[MacPorts] #48807: python messes with terminal state on exit

[MacPorts]

#48807: python messes with terminal state on exit
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  Reporter:  yselivanov@…                        |      Owner:
                                                 |  jyrkiwahlstedt
      Type:  defect                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:  2.3.3
Resolution:                                      |   Keywords:  haspatch
      Port:  python26 python27 python python34   |
  python35 python36 libedit                      |
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Comment (by jmroot):

 Further findings:
  * I'm leaning towards the missing deprep being a bug in libedit's
 readline emulation. The readline docs say that rl_callback_handler_install
 will prep the terminal and rl_callback_handler_remove will deprep it. They
 are silent on whether an explicit call to rl_prep_terminal should need a
 matching call to rl_deprep_terminal, but the actual behaviour of readline
 is that it does not, so that's what libedit should emulate.
  * What's going in with the prompt is that after a line is entered by the
 user, libedit prints a new prompt before python has a chance to print its
 output. Just using the readline() function doesn't have this issue, only
 the callback-based API. I'm attaching a reduced test program.

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Ticket URL: <https://trac.macports.org/ticket/48807#comment:137>
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