bug#65854: Multi-file replacement diff

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: me@eshelyaron.com,  65854@debbugs.gnu.org
> Date: Fri, 22 Sep 2023 19:02:33 +0300
> 
> >> +                                                    However, when the file
> >> +is not visited in a buffer, or the buffer is not modified, still read
> >> +contents from the file."
> >
> > Seems to describe an implementation detail, and I don't think it
> > should be there.  E.g., what if the file visited by the buffer no
> > longer exists?
> 
> If the file visited by the buffer no longer exists, then
> the standard error is signaled.

Which means in that case it is better to use the buffer text, no?