Dart APIunself_componentUnSliverAppBarisImmersive isImmersive property Null safety bool isImmersive final Implementation final bool isImmersive; unself_component unself_component UnSliverAppBar isImmersive property UnSliverAppBar class Constructors UnSliverAppBar Properties description emoji hashCode implyLeading isCollapseCentered isImmersive key leading runtimeType title trailing Methods createElement createState debugDescribeChildren debugFillProperties noSuchMethod toDiagnosticsNode toString toStringDeep toStringShallow toStringShort Operators operator ==