maintainSemantics property
final
Whether to maintain the semantics for the sliver when it is hidden (e.g. for accessibility).
To set this, maintainSize must also be set.
By default, with maintainSemantics set to false, the sliver 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.
Implementation
final bool maintainSemantics;