Fix delete key executing twice on mail list.

Wino.Mail/Controls/Advanced/WinoListView.cs

@@ -405,6 +405,15 @@ namespace Wino.Controls.Advanced
             {
                 internalScrollviewer.ViewChanged -= InternalScrollVeiwerViewChanged;
             }
+
+            foreach (var item in Items)
+            {
+                if (item is ThreadMailItemViewModel threadMailItemViewModel)
+                {
+                    var threadListView = GetThreadInternalListView(threadMailItemViewModel);
+                    threadListView?.Dispose();
+                }
+            }
         }
     }
 }

Wino.Mail/Views/MailListPage.xaml

@@ -181,7 +181,6 @@
                                 IsThreadListView="True"
                                 ItemTemplate="{StaticResource ThreadSingleMailItemTemplate}"
                                 ItemsSource="{x:Bind ThreadItems}"
-                                ProcessKeyboardAccelerators="ProcessMailItemKeyboardAccelerator"
                                 ScrollViewer.VerticalScrollBarVisibility="Hidden">
                                 <ListView.ItemContainerTransitions>
                                     <TransitionCollection>
@@ -438,7 +437,6 @@
                                 ItemTemplateSelector="{StaticResource MailItemDisplaySelector}"
                                 ItemsSource="{x:Bind MailCollectionViewSource.View, Mode=OneWay}"
                                 LoadMoreCommand="{x:Bind ViewModel.LoadMoreItemsCommand}"
-                                ProcessKeyboardAccelerators="ProcessMailItemKeyboardAccelerator"
                                 ScrollViewer.VerticalScrollBarVisibility="Auto">
                                 <ListView.ItemContainerTransitions>
                                     <TransitionCollection>

Wino.Mail/Views/MailListPage.xaml.cs

@@ -62,6 +62,10 @@ namespace Wino.Views
         {
             base.OnNavigatedFrom(e);
 
+            // Dispose all WinoListView items.
+
+            MailListView.Dispose();
+
             this.Bindings.StopTracking();
 
             RenderingFrame.Navigate(typeof(IdlePage));
@@ -347,16 +351,6 @@ namespace Wino.Views
             SearchBar.PlaceholderText = Translator.SearchBarPlaceholder;
         }
 
-        private void ProcessMailItemKeyboardAccelerator(UIElement sender, ProcessKeyboardAcceleratorEventArgs args)
-        {
-            if (args.Key == Windows.System.VirtualKey.Delete)
-            {
-                args.Handled = true;
-
-                ViewModel?.ExecuteMailOperationCommand?.Execute(MailOperation.SoftDelete);
-            }
-        }
-
         /// <summary>
         /// Thread header is mail info display control and it can be dragged spearately out of ListView.
         /// We need to prepare a drag package for it from the items inside.