _activeDownloadCts = null;
             _activeRow = null;
+            _activeInstallTask = null;
             IsBusy = false;
         }
     }

src/PSLauncher.App/ViewModels/VersionRowViewModel.cs

@@ -10,6 +10,7 @@ public enum VersionRowState
     InstalledIdle,        // Installée localement, pas d'action en cours
     AvailableIdle,        // Disponible côté serveur, pas installée
     Downloading,
+    Verifying,            // SHA-256 du ZIP téléchargé en cours
     Installing,
     Uninstalling,
 }
@@ -77,13 +78,17 @@ public sealed partial class VersionRowViewModel : ObservableObject
 
     public bool IsInstalled => State is VersionRowState.InstalledIdle or VersionRowState.Uninstalling;
     public bool IsRemoteOnly => State is VersionRowState.AvailableIdle;
-    public bool IsBusy => State is VersionRowState.Downloading or VersionRowState.Installing or VersionRowState.Uninstalling;
+    public bool IsBusy => State is VersionRowState.Downloading
+                                or VersionRowState.Verifying
+                                or VersionRowState.Installing
+                                or VersionRowState.Uninstalling;
 
     public string StateLabel => State switch
     {
         VersionRowState.InstalledIdle => Strings.StatusInstalled,
         VersionRowState.AvailableIdle => Strings.StatusAvailable,
         VersionRowState.Downloading   => Strings.StatusDownloading,
+        VersionRowState.Verifying     => Strings.StatusVerifying,
         VersionRowState.Installing    => Strings.StatusInstalling,
         VersionRowState.Uninstalling  => Strings.StatusUninstalling,
         _ => string.Empty

src/PSLauncher.Core/Localization/Strings.cs

@@ -95,6 +95,7 @@ public static class Strings
     public static string StatusDownloading  => T("⬇ Téléchargement…",    "⬇ Downloading…",       "⬇ 下载中…",    "⬇ กำลังดาวน์โหลด…",  "⬇ جارٍ التنزيل…");
     public static string StatusInstalling   => T("📦 Installation…",     "📦 Installing…",       "📦 安装中…",   "📦 กำลังติดตั้ง…",    "📦 جارٍ التثبيت…");
     public static string StatusUninstalling => T("🗑 Suppression…",      "🗑 Uninstalling…",     "🗑 卸载中…",   "🗑 กำลังถอนการติดตั้ง…", "🗑 جارٍ الإزالة…");
+    public static string StatusVerifying    => T("🔍 Vérification…",     "🔍 Verifying…",        "🔍 校验中…",   "🔍 กำลังตรวจสอบ…",     "🔍 جارٍ التحقق…");
 
     // ==================== ACTIONS ====================
     public static string ActionLaunch       => T("▶  Lancer",       "▶  Launch",       "▶  启动", "▶  เปิด",     "▶  تشغيل");

src/PSLauncher.Updater/PSLauncher.Updater.csproj

@@ -8,7 +8,7 @@
     <LangVersion>latest</LangVersion>
     <AssemblyName>PS_Launcher.Updater</AssemblyName>
     <RootNamespace>PSLauncher.Updater</RootNamespace>
-    <Version>0.19.0</Version>
+    <Version>0.20.0</Version>
     <ApplicationIcon>..\PSLauncher.App\Resources\favicon.ico</ApplicationIcon>
     <Company>ASTERION VR</Company>
     <Copyright>© 2026 ASTERION VR — All rights reserved</Copyright>