Node.js 20 actions are deprecated. The following actions are running on Node.js 20 and may not work as expected: actions/checkout@v4, actions/setup-dotnet@v4, actions/upload-artifact@v4, nick-fields/retry@v3. Actions will be forced to run with Node.js 24 by default starting June 2nd, 2026. Node.js 20 will be removed from the runner on September 16th, 2026. Please check if updated versions of these actions are available that support Node.js 24. To opt into Node.js 24 now, set the FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true environment variable on the runner or in your workflow file. Once Node.js 24 becomes the default, you can temporarily opt out by setting ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Possible null reference assignment.

Argument of type 'AnonymousObserver<Control>' cannot be used for parameter 'observer' of type 'IObserver<Control?>' in 'IDisposable IObservable<Control?>.Subscribe(IObserver<Control?> observer)' due to differences in the nullability of reference types.

Nullability of reference types in type of parameter 'sender' of 'void SmoothScrollViewer.OnKeyDown(object sender, KeyEventArgs e)' doesn't match the target delegate 'EventHandler<KeyEventArgs>' (possibly because of nullability attributes).

Argument of type 'AnonymousObserver<Control>' cannot be used for parameter 'observer' of type 'IObserver<Control?>' in 'IDisposable IObservable<Control?>.Subscribe(IObserver<Control?> observer)' due to differences in the nullability of reference types.

Possible null reference argument for parameter 'name' in 'Theme.Theme(string name, ThemeVariant? themeVariant)'.

Nullability of reference types in type of parameter 'sender' of 'void PleasantTheme.CustomThemesOnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)' doesn't match the target delegate 'NotifyCollectionChangedEventHandler' (possibly because of nullability attributes).

'ModalWindowHost.VerticalContentAlignment' hides inherited member 'ContentControl.VerticalContentAlignment'. Use the new keyword if hiding was intended.

'ModalWindowHost.HorizontalContentAlignment' hides inherited member 'ContentControl.HorizontalContentAlignment'. Use the new keyword if hiding was intended.

'ModalWindowHost.VerticalContentAlignmentProperty' hides inherited member 'ContentControl.VerticalContentAlignmentProperty'. Use the new keyword if hiding was intended.