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cde14a5788
Currently, a view update backlog may reach an invalid state, when its max is 0 and its relative_size() is NaN as a result. This can be achieved either by constructing the backlog with a 0 max or by modifying the max of an existing backlog. In particular, this happens when creating the backlog using the default constructor. In this patch the the default constructor is deleted and a check is added to make sure that the max is different than 0 is added to its constructor - if the check fails, we construct an empty backlog instead, to handle the possibility of getting an invalid backlog sent from a node with a version that's missing this check. Additionally, we make the backlogs members private, exposing them only through const getters.