[tor-bugs] #18540 [Nyx]: Detect when ACS doesn't work

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#18540: Detect when ACS doesn't work
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     Reporter:  atagar     |      Owner:  atagar
         Type:  defect     |     Status:  new
     Priority:  Very High  |  Milestone:
    Component:  Nyx        |    Version:
     Severity:  Normal     |   Keywords:  curses
Actual Points:             |  Parent ID:
       Points:             |   Reviewer:
      Sponsor:             |
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 Probably the most common annoying visual bug I've seen is broken curses
 ACS support. This causes us to show 'mwqqqqqqqqqqqqq' for window
 borders...

 [[Image(https://www.atagar.com/transfer/tmp/acs_error.png)]]

 We can sidestep this by showing ASCII pipes instead ('+--------+'), but to
 do that we need to be able to **detect** when ACS is broken. Thus far I'm
 not sure how to do this - tips welcome...

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18540>
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