useSnapshotLoading property
Whether the previous page's RouteSnapshot may stand in for this widget's loading state while its view model initialises.
Null (the default) means yes, unless buildLoading or
buildLoadingOverlay has been overridden, in which case the custom
loading view is shown instead. Return true or false to decide outright.
Only applies while NavigationLogic.useSnapshotLoading is on and the
route change went through NavigationLogic.
Implementation
@protected
bool? get useSnapshotLoading => null;