alternative-delta-fix cherry pick (#4178)

Author: Udumft

CHANGELOG.md

@@ -78,6 +78,7 @@
 * Routes now respect conditional access restrictions that depend on the year. ([#4144](https://github.com/mapbox/mapbox-navigation-ios/pull/4144))
 * Routes now respect conditional access restrictions that apply to [all vehicles](https://wiki.openstreetmap.org/wiki/Key:vehicle). ([#4144](https://github.com/mapbox/mapbox-navigation-ios/pull/4144))
 * Fixed an issue where the `Intersection.outletRoadClasses` and `Intersection.outletMapboxStreetsRoadClass` properties were set to `RoadClasses.restricted` for an entrance to a rest area because of its “[local traffic only](https://wiki.openstreetmap.org/wiki/Tag:access%3Ddestination)” restriction. ([#4144](https://github.com/mapbox/mapbox-navigation-ios/pull/4144))
+* Fixed an issue where continuous alternative time travel delta was displayed as 0 in a callout after manually switching to an alternative route. ([#4177](https://github.com/mapbox/mapbox-navigation-ios/pull/4177))
 
 ### CarPlay
 

Sources/MapboxCoreNavigation/RouteController.swift

@@ -281,7 +281,8 @@ open class RouteController: NSObject {
 
         let encoder = JSONEncoder()
         encoder.userInfo[.options] = routeOptions
-        guard let routeData = try? encoder.encode(indexedRouteResponse.routeResponse),
+        guard let newMainRoute = indexedRouteResponse.currentRoute,
+              let routeData = try? encoder.encode(indexedRouteResponse.routeResponse),
               let routeJSONString = String(data: routeData, encoding: .utf8) else {
                   completion?(.failure(RouteControllerError.failedToSerializeRoute))
                   return
@@ -305,7 +306,7 @@ open class RouteController: NSObject {
                 switch result {
                 case .success(let info):
                     let alternativeRoutes = info.1.compactMap {
-                        AlternativeRoute(mainRoute: self.route,
+                        AlternativeRoute(mainRoute: newMainRoute,
                                          alternativeRoute: $0)
                     }
                     completion?(.success((info.0, alternativeRoutes)))