pinentry-tty: Line editing support (just like --loopback-mode)?

[NIIBE Yutaka]

Hello,

For the bug report of https://dev.gnupg.org/T4583 , I realized
that line editing of password is not supported well.

I think that in pinentry-tty, line editing should be supported just like
what GnuPG's does with tty_get_hidden function (only disabling echo, but
keep enabling line editing by ICANON).

I'm asking, because it will be a major change: it will be impossible for
a user of pinentry-tty to input some (control) characters.  When a user
intentionally uses some (control) characters on purpose, and that's a
reason why the user uses pinentry-tty, it will be a regression.


Well, on a System V R3 machine, I once changed my password to include
'#' character in a user session.  After logout of the session... In the
TTY discipline at the login prompt, '#' was the erase character.  So, I
lost a way to input my password.  (IIRC, there was no lnext character
support.)  It was more than 20 years ago...
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