maintainSemantics property Null safety
Whether to maintain the semantics for the widget when it is hidden (e.g. for accessibility).
To set this, maintainSize must also be set.
By default, with maintainSemantics set to false, the child is not visible to accessibility tools when it is hidden from the user. If this flag is set to true, then accessibility tools will report the widget as if it was present.
final bool maintainSemantics;