Dart APIsettings_listSettingsListSliveronSelectPrivacy onSelectPrivacy property Null safety VoidCallback onSelectPrivacy final Implementation final VoidCallback onSelectPrivacy; unself_settings_list settings_list SettingsListSliver onSelectPrivacy property SettingsListSliver class Constructors SettingsListSliver Properties children hashCode key onSelectAppearance onSelectData onSelectFeedback onSelectLicense onSelectPrivacy onSelectTerms runtimeType Methods build createElement debugDescribeChildren debugFillProperties noSuchMethod toDiagnosticsNode toString toStringDeep toStringShallow toStringShort Operators operator ==