The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Nullability of reference types in type of parameter 'parameter' of 'bool CommandHelper.CanExecute(object parameter)' doesn't match implicitly implemented member 'bool ICommand.CanExecute(object? parameter)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'parameter' of 'void CommandHelper.Execute(object parameter)' doesn't match implicitly implemented member 'void ICommand.Execute(object? parameter)' (possibly because of nullability attributes).

Nullability of reference types in type of 'event EventHandler CommandHelper.CanExecuteChanged' doesn't match implicitly implemented member 'event EventHandler? ICommand.CanExecuteChanged'.

Nullability of reference types in type of 'event PropertyChangedEventHandler ViewModelBase.PropertyChanged' doesn't match implicitly implemented member 'event PropertyChangedEventHandler? INotifyPropertyChanged.PropertyChanged'.

'IconButton.ContentProperty' hides inherited member 'ContentControl.ContentProperty'. Use the new keyword if hiding was intended.

'IconButton.BackgroundProperty' hides inherited member 'Control.BackgroundProperty'. Use the new keyword if hiding was intended.

'IconButton.Content' hides inherited member 'ContentControl.Content'. Use the new keyword if hiding was intended.

'IconButton.Background' hides inherited member 'Control.Background'. Use the new keyword if hiding was intended.

Possible null reference return.