useTextSelectionTheme property Null safety
A temporary flag that was used to opt-in to the new TextSelectionTheme during the migration to this new theme. That migration is now complete and this flag is not longer used by the framework. Please remove any reference to this property, as it will be removed in future releases.
@Deprecated( 'No longer used by the framework, please remove any reference to it. ' 'This feature was deprecated after v1.23.0-4.0.pre.', ) final bool useTextSelectionTheme;