bug#1238: ido-write-file makes it easy to overwrite files unintentionally

[Chong Yidong <cyd@stupidchicken.com>]

Ryan Twitchell <metatheorem@gmail.com> writes:

> I encountered this problem independently in version 23.2.1, and think
> I have a very simple fix.
>
> As a drop in replacement for write-file, ido-write-file does not
> prompt the user for confirmation when overwriting an existing file:
>
> The function ido-file-internal uses plain old write-file to carry out
> this action:
>
> ido functions are primarily for interactive use, so it seems safe to
> pass a true value to write-file's CONFIRM arg (on the last line above)
> to always enable prompting:
>
> (write-file filename t)
>
> A quick test confirmed this change added the expected behavior.

Sounds reasonable.  I've committed a fix following your suggestion;
thanks.