[routing] Cross mwm mix handling for iOS

iphone/Maps/Classes/CustomAlert/DownloadTransitMapsAlert/MWMDownloadTransitMapAlert.mm

@@ -118,7 +118,7 @@ CGFloat const kAnimationDuration = .05;
   auto const & s = GetFramework().GetStorage();
   m_countries.erase(
       remove_if(m_countries.begin(), m_countries.end(),
-                [&s](TCountryId const & countryId) { return s.IsNodeDownloaded(countryId); }),
+                [&s](TCountryId const & countryId) { return s.HasLatestVersion(countryId); }),
       m_countries.end());
   NSMutableArray<NSString *> * titles = [@[] mutableCopy];
   TMwmSize totalSize = 0;

storage/storage.cpp

@@ -1252,6 +1252,11 @@ bool Storage::IsNodeDownloaded(TCountryId const & countryId) const
   return false;
 }
 
+bool Storage::HasLatestVersion(TCountryId const & countryId) const
+{
+  return CountryStatusEx(countryId) == Status::EOnDisk;
+}
+
 void Storage::DownloadNode(TCountryId const & countryId)
 {
   ASSERT_THREAD_CHECKER(m_threadChecker, ());

storage/storage.hpp

@@ -373,6 +373,9 @@ public:
   /// and World.mwm and WorldCoasts.mwm.
   bool IsNodeDownloaded(TCountryId const & countryId) const;
 
+  /// \brief Returns true if the last version of countryId has been downloaded.
+  bool HasLatestVersion(TCountryId const & countryId) const;
+
   /// \brief Gets all the attributes for a node by its |countryId|.
   /// \param |nodeAttrs| is filled with attributes in this method.
   void GetNodeAttrs(TCountryId const & countryId, NodeAttrs & nodeAttrs) const;