[tor-bugs] #24367 [Core Tor/Tor]: Changes pluggable transports (during start-up) in Tor Browser is broken

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#24367: Changes pluggable transports (during start-up) in Tor Browser is broken
------------------------------+--------------------------------
     Reporter:  gk            |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.2.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 The fix for #23347 made bridges work again in tor but did not fully fix
 the problem/introduced a new issue: changing pluggable transports during
 start-up of Tor Browser is broken. Steps to reproduce are:

 1) Start Tor Browser and select e.g. `obfs3` as a transport
 2) Before finally connecting, click the `Cancel` button
 3) Reconfigure the censorship bypass settings and choose, e.g. `obfs4`
 4) Resume starting. This time you might get an error (indicating that it's
 still an obfs3 bridge your tor wants to connect to) and/or just a stalled
 bootstrap process.

 Even worse, after quitting the browser and restarting the start-up process
 is still broken: it does not proceed and one only gets
 {{{
 Nov 21 11:55:59.000 [notice] Ignoring directory request, since no bridge
 nodes are available yet.
 }}}
 messages in the terminal.

 The first bad commit is 93a8ed3b83b5f20768562ca2aff4eba7aca667d8.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24367>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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