bug#30190: 27.0.50; term run in line mode shows user passwords

[Noam Postavsky]

Stefan Monnier <monnier@IRO.UMontreal.CA> writes:

> unconditionally call *-watch-for-password-prompt right at the place
> where you added the "run-hook" (actually, only one of the two places),

Here is a modified version of Tino's patch which uses comint.el and does
the above.  Another difference is that we call
term-watch-for-password-prompt on the decoded-substring (I believe
that's required to match localized non-ASCII prompts correctly).

I wasn't able to reproduce the problems described in #74 with any
version of the patch (maybe it's dependent on timing?), so I'm not sure
how much of a concern that is.

v3-0001-Prevent-line-mode-term-from-showing-user-password.patch
Description: patch