bug#65049: Minor update to the repro steps

[Eli Zaretskii]

> Date: Mon, 28 Aug 2023 16:45:23 +0300
> Cc: juri@linkov.net, habamax@gmail.com, 65049@debbugs.gnu.org
> From: Dmitry Gutov <dmitry@gutov.dev>
> 
> On 28/08/2023 15:12, Eli Zaretskii wrote:
> >> Try edebug-instrumenting vc-diff-internal and then calling vc-root-diff
> >> anywhere (C-x v D). When the execution reaches the line that we have
> >> been discussing, you'll see that (vc-coding-system-for-diff (car files))
> >> evaluates to 'undecided because (car files) is a directory.
> >>
> >> So this mechanism is always unused in vc-root-diff.
> > OK, but in that case 'undecided' is the best guess we can come up
> > with.  It basically lets Emacs guess when it actually sees the stuff
> > in the diffs, while reading it into a buffer.
> 
> Yes, and if it's good enough for the (possibly?) most-frequently used 
> out of the vc-*-diff commands, then perhaps we don't need the additional 
> detection logic?
> 
> Since its introduction 30 years ago indeed the situation has changed a 
> lot, with UTF-8 and its ubiquity. Removing the extra complication would 
> make code a little easier to read, and reduce variability when 
> reproducing problems. But there's no hurry, of course.

I'm not sure I understand which part do you want to remove.