Fixing some IsBusy corner cases.

.github/copilot-instructions.md

@@ -100,6 +100,7 @@ _dialogService.InfoBarMessage(Translator.Info_MissingFolderTitle, message);
 - **NEVER** create IValueConverter classes or add them to Converters.xaml
 - **NEVER** use BoolToVisibilityConverter - WinUI 3 SDK automatically converts bool to Visibility
 - Direct binding: `Visibility="{x:Bind IsVisible, Mode=OneWay}"`
+- Register control events (for example `Loaded`, `Unloaded`, `SizeChanged`, `PointerEntered`) in XAML markup, not with `+=` in `.xaml.cs`.
 
 ### XamlHelpers for Complex Conversions
 - **ALWAYS** use XamlHelpers static methods instead of converters

Wino.Core.Domain/Interfaces/IMailItemDisplayInformation.cs

@@ -22,7 +22,6 @@ public interface IMailItemDisplayInformation : INotifyPropertyChanged
     DateTime CreationDate { get; }
     string Base64ContactPicture { get; }
     bool ThumbnailUpdatedEvent { get; }
-    bool IsBusy { get; }
     bool IsThreadExpanded { get; }
     AccountContact SenderContact { get; }
 }

Wino.Mail.ViewModels/Data/IMailListItem.cs

@@ -32,6 +32,11 @@ public interface IMailListItem : IMailHashContainer, IMailListItemSorting, INoti
     /// </summary>
     bool IsSelected { get; set; }
 
+    /// <summary>
+    /// Gets whether this item is currently processing a network operation.
+    /// </summary>
+    bool IsBusy { get; }
+
     /// <summary>
     /// Gets all selected mail items within this list item.
     /// For MailItemViewModel: returns itself if IsSelected is true, otherwise empty

Wino.Mail.WinUI/Controls/MailItemDisplayInformationControl.xaml

@@ -19,7 +19,8 @@
     FocusVisualSecondaryBrush="{StaticResource SystemControlFocusVisualSecondaryBrush}"
     FocusVisualSecondaryThickness="1"
     PointerEntered="ControlPointerEntered"
-    PointerExited="ControlPointerExited">
+    PointerExited="ControlPointerExited"
+    Unloaded="OnUnloaded">
 
     <UserControl.Resources>
         <Style
@@ -59,7 +60,8 @@
                 Background="Transparent"
                 BorderBrush="Transparent"
                 BorderThickness="0.5"
-                CornerRadius="4" />
+                CornerRadius="4"
+                SizeChanged="RootContainerVisualWrapperSizeChanged" />
 
             <Grid x:Name="MainContentContainer">
                 <Grid.ColumnDefinitions>
@@ -247,7 +249,7 @@
                                     Height="3"
                                     HorizontalAlignment="Right"
                                     VerticalAlignment="Bottom"
-                                    IsActive="{x:Bind MailItemInformation.IsBusy, Mode=OneWay}" />
+                                    IsActive="{x:Bind ActionItem.IsBusy, Mode=OneWay, FallbackValue=False}" />
                             </StackPanel>
                         </Grid>
                     </Grid>

Wino.Mail.WinUI/Controls/MailItemDisplayInformationControl.xaml.cs

@@ -1,4 +1,5 @@
 using System;
+using System.ComponentModel;
 using System.Linq;
 using System.Numerics;
 using CommunityToolkit.WinUI;
@@ -26,6 +27,8 @@ public sealed partial class MailItemDisplayInformationControl : UserControl
     private Compositor? _compositor;
     private Visual? _contentVisual;
     private ScalarKeyFrameAnimation? _opacityAnimation;
+    private SpriteVisual? _leftBackgroundVisual;
+    private INotifyPropertyChanged? _actionItemPropertySource;
 
     [GeneratedDependencyProperty(DefaultValue = MailListDisplayMode.Spacious)]
     public partial MailListDisplayMode DisplayMode { get; set; }
@@ -83,8 +86,8 @@ public sealed partial class MailItemDisplayInformationControl : UserControl
 
         var compositor = this.Visual().Compositor;
 
-        var leftBackgroundVisual = compositor.CreateSpriteVisual();
+        _leftBackgroundVisual = compositor.CreateSpriteVisual();
-        RootContainerVisualWrapper.SetChildVisual(leftBackgroundVisual);
+        RootContainerVisualWrapper.SetChildVisual(_leftBackgroundVisual);
         MainContentContainer.EnableImplicitAnimation(VisualPropertyType.Offset, 400);
 
         RootContainer.EnableImplicitAnimation(VisualPropertyType.Offset, 400);
@@ -92,8 +95,6 @@ public sealed partial class MailItemDisplayInformationControl : UserControl
         ContentStackpanel.EnableImplicitAnimation(VisualPropertyType.Offset, 400);
         IconsContainer.EnableImplicitAnimation(VisualPropertyType.Offset, 400);
 
-        RootContainerVisualWrapper.SizeChanged += (s, e) => leftBackgroundVisual.Size = e.NewSize.ToVector2();
-
         // Initialize shimmer effect compositor
         _compositor = this.Visual().Compositor;
     }
@@ -108,6 +109,23 @@ public sealed partial class MailItemDisplayInformationControl : UserControl
         UpdateBusyAnimationState();
     }
 
+    partial void OnActionItemPropertyChanged(DependencyPropertyChangedEventArgs e)
+    {
+        if (_actionItemPropertySource != null)
+        {
+            _actionItemPropertySource.PropertyChanged -= ActionItemPropertyChanged;
+            _actionItemPropertySource = null;
+        }
+
+        if (e.NewValue is INotifyPropertyChanged propertyChangedSource)
+        {
+            _actionItemPropertySource = propertyChangedSource;
+            _actionItemPropertySource.PropertyChanged += ActionItemPropertyChanged;
+        }
+
+        UpdateBusyAnimationState();
+    }
+
     private void StartBusyAnimation()
     {
         if (_compositor == null) return;
@@ -144,7 +162,7 @@ public sealed partial class MailItemDisplayInformationControl : UserControl
 
     private void UpdateBusyAnimationState()
     {
-        if (MailItemInformation?.IsBusy == true)
+        if (ActionItem?.IsBusy == true)
         {
             StartBusyAnimation();
             return;
@@ -153,6 +171,33 @@ public sealed partial class MailItemDisplayInformationControl : UserControl
         StopBusyAnimation();
     }
 
+    private void ActionItemPropertyChanged(object? sender, PropertyChangedEventArgs e)
+    {
+        if (string.IsNullOrEmpty(e.PropertyName) || e.PropertyName == nameof(IMailListItem.IsBusy))
+        {
+            UpdateBusyAnimationState();
+        }
+    }
+
+    private void OnUnloaded(object sender, RoutedEventArgs e)
+    {
+        if (_actionItemPropertySource != null)
+        {
+            _actionItemPropertySource.PropertyChanged -= ActionItemPropertyChanged;
+            _actionItemPropertySource = null;
+        }
+
+        StopBusyAnimation();
+    }
+
+    private void RootContainerVisualWrapperSizeChanged(object sender, SizeChangedEventArgs e)
+    {
+        if (_leftBackgroundVisual != null)
+        {
+            _leftBackgroundVisual.Size = e.NewSize.ToVector2();
+        }
+    }
+
     private void ControlPointerEntered(object sender, Microsoft.UI.Xaml.Input.PointerRoutedEventArgs e)
     {
         if (IsHoverActionsEnabled)