[MacPorts] #53404: `port upgrade outdated` changes colours in terminal emulation

[MacPorts]

#53404: `port upgrade outdated` changes colours in terminal emulation
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  Reporter:  ballapete  |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:
Resolution:             |   Keywords:
      Port:             |
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Comment (by ballapete):

 Replying to [comment:4 raimue]:
 > That answers one part of my question. Is this Terminal.app?

 No, it's the `*shell* buffer inside `GNU Emacs`.
 >
 > `TERM=dumb` is not a sane choice. I wonder where this comes from in your
 setup. Usually, it should be `TERM=xterm` or `TERM=xterm-256color`,
 matching the capabilities of the terminal emulator.

 Since `GNU Emacs` performs a lot of things inside that buffer it's not
 really efficient when `GNU Emacs` and some thought smart shell try to
 perform nifty things. IMO `GNU Emacs` performs pretty well. If not better
 …

 There is also a more `ANSI conforming` terminal emulation, the `*ansi-term
 buffer*`. Its TERM is set to `eterm-color`. Next week, when some installed
 ports might have been upgraded, I can try to see how this mode performs.

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Ticket URL: <https://trac.macports.org/ticket/53404#comment:5>
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