Major 2 problems:
#1 A view is handled in the down() callback, however, as RSVP is usually at the top of the stack, this is never called !
SOLUTION: handle the view callback in up().
#2 In down(), if we create an Entry with
{A,B,C,D}, but - before we add it to the ids hashmap - a new view
{A,B,C} is installed, Entry will never get updated.
SOLUTION: update the Entry after adding it to the ids hashmap
