bug#81516: 31.0.91; delete-file-local-variable(-prop-line) should delete "Local Variables" block (prop-line)

> From: Daniel Mendler <[email protected]>
> Cc: [email protected]
> Date: Wed, 29 Jul 2026 16:02:04 +0200
> 
> Eli Zaretskii <[email protected]> writes:
> 
> >>   File mode specification error:
> >>   (error "Invalid search bound (wrong side of point)")
> >> 
> >> This suggest that the empty prop line (or the "Local Variables" block)
> >> should better be deleted.
> >
> > I cannot reproduce this error.  I created a file with file-local
> > variables, then invoked delete-file-local-variable several times until
> > all the variables were deleted and what was left was the empty block:
> >
> >   ;; Local Variables:
> >   ;; End:
> >
> > Then I saved the buffer to its file, killed Emacs, and visited the
> > file in a new session -- I saw no errors.
> >
> > If the recipe for reproducing the error is different, please describe
> > it in enough detail for me to be able to reproduce it.
> 
> The error occurs only for delete-file-local-variable-prop-line. There
> the header line ";; -*- -*-" remains which triggers the error the next
> time the file is opened.

Ok, I see that.

> I suggest to handle both deletion commands the same, remove the faulty
> prop line, and also the empty local variables block.

Why?