[tor-bugs] #20826 [Core Tor/Tor]: Restrict GUARDS set to EntryNodes when the set of guards is restrictive

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#20826: Restrict GUARDS set to EntryNodes when the set of guards is restrictive
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     Reporter:  nickm         |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.0.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #20822
       Points:                |   Reviewer:
      Sponsor:                |
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 In proposal 271, I suggested that when EntryNodes is a very restrictive
 set, we should use it, rather than GUARDS, to build our sample.

 We already support having a separate guard selection here in the new guard
 code (see #19888), but we don't restrict the GUARDS input set in the way I
 had suggested yet.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20826>
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