When setting duplicate as current, batch save original profile and
duplicate in a single call via profilesToSave. This is to avoid a
double call to willUpdateProfiles() when saving Core Data context.
In order to set current profile to one that has not been persisted
yet (the duplicate), we need to resort to a pendingProfiles map
where to look the duplicate up when setting currentProfileId.
Either way, iOS 14 cannot handle updating a "hot" change in a
presented NavigationLink. Changing currentProfileId binding while
in ProfileView messes up navigation completely (multiple push and
pop events). Avoid.
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