We discussed this issue on IRC, a summary:
 * the current definition of LeastRecentActors is wrong, it should be 
"application I have not used for the longest time"
 * we need a new ResultType for the old definition ("The first event of each 
different actor"), something like OldestActor

The plan to fix this bug is:
 1.) Fix the initial issue described in bug 641968 (LeastRecentActors is not 
working together with templates)
 2.) land the fix for 1.) in lp:zeitgeist
 3.) rename LeastRecentActor into something like OldestActor (we still need a 
smart name for this)
 4.) reimplement LeastRecentActor to return the result as descibed in the 
various examples here
 5.) land 3.) and 4.) to lp:zeitgeist at the same time

Wrong understanding of the LeastRecentActors
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Status in Zeitgeist Framework: New

Bug description:
In an attempt to work on bug #641968 I discovered that we some of us defer on 
the understanding of LeastRecentActor

The documentation stated that LeastRecentActor = enum_factory(("The first event 
of each different actor"))

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 
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

When we look at LeastRecentSubjects = enum_factory(("One event for each subject 
only, "
  "ordered with oldest events first"))
My understanding according to Siegfried is:

<seif_> RainCT,
<seif_> LeastRecentSubjects = enum_factory(("One event for each subject only, "
<seif_>   "ordered with oldest events first")
<seif_> so i f i have
<seif_> the subject
<seif_> 1, 2, 1, 3, 4
<seif_> what do i get returned
<seif_> 1, 2, 3, 4
<seif_> or
<seif_> 2, 1, 3, 4
<seif_> ?
<RainCT> seif_: the later
<RainCT> for each subject you only look at the most recent one
<seif_> ok then we should do the same for the actors :)
<RainCT> Yes. Isn't it like this already?
<seif_> no

In that case if we follow this convention I can update the doc strings and 
already have the bug fix for both this bug and #641968

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