didPop method
The Navigator popped route.
The route immediately below that one, and thus the newly active
route, is previousRoute.
Implementation
@override
void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
// Defer ONLY the broad _anyModalDepth decrement; the narrow _modalDepth
// path remains synchronous inside _bumpDown.
_bumpDown(route, deferAnyModal: true);
}