bug#46609: Fix shell password prompt in minibuffer (bug 43302)

[Andreas Schwab <schwab@linux-m68k.org>]

On Feb 18 2021, Lars Ingebrigtsen wrote:

> Ryan Prior <rprior@protonmail.com> writes:
>
>> The current comint-password-prompt-regexp does not tolerate newlines at
>> the end of the prompt, so a string like "Password:\n" will not be
>> recognized as a password prompt in shell-mode. Before Emacs 27
>> (74277b0e881) newlines were tolerated here, so this is a regression, and
>> as a result I would sometimes echo my password in plain text where
>> previously it would be hidden.
>
> Thanks; applied to Emacs 27 with one change:
>
>> +    (when (string-match "[\n]+$" string)
>> +      (setq string (replace-match "" t t string)))
>
> This should probably be "\n+\\'", because we only want to remove
> newlines from the end of the string, and not newlines from the middle of
> the string, presumably?  ("$" means "match end of line", not "match end
> of string".)

The preceding line should probably use "\\`" as well.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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