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

[Tino Calancha]

> Here is a modified version of Tino's patch which uses comint.el and does
> the above.
Thank you Noam!  Very happy to see this.
The patch hide my password nicely :-)
> 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).
Good observation.

> 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.
I follow the recipe in my video and I cannot reproduce the funny issue 
mentioned there either.