Comment 2 for bug 641968

IMHO our current understanding of LeastRecentActor is wrong...
Let's assume we have sequential events. (The actors are defined by numbers)

2, 1, 3, 2, 1, 4

So we have 4 different actors (1,2,3,4) and we want to sort them by least recent.
the least recent is not 2 or 1 since they are used again at the end. the least recent is 3

This means LeastRecentActors should return the latest actors sorted ASC:

3, 2, 1, 4

and not

2, 1, 3, 4

MostRecentActors should return the same last 4 files but in reversed sorting:

4, 3, 1, 2