[tor-bugs] #21928 [Applications/Tor Browser]: Force a reinstall if an existing hardened bundle is present.

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#21928: Force a reinstall if an existing hardened bundle is present.
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     Reporter:  yawning                   |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:  #21912
       Points:                            |   Reviewer:
      Sponsor:                            |
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 More tasks related to #21912.

 Since there's no good way for `sandboxed-tor-browser` to handle channels
 being removed, the solution I'm going for is to force a re-install if an
 existing `hardened` bundle is present.

 Some minor UI work is probably required since this will obliterate user
 data.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21928>
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