[Bug 1297051] Re: gnome-terminal doesn't recognise C1 controls

[boon]

We use answerback extensively in order to identify the make and model of
terminal i.e. every terminal that we have, physical or emulated, is
configured to respond to ENQ with its make and model (followed by a
carriage return).

In an ideal world we would not have to do this because every terminal
emulator would emulate perfectly the make and model of real terminal
that it claims to emulate.

Knowing the actual make and model allows us to account for quirks and
limitations of individual emulations e.g. knowing that I have to send
ESC[?40h for a width change.

Considering that the code bothers to recognise the ENQ - but
deliberately sends no response - even if it just returned the value of
an environment variable that I can set, that would be workable, although
a command line argument or something out of the profile would be better.

Bear in mind that the starting point of this was ... why am I using
PuTTY and what would have to change in gnome-terminal for it to replace
PuTTY? Answerback works in PuTTY.

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Title:
  gnome-terminal doesn't recognise C1 controls

Status in “vte3” package in Ubuntu:
  New

Bug description:
  gnome-terminal seems not to recognise the C1 control characters.

  The particular character that is a problem for me is CSI. However
  there may be a generic issue with non-support of this whole range of
  characters.

  This range of characters should only be recognised when the encoding
  is a character set that is defined to include the C1 control
  characters but, at a quick look, that is all of the ISO-8859-x
  character sets and Unicode. (C1 control characters require encoding as
  a 2 byte sequence when the encoding is UTF-8. As unlikely as this may
  be to occur in practice, UTF-8 is not inconsistent with C1 control
  characters.)

  Part of the motivation for raising this bug report is that PuTTY seems
  to have declined in reliability recently and so I looked at why I am
  using PuTTY as opposed to gnome-terminal. Correct support of C1
  control characters is one reason. This works in PuTTY. It does not
  appear to work in gnome-terminal. Perhaps resources would be better
  spent making gnome-terminal work as well as PuTTY does, rather than
  attempting to get PuTTY fixed.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: gnome-terminal 3.6.1-0ubuntu6
  ProcVersionSignature: Ubuntu 3.11.0-18.32-generic 3.11.10.4
  Uname: Linux 3.11.0-18-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  Date: Tue Mar 25 11:08:00 2014
  InstallationDate: Installed on 2011-10-25 (881 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MarkForUpload: True
  SourcePackage: gnome-terminal
  UpgradeStatus: Upgraded to saucy on 2013-11-08 (136 days ago)

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