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

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