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

[boon]

Coming first to \e[?40h ...

a) I grepped the VT2xx manual.

b) I browsed the VT5xx manual.

c) I tested it on a real VT5xx terminal.

d) I happened to find it documented in "man 5 dtterm" on a particular
flavour of Unix. (dtterm was/is an X-windows terminal emulator.)

I am highly confident that the above escape sequence is an invention of
emulators and never existed with the function ascribed to it in a real
terminal. (That doesn't preclude the possibility that the escape
sequence does have some other, undocumented, function in a real
terminal, which function was not evident to me. Hence it is not ideal to
send the escape sequence blindly to all terminals.)

I am not after a change to its behaviour. In fact the only thing wrong
with it is that it defaults the wrong way, causing the emulated terminal
to fail to be compatible with the real thing. However I am not even
after fixing the default. It is too late. Changing the default now would
be broken just as having the default wrong in the first place was
broken.

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https://bugs.launchpad.net/bugs/1297051

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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