Fix flickering on item selection and context menus.

Wino.Mail.WinUI/Views/MailListPage.xaml

@@ -72,6 +72,7 @@
                     x:DefaultBindMode="OneWay"
                     CenterHoverAction="{Binding ElementName=root, Path=ViewModel.PreferencesService.CenterHoverAction, Mode=OneWay}"
                     ContextRequested="MailItemContextRequested"
+                    DataContext="{x:Bind}"
                     DisplayMode="{Binding ElementName=root, Path=ViewModel.PreferencesService.MailItemDisplayMode, Mode=OneWay}"
                     HoverActionExecutedCommand="{Binding ElementName=root, Path=ViewModel.ExecuteHoverActionCommand}"
                     IsAvatarVisible="{Binding ElementName=root, Path=ViewModel.PreferencesService.IsShowSenderPicturesEnabled, Mode=OneWay}"
@@ -112,6 +113,7 @@
                         x:DefaultBindMode="OneWay"
                         CenterHoverAction="{Binding ElementName=root, Path=ViewModel.PreferencesService.CenterHoverAction, Mode=OneWay}"
                         ContextRequested="MailItemContextRequested"
+                        DataContext="{x:Bind}"
                         DisplayMode="{Binding ElementName=root, Path=ViewModel.PreferencesService.MailItemDisplayMode, Mode=OneWay}"
                         HoverActionExecutedCommand="{Binding ElementName=root, Path=ViewModel.ExecuteHoverActionCommand}"
                         IsAvatarVisible="{Binding ElementName=root, Path=ViewModel.PreferencesService.IsShowSenderPicturesEnabled, Mode=OneWay}"

Wino.Mail.WinUI/Views/MailListPage.xaml.cs

@@ -540,9 +540,9 @@ public sealed partial class MailListPage : MailListPageAbstract,
     private void ListSelectionChanged(ItemsView sender, ItemsViewSelectionChangedEventArgs args)
     {
         UpdateSelectAllButtonStatus();
-        UpdateAdaptiveness();
-
         SynchronizeSelectedItems();
+
+        UpdateAdaptiveness();
     }
 
     private static object _selectedItemsLock = new object();

Wino.Mail.WinUI/Views/MailRenderingPage.xaml.cs

@@ -121,6 +121,10 @@ public sealed partial class MailRenderingPage : MailRenderingPageAbstract,
     {
         base.OnNavigatedFrom(e);
 
+        WeakReferenceMessenger.Default.Unregister<HtmlRenderingRequested>(this);
+        WeakReferenceMessenger.Default.Unregister<CancelRenderingContentRequested>(this);
+        WeakReferenceMessenger.Default.Unregister<ApplicationThemeChanged>(this);
+
         // Disposing the page.
         // Make sure the WebView2 is disposed properly.
 
@@ -150,6 +154,10 @@ public sealed partial class MailRenderingPage : MailRenderingPageAbstract,
     {
         base.OnNavigatedTo(e);
 
+        WeakReferenceMessenger.Default.Register<HtmlRenderingRequested>(this);
+        WeakReferenceMessenger.Default.Register<CancelRenderingContentRequested>(this);
+        WeakReferenceMessenger.Default.Register<ApplicationThemeChanged>(this);
+
         var anim = ConnectedAnimationService.GetForCurrentView().GetAnimation("WebViewConnectedAnimation");
         anim?.TryStart(Chromium);