backwardsCompatibility property Null safety
This property is deprecated and is false by default.
This is a temporary property and it has been deprecated. App developers are encouraged to opt into the new features by leaving it default (false) and using the foregroundColor and systemOverlayStyle properties as needed.
@Deprecated( 'This property is obsolete and is false by default. ' 'This feature was deprecated after v2.4.0-0.0.pre.', ) final bool? backwardsCompatibility;