This class implements a filter for sorting a photo collection by specific criteria. In practice, it creates a copy of the collection, sorts it and listens to change events from the original colelction. If it is changed, the sorted copy is also recreated.
The sorting order can be defined using a Comparator object that is capable of Comparing PhotoInfo objects. The default is to order photos according to their ID.
@author Harri Kaimio
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