bug#17839: 24.4.50; read-passwd echoes password input in non-interactive sessions

[Eli Zaretskii]

> From: Sebastian Wiesner <swiesner@lunaryorn.com>
> Date: Thu, 7 Aug 2014 18:08:28 +0200
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>,
>  Michael Albinus <michael.albinus@gmx.de>,
>  Andreas Schwab <schwab@suse.de>,
>  17839@debbugs.gnu.org
> 
> >> If I understand correctly, Windows support is the main issue
> > 
> > ??? No, it isn't.  Once Michael added the code to do this on Posix
> > platforms, the Windows code was added to follow suit.
> 
> I’m sorry.  I did not follow the entire discussion, since I couldn’t comment 
> on the implementation anyway.  All that I read was that there was some 
> Windows-specific discussion, and from Stefan’s comment I presumed that 
> Windows was still an issue.

The Windows-specific discussion was because implementing the same
feature on Windows had some subtle issues.

> But if it isn’t, I don’t see why this patch shouldn’t be “safe” for Emacs 24?

I guess because the code changes are not entirely trivial.