Fix crash when attempting to change application whitelist (#305)

LightBulb/Views/Components/Settings/ApplicationWhitelistSettingsTabView.axaml.cs

@@ -42,10 +42,25 @@ private void UserControl_OnLoaded(object? sender, RoutedEventArgs args)
  private void WhitelistedApplicationsListBox_OnSelectionChanged(
  object? sender,
  SelectionChangedEventArgs args
- ) =>
- DataContext.WhitelistedApplications = WhitelistedApplicationsListBox
+ )
+ {
+ var applications = WhitelistedApplicationsListBox
  .SelectedItems?.Cast<ExternalApplication>()
  .ToArray();
 
+ // Don't update the view model if the list hasn't changed.
+ // This is important to avoid potential infinite loops.
+ if (
+ applications is not null
+ && DataContext.WhitelistedApplications is not null
+ && applications.SequenceEqual(DataContext.WhitelistedApplications)
+ )
+ {
+ return;
+ }
+
+ DataContext.WhitelistedApplications = applications;
+ }
+
  public void Dispose() => _eventRoot.Dispose();
 }