Refine WinUI shell and improve render diagnostics

MainWindow.xaml.cs

@@ -2,6 +2,7 @@ using System.Collections.ObjectModel;
 using System.Diagnostics;
 using System.Globalization;
 using System.IO;
+using System.Text;
 using System.Windows;
 using System.Windows.Controls;
 using AmigaDB.VideoRenderer.Models;
@@ -15,8 +16,11 @@ public partial class MainWindow : Window
 {
     private readonly ObservableCollection<string> _inputs = [];
     private readonly AppSettings _loadedSettings;
+    private readonly StringBuilder _pendingLog = new();
+    private readonly object _logLock = new();
     private CancellationTokenSource? _renderCancellation;
     private string? _lastRenderedFile;
+    private bool _logFlushScheduled;
 
     public MainWindow()
     {
@@ -110,7 +114,7 @@ public partial class MainWindow : Window
         catch (Exception exception)
         {
             AppendLog("ERROR: " + exception);
-            MessageBox.Show(this, exception.Message, "Render failed", MessageBoxButton.OK, MessageBoxImage.Error);
+            MessageBox.Show(this, UserFacingErrors.Summarize(exception), "Render failed", MessageBoxButton.OK, MessageBoxImage.Error);
             StageText.Text = "Failed";
         }
         finally
@@ -165,12 +169,6 @@ public partial class MainWindow : Window
     private void InputList_SelectionChanged(object sender, SelectionChangedEventArgs e)
         => PreviewSourceButton.IsEnabled = InputList.SelectedItem is string;
 
-    private void InputList_MouseDoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e)
-    {
-        if (InputList.SelectedItem is string path)
-            OpenPreview(path);
-    }
-
     private void SetRendering(bool rendering)
     {
         RenderButton.IsEnabled = !rendering;
@@ -187,9 +185,29 @@ public partial class MainWindow : Window
 
     private void AppendLog(string line)
     {
-        Dispatcher.Invoke(() =>
+        lock (_logLock)
         {
-            LogBox.AppendText(line + Environment.NewLine);
+            _pendingLog.AppendLine(line);
+            if (_logFlushScheduled)
+                return;
+
+            _logFlushScheduled = true;
+        }
+
+        _ = Dispatcher.BeginInvoke(() =>
+        {
+            string chunk;
+            lock (_logLock)
+            {
+                chunk = _pendingLog.ToString();
+                _pendingLog.Clear();
+                _logFlushScheduled = false;
+            }
+
+            if (chunk.Length == 0)
+                return;
+
+            LogBox.AppendText(chunk);
             LogBox.ScrollToEnd();
         });
     }